Fitness Profile — Nutrition

Fitness Profile — Nutrition Test

Fuel your overall health, fitness and performance with deeper insight into your nutritional status. This fitness-focused blood panel measures 65+ markers tied to overall health, fitness readiness, hydration, and key nutrition and fatty acid levels – important factors that influence energy, stamina, and how your body supports physical activity. Whether you’re dialing in your nutrition, supporting a training routine, or looking to understand what may be limiting performance; these results help you make more informed decisions about fueling your body to support health and fitness goals. Read more

Test details

Sample type:

Blood

Preparation:

Fasting (not eating or drinking anything except water) for 8-12 hours is recommended. Certain supplements and medications can interfere with your test results. If you are concerned about any of your supplements or medications impacting your results, talk to your healthcare provider before your sample is collected to see if you should stop taking them and for how long.

Test type: In Person

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$288.00 ~~$360.00~~

+ $6.00 Physician Service Fee

Quantity

What

The Fitness Profile – Nutrition helps the fitness-minded person evaluate their nutrition. This panel also includes a collection of key physical measurements and a Health Risk Assessment.

Who

Must be 18+ years of age to purchase.

How

Blood

Where

Find a location near you

Schedule an appointment, then visit a Quest Diagnostics patient service center location.

About the test

The Fitness Profile – Nutrition Test is a comprehensive blood panel designed for individuals who want to gain a snapshot of overall health and understand how their nutritional decisions are supporting their overall health, fitness readiness, and performance. It measures 65+ markers across overall health, metabolic function, hydration, stress response, and key nutritional and fatty acid levels—core factors that influence energy, stamina, and how your body supports physical activity.

It includes a comprehensive metabolic panel (CMP), cholesterol (lipid) panel, glucose, cortisol, electrolytes, serum osmolality, along with a broad set of nutrition markers. These include vitamins D, B12, B9 (folate), beta-carotene (vitamin A precursor), vitamin E, plus iron and ferritin, and the Quest OmegaCheck® panel, which evaluates omega-3 and omega-6 fatty acids, including EPA, DHA, and arachidonic acid, as well as relevant fatty acid ratios.

Together, these markers provide insight into general health, heart health, metabolic readiness, hydration and electrolyte balance, stress response, vitamin and mineral status, iron stores, and fatty acid balance. Understanding these results can help identify potential nutritional gaps or imbalances that may affect energy levels, stamina, and overall fitness support.

In addition to the 50+ biomarkers outlined above and detailed in the What’s tested section, this offering includes a biometric screening (physical measurements) and a Health Risk Assessment survey, which help generate a personalized Health Quotient Score. This score can be used to help you understand and track your individual health and fitness goals over time.

This test may be useful whether you’re refining your nutrition approach, supporting an active lifestyle, or looking for greater clarity around how diet may be influencing your fitness and overall health. You’ll have the ability to discuss your results with an independent healthcare provider at no additional cost. They can help interpret findings in the context of your health history, dietary patterns, activity level, and goals. We also encourage you to share your results with your regular physician.

No doctor’s visit needed. Buy this fitness nutrition blood test and visit a nearby Quest location.

If you want deeper insight into your overall health and how nutrition and fatty acids are supporting your fitness and overall health, this test may be right for you. It’s designed to help you understand key nutritional, metabolic, hydration, and stress-related factors that influence energy, stamina, and how your body supports physical activity.

You might consider this test if you:

Want a nutrition-focused health and fitness snapshot tied to overall health, fitness readiness, hydration, stress response, and key nutritional and fatty acid levels
Are dialing in your nutrition or supplement strategy to better support training or an active lifestyle
Want insight into vitamin, iron, and fatty acid status that may influence energy, stamina, and ability to be consistent
Are interested in understanding omega-3 and omega-6 fatty acid balance as part of overall fitness and nutrition support
Want a practical way to establish and track nutrition-related health indicators over time.

Quest offers 3 options for fitness profile test panels–Basic, Elite, and Nutrition–depending on your focus and the breadth of health insights you are most interested in.

Fitness Profile — Basic Test is ideal if you want a clear baseline view of your overall health and fitness readiness, including metabolic health, hydration, stress response, and vitamin D, to support both routine fitness and day to day energy
Fitness Profile — Elite Test is designed for those who want a comprehensive view of fitness and performance, with expanded insight into recovery, inflammation, hormones, hydration, and nutrient status to support higher training demands and performance goals
Fitness Profile — Nutrition Test (this test) is a good fit if your primary focus is fueling performance, with deeper insights into vitamin, iron, and fatty acid levels – helping you understand how nutrition and diet may be supporting energy, stamina, overall health, and an active lifestyle

This Fitness Profile – Nutrition Test contains tests and test panels within many key areas important to fitness and performance. In addition to providing the metrics, the results report will provide insights into why some of the standard metrics in base panels such as our CMP may be particularly relevant to athletes and any individuals looking to optimize fitness and performance.

Core health and metabolic readiness

The comprehensive metabolic panel (CMP) helps assess overall health, detect early signs of disease, and monitor chronic conditions. It measures 14 components: blood sugar (glucose), calcium, total protein, liver enzymes, bilirubin, blood urea nitrogen, creatinine, albumin, carbon dioxide, and key electrolytes. Abnormal CMP test results may indicate various health conditions, such as developing or active liver or kidney disease, hypertension, or diabetes and may result in additional tests being run on your existing sample, at no extra cost to you. Several metrics within your CMP including BUN and creatinine are liver and muscle waste products, so abnormal levels may indicate recovery strain.

This lipid panel (or lipid profile) blood test measures your cholesterol and triglycerides levels to assess your risk for cardiovascular diseases. The lipid profile test works by measuring total cholesterol, triglycerides, HDL, LDL, cholesterol/HDL ratio, and non-HDL. Regular lipid panel testing plays a key role in maintaining both general and cardiovascular health.

As part of the CMP, your blood glucose is measured. This is the primary sugar found in your bloodstream. The sugar mainly comes from the food you eat and supplies energy to all cells in the body. High glucose levels may increase the risk of diabetes and associated disorders, such as heart disease.

At the time of your appointment, physical measurements such as your height, weight, waist size, and blood pressure are taken to provide you with additional health-related information.

Along with the biometric screening we provide you a health risk assessment, which is a brief survey that will capture family health history and current health and wellness behaviors. Combined with your diagnostic test results, these metrics will provide you with a personalized Health Quotient Score. The Health Quotient Score, developed by Quest, is a numerical representation of your health on a scale from 1 to 100. This score is unique to you and factors in select lab test results, a health risk assessment, and biometric screening. The higher your score, the better your health. You can use this number as your baseline, then develop a plan to improve your health and track your progress over time.

As a result of the health risk assessment, biometric screening and other results, you will receive risk scoring (each rated high, medium, or low) for 12 risk areas as well as a score for your metabolic syndrome risk.

Hydration and electrolyte balance

Serum osmolality is a blood test to help individuals engaged in particularly high intensity training monitor the body's water balance. Osmolality is a measure of how concentrated a fluid is. In other words, it is a measure of the concentration of all chemical particles found in the fluid (serum) portion of blood. Low blood levels may indicate overhydration, while high levels may indicate dehydration.

As part of your CMP, calcium is measured. Calcium is one of the most abundant minerals in the human body and plays a key role in multiple bodily functions. Most of the calcium in your body is stored in your bones, with only 1% circulating in your bloodstream. Calcium is required for strong bones and teeth and proper nerve, muscle, and heart function.

As part of your CMP, sodium is measured. Sodium is a vital mineral in the body. It is carefully regulated by the kidneys and plays an important role in the body's water balance. Sodium is an electrolyte, which means it is a mineral with an electrical charge. Electrolytes affect how much water is in your body and how your muscles work. During exercise, sodium is the major electrolyte lost through sweat and the most important one to replace after exercise. Because sodium is essential for muscle and nerve function and hydration, it is critical to monitor and manage sodium levels in the body. Out-of-range levels may decrease muscle power and motor control during performance or cause muscle cramping.

As part of your CMP, potassium is measured. Potassium is an electrolyte that is also one of the body's most important minerals. It helps to regulate water balance, blood pressure, and heart rate. Potassium is also necessary for muscle contraction and nerve function. Monitoring and regulating potassium levels in the body is critically important, as potassium is essential to muscle and nerve function and hydration. Out-of-range levels may decrease muscle power and motor control during performance or lead to muscle cramping.

As part of your CMP, chloride is measured. Chloride is an electrolyte that helps to balance fluids inside and outside of your body's cells. Chloride plays an essential role in metabolism and is instrumental in maintaining proper blood volume, blood pressure, hydration fluid balance, muscle response, and acid/base balance. Blood chloride can be elevated when the body loses excessive amounts of sodium- chloride in the body through high rates of fluid loss. If the body is inadequately hydrated, the athlete may not be able to perform optimally.

Nutritional status and oxygen delivery (performance fuel)

This test measures the amount of 25-hydroxyvitamin D in your bloodstream, an indicator for the level of vitamin D in your body. Vitamin D is involved in regulating calcium and phosphorus, which are essential nutrients to promote bone strength and cellular health. Vitamin D can also help the immune system fight infections and is known to be involved in muscle function and protein production. Your body produces vitamin D after exposure to sunlight or from consuming certain foods and supplements.

Vitamin B12 (also known as cobalamin) is an essential nutrient necessary for producing and maintaining nerve and red blood cells, supporting the nervous system, and helping to create DNA, the basis of all cells. Optimal vitamin B12 status is important to support metabolism, red blood cell production, and nerve function. Vitamin B12 must be supplied by the diet or through supplementation because the body is not able to produce it on its own.

Folate, also known as vitamin B9, is required for red and white blood cell development, tissue growth, cell function, DNA production, and the breakdown, usage, and creation of proteins. The term folate is often used to describe the naturally occurring form, while folic acid refers to the supplement form added to foods. Because folate is linked to red blood cell function, deficiencies in folate can lead to decreased endurance and fatigue.

Carotene is a substance in foods that serves as a precursor to the active form of vitamin A in the body. It also functions as an antioxidant, which helps to protect cells from damage. In foods, it is the pigment in carrots, pumpkins, sweet potatoes, cantaloupe, mangoes, and papaya that colors them orange.

Vitamin E, also known as tocopherol, is a fat-soluble (dissolves in fat) vitamin that has several important functions in the body. It acts as an antioxidant, helping to protect cells from damage caused by free radicals (unstable molecules). This can be particularly beneficial for athletes, who are exposed to oxidative stress due to their high level of physical activity. Oxidative stress occurs when the number of free radicals and antioxidants are out of balance. Vitamin E also helps boost the immune system, replenish red blood cells, heal wounds, reduce inflammation, and prevent blood clots from forming inside blood vessels. There are several types of vitamin E, each with varying biological activity and antioxidant capacity. Alpha-tocopherol (α-tocopherol) is the most biologically active form of this vitamin and is the only one utilized by the human body. Although other tocopherols are absorbed and serve various roles, the human body does not convert them into alpha-tocopherol for usage. Alpha-tocopherol is found in plant oils, nuts, seeds, and leafy green vegetables, and it is frequently used in vitamin supplements. This test measures the levels of alpha-tocopherol and beta-gamma-tocopherol in the bloodstream.

Ferritin is a protein in the blood that contains iron and helps you understand how much iron your body is storing. Blood levels of ferritin correlate to the body's iron status. Because iron is an important component of oxygen-carrying hemoglobin in the blood, low ferritin levels may result in suboptimal physical performance and endurance.

Iron is an essential micronutrient in the body. In the body it plays an important role in the production of healthy red blood cells. It also is a key component of proteins such as hemoglobin (the protein in red blood cells that carry oxygen), myoglobin (the protein in muscle that binds to oxygen), and enzymes (proteins that enable metabolic processes to occur). Iron is needed for proper growth and development. Iron must be supplied by the diet or through supplementation because the body is not able to produce it on its own.

The Omega-3 & 6 Ratio Test (OmegaCheck®) measures the total levels of omega-3 and omega-6 fatty acids in your blood as well as three additional measurements/ratios: EPA+DHA+DPA, AA:EPA, and omega-6:omega-3 ratio.

Omega-3 fatty acids
Omega-3 fatty acids are also known as essential (your body can’t produce them itself) polyunsaturated fatty acids (PUFAs). Omega-3 fatty acids are involved in many body processes, including blood clotting, muscle function, and cell division and growth—all of which affect heart health. Too little omega-3 can lead to dry skin, an itchy rash, dry eyes, inflammation, joint pain, or depression. Omega-3 PUFAs include eicosatetraenoic acid (EPA), docosahexaenoic acid (DHA), and docosapentaenoic acid (DPA). Our bodies cannot make omega-3 fats so we must get them from food or supplements. EPA and DHA are naturally found in fish oil and fatty fish like salmon, mackerel, herring, and tuna. ALA is an additional omega-3 fatty acids that is naturally found in plant-based foods like green leafy vegetables (kale, and spinach), soybeans, seeds, flaxseed oil, nuts, and vegetable oils.
Omega-6 fatty acids
Omega-6 fatty acids are essential polyunsaturated fatty acids (PUFAs). Omega-6 fatty acids have important roles in brain function, skin health, blood clotting, cell health, and growth and development. Too little omega-6 can lead to dry skin, an itchy rash, dry eyes, inflammation, joint pain, or depression. Omega-6 PFUAs include linoleic acid (LA) and arachidonic acid (AA). Our bodies cannot make omega-6 fats, so we must get them from food or supplements. Omega-6 is naturally found in walnuts, tofu, peanut butter, sunflower seeds, and safflower oil.
EPA + DPA + DHA
This measurement may show the body’s intake and storage of EPA, DPA and DHA. A higher percentage suggests optimal levels that are seen with reduced risks of chronic diseases, while a lower percentage may mean there is a need for increased dietary intake or supplementation.^1,2
Arachidonic acid/EPA ratio
The AA/EPA ratio is a valuable predictor of cardiovascular risk. A higher ratio is associated with higher risk for major cardiac-related diseases and issues.^3,4,5
Omega-6/Omega-3 ratio
The Omega-6 to Omega-3 ratio helps determine if there is a proper balance between these two types of fatty acids to ensure optimal health outcomes.^6,7

Mercury is an environmental heavy metal that may, when elevated, increase oxidative stress and inflammation, disrupt energy production, affect how your muscles and nerves work together, and contribute to fatigue and slower recovery. The type of mercury measured in this test (organic mercury, via blood) is most commonly linked to dietary sources, especially fish and seafood, as well as some supplements that may contain trace heavy metals.

Purchaser: You must be 18 years of age or older to purchase a test on questhealth.com.

Patient: This test can be performed on patients between 18 and 100 years old.

Sample collection: This test requires sample collection at a Quest Diagnostics location or through Quest Mobile^TM where available, a convenient option for in-home sample collection*. Collection is not available in AK, AZ, or HI.

*Check your zip code here for service availability, not available in all locations. Quest Mobile is currently only available for individuals ages 18+.

After you provide your specimen, it generally takes up to 8 business days to process and release your test results. However, processing times may vary. Your test results will be available in a clear and easy-to-read report. If you have or create a MyQuest® account, you may be able to review your new results there with your other Quest results. If your results differ from expected ranges, you may receive an alert call from an independent healthcare coordinator. Independent healthcare providers are available to discuss questions or concerns you may have regarding your results.

Compare products

Test For	Fitness Profile — Nutrition Test	Fitness Profile — Basic Test	Fitness Profile — Elite Test
Comprehensive metabolic panel (CMP)
Complete blood count (CBC)
Cholesterol panel
Glucose
Health Quotient Score
Health risk assessment
Physical measurements (Biometrics)
Cortisol
hs-CRP
Interleukin-6
Immunoglobulin A (IgA)
Mercury
Testosterone, Total
Estradiol (Estrogen)
Creatine kinase
Lactate dehydrogenase
Electrolytes: calcium, sodium, potassium, chloride
Serum osmolality
Vitamin D
Vitamin B12 & B9 (Folate)
Carotene (Vitamin A precursor)
Vitamin E
Ferritin & Iron
Transferrin
Omega-3 & 6 panel including EPA, AA, DHA, & Ratios
	$288.00 ~~$360.00~~	$196.00 ~~$245.00~~ Learn More	$400.00 ~~$500.00~~ Learn More

Fitness Profile — Nutrition Test	Fitness Profile — Basic Test	Fitness Profile — Elite Test
Comprehensive metabolic panel (CMP)
Complete blood count (CBC)
Cholesterol panel
Glucose
Health Quotient Score
Health risk assessment
Physical measurements (Biometrics)
Cortisol
hs-CRP
Interleukin-6
Immunoglobulin A (IgA)
Mercury
Testosterone, Total
Estradiol (Estrogen)
Creatine kinase
Lactate dehydrogenase
Electrolytes: calcium, sodium, potassium, chloride
Serum osmolality
Vitamin D
Vitamin B12 & B9 (Folate)
Carotene (Vitamin A precursor)
Vitamin E
Ferritin & Iron
Transferrin
Omega-3 & 6 panel including EPA, AA, DHA, & Ratios
$288.00 ~~$360.00~~	$196.00 ~~$245.00~~ Learn More	$400.00 ~~$500.00~~ Learn More

How it works

questhealth.com offers 150+ consumer-initiated Quest Diagnostics lab tests to empower you to have more control over your health journey. Choose from a variety of test types that best suit your needs.

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Book a visit to one of 2000+ Quest locations.

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Complete your test sample collection during your scheduled appointment.

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Access results online as soon as they’re available. You will be emailed when they are ready. Discuss your results with an independent healthcare provider at no extra cost. Treatment options may be available.

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After you make a purchase, register your test and Quest Mobile will contact you to schedule an in-home sample collection appointment.

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A Quest Mobile phlebotomist will collect your sample and deliver it to Quest Diagnostics.

Get fast results

Please note: Quest Mobile is currently only available for individuals ages 18+.

FAQs

How does muscle affect eGFR?

Athletes may have eGFR outside of the range of normal values due to large amounts of muscle mass and muscle metabolism. In this situation, the effect is unlikely to be kidney dysfunction, but rather a larger demand on the kidneys because of high metabolic output. eGFR results can be monitored to ensure the kidneys are functioning appropriately to filter waste products from the blood.

What does it mean if my white blood cell count is out-of-range?

A low white blood cell count, also called leukopenia, may mean your body cannot fight off infection, and an excessive white blood cell count (leukocytosis) may indicate an infection or inflammation. Additionally, white blood cells are a component of the immune system and are classified into subtypes called neutrophils, monocytes, lymphocytes, eosinophils, and basophils. If the neutrophil count is high, this may be indicative of an acute infection, stress, muscle damage, rheumatoid arthritis, or other inflammatory disorders.

If the neutrophil count is low, it may be the result of a bacterial infection or medical condition. A consistently low neutrophil count, in the absence of disease, may be a sign of overtraining.

Monocytes can be elevated because of an infection, inflammation, allergic reaction, or asthma. During exercise, the number of monocytes in circulation increases. However, the number of monocytes in circulation normally returns to resting levels when exercise stops. Athletes, especially endurance and female athletes, may normally have lower monocyte counts than the range of normal results (called the reference range). This is often considered an adaptation to training.

An elevated lymphocyte count may mean an infection or other immune challenge. If the lymphocyte count is low, it may be the result of a medical condition. A low lymphocyte count may also occur from undernutrition, stress, use of corticosteroids (such as prednisone), or high exercise volumes.

If the eosinophil count is high, it could be the result of an infection, allergic reaction, eczema, or asthma. Certain medical conditions such as autoimmune diseases, hay fever, or leukemia are also associated with elevated eosinophil counts. If the eosinophil count is low, it may be the result of high levels of cortisol in the body or alcohol intoxication.

When the number of basophils, like eosinophils, climbs too high, they can contribute to allergies and other inflammatory reactions in the body. A low basophil count may indicate that the athlete is unlikely to be experiencing an allergic response and this is generally not a cause for concern.

I thought triglycerides were harmful, so why do they matter for athletic performance?

In medicine, triglycerides are used to monitor for conditions like diabetes or coronary artery disease. However, triglycerides can provide an important fuel during exercise. Triglycerides are a type of fat found in the blood. When you eat, your body converts any calories it doesn't need to use right away into triglycerides. The triglycerides are then stored in your fat cells. Later, when your body needs energy, hormones release the triglycerides into your blood so they can be used for fuel. This process is known as lipolysis.

People who exercise frequently tend to have lower levels of triglycerides in their blood because their bodies use more triglycerides for energy during exercise. Distance runners and other endurance athletes usually have the lowest levels of triglycerides because they use the most energy during exercise. Triglycerides are an important source of energy for athletes, helping them to maintain their performance during exercise.

Does hypothyroidism or hyperthyroidism affect athletic performance?

The primary role of thyroid hormones is to regulate metabolic rate, and improper function of the thyroid gland could lead to significant decreases in athletic performance.

If thyroid stimulating hormones, or TSH, is high, the thyroid gland is likely not producing enough thyroid hormones or working as it should. Underactive thyroid function can affect energy levels, growth, mood, and performance. Because of fatigue, hypothyroidism can make it difficult to exercise, and your capacity to train as an athlete is significantly reduced.

When the TSH level is low, it means that the thyroid gland is overactive and producing high amounts of thyroid hormones. An overactive thyroid may make maintaining muscle mass difficult. The oversecretion of thyroid hormones can have a catabolic effect on skeletal muscle tissue.

Importantly, athletes can maintain healthy thyroid hormone levels and avoid these complications with proper diagnosis and treatment.

What is the relationship between potassium and sodium?

The electrolytes potassium and sodium work in tandem to help maintain fluid balance and blood volume, nerve and muscle growth, heart function, and pH balance in the body. Your cells use potassium alongside sodium, and both are essential for cell function. There is a mutual trade-off between sodium and potassium to maintain balance within the body. An ion exchange occurs when sodium or potassium enters a cell. When sodium enters the cell, potassium leaves, and when potassium enters the cell, sodium leaves.

Aren't iron deficiency and iron deficiency anemia the same?

No, there is a difference between the terms, though they sometimes seem to be used interchangeably. Anemia is caused by insufficient levels of hemoglobin, whereas a lack of iron causes iron deficiency.

It's possible to have an iron deficiency while maintaining a normal hemoglobin level. However, a person with iron deficiency anemia has neither sufficient levels of hemoglobin nor iron. It's important to note that anemia can also be caused by issues other than iron imbalance, such as blood loss, inflammation, and certain health conditions.

What next steps should I take if I have an abnormal result?

You should share your results with a healthcare provider who can review your medical history and lab tests and together you can make a plan going forward that is right for you.

Can I use my FSA or HSA funds to purchase tests at questhealth.com?

You may be able to use your FSA or HSA funds to purchase lab tests at questhealth.com. Please review your FSA/HSA plan or check with a tax professional to confirm specific requirements for individual eligibility.

Our references

These tests, as a group of markers, are intended to provide health, fitness, and performance insights to empower individuals to achieve optimal lifestyle health (exercise, nutrition, recovery, hydration, stress management). These tests are not intended to be a replacement for routine medical monitoring. Individuals taking in these tests are encouraged to seek professional medical assistance regarding the medical implications of any test results.

National Institutes of Health. Omega-3 Fatty Acids - Health Professional Fact Sheet. Accessed July 22, 2024. https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional/
Quest Diagnotics. OmegaCheck. Accessed July 22, 2024. https://testdirectory.questdiagnostics.com/test/test-guides/TS_OmegaCheck/omegacheck?p=td
Itakura H, Yokoyama M, Matsuzaki M, et al. Relationships between plasma fatty acid composition and coronary artery disease. J Atheroscler Thromb. 2011;18:99-107. doi:10.5551/jat.5876
Nelson JR, Raskin S. The eicosapentaenoic acid:arachidonic acid ratio and its clinical utility in cardiovascular disease. Postgrad Med. 2019 May;131(4):268-277. doi: 10.1080/00325481.2019.1607414. Epub 2019 May 7. PMID: 31063407.
Wan JB , Huang LL ,Rong R , et al. Endogenously decreasing tissue n-6/n-3 fatty acid ratio reduces atherosclerotic lesions in apolipoprotein E-deficient mice by inhibiting systemic and vascular inflammation. Arterioscler Thromb Vasc Biol.
Simopoulos AP. The importance of the ratio of omega-6/omega-3 essential fatty acids. Biomed Pharmacother. 2002 Oct;56(8):365-79. doi: 10.1016/s0753-3322(02)00253-6. PMID: 12442909.
Dyall SC. Long-chain omega-3 fatty acids and the brain: a review of the independent and shared effects of EPA, DPA and DHA. Front Aging Neurosci. 2015 Apr 21;7:52. doi: 10.3389/fnagi.2015.00052. PMID: 25954194; PMCID: PMC4404917.
Skypala IJ, McKenzie R. Nutritional issues in food allergy. Clin Rev Allergy Immunol. 2019;57(2):166-178. doi:10.1007/s12016-018-8688-x

Tests purchased on questhealth.com are only for individuals who intend to pay directly for testing and do not want to submit a claim for reimbursement under their health insurance.