Magnesium Blood Test | Magnesium Deficiency Test

Magnesium Test

This test can help determine the amount of magnesium you have in your blood. Low levels cause a magnesium deficiency (hypomagnesemia) and is more common than high levels (hypermagnesemia). Read more

Test details

Sample type:

Blood

Preparation:

Fasting is not required for this test. If you are taking vitamins, or a vitamin supplement, containing magnesium, you should consult your doctor to determine if you should stop taking them for at least one week before your sample is collected.

Test type: In Person

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$39.00

+ $6.00 Physician Service Fee

Quantity

What

This test measures the level of magnesium in your blood.

Who

Anyone who wants to assess their levels of magnesium or is having symptoms that could be related to a magnesium imbalance. Must be 18+ years of age to purchase.

How

Blood

Where

Find a location near you

Schedule an appointment, then visit one of the Quest Diagnostics Patient Service Centers.

About the Test

This test can help determine the amount of magnesium you have in your blood. Low levels cause a magnesium deficiency (hypomagnesemia) and is more common than high levels (hypermagnesemia). Magnesium is critical to maintain proper muscle and brain function. It also helps turn nutrients into energy at the cellular level. Health problems that may cause a magnesium deficiency include malnutrition, alcoholism, and diabetes.

Electrolytes are necessary for basic cell function and help the body perform and maintain important processes. Magnesium is an electrolyte responsible for proper muscle, nerve, and heart function, and helps to control blood pressure and blood sugar in the body.

When electrolytes are imbalanced, normal bodily functions are disrupted and can cause life threatening complications. By testing your magnesium levels, you and your healthcare provider may be able to better understand the cause of your symptoms and identify next steps.

Magnesium is an essential mineral needed in our bodies in large amounts. Magnesium plays an important role in keeping your heart and muscles functioning normally, regulating blood sugar levels, maintaining blood pressure, and helping your body absorb calcium. Magnesium also helps keep bones strong and regulates the immune system. Every cell in your body needs magnesium to function properly.

If you don’t eat enough magnesium-rich foods, or if your body doesn’t store or absorb enough of it, you may have low levels. Too little magnesium may cause muscle spasms or cramps, fatigue, nausea or vomiting, loss of appetite, muscle weakness, numbness, uncontrolled eye movements, or convulsions. A lack of magnesium for an extended period has been linked to high blood pressure, heart disease, diabetes, and osteoporosis.

Too much magnesium can lead to irregular heart rhythms, weak reflexes, shortness of breath and cardiac arrest.

Signs and symptoms of low magnesium include:

Weakness
Muscle cramps and/or twitching
Migraine headaches
Confusion

Signs and symptoms of high magnesium include:

Muscle weakness
Fatigue
Nausea and vomiting

If you experience these more severe symptoms, SEEK IMMEDIATE MEDICAL ATTENTION:

Trouble breathing
Irregular heartbeat
Seizures (in severe cases)
Cardiac arrest (in severe cases)

You must be 18 years of age or older to purchase a test on questhealth.com. Purchases not permitted in: AK, AZ, HI.

After you provide your specimen, it generally takes few 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. Independent physicians are available to discuss questions or concerns you may have regarding your results.

How it works

questhealth.com offers 100+ 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.

In-person
In-home sample collection

Buy a lab test & schedule an appointment

No doctor visit required for purchase. Book a visit to one of 2000+ Quest locations.

Schedule an appointment

Visit Quest for sample collection

Complete your test sample collection during your scheduled appointment.

Get fast results online

Access results online as soon as they’re available.

View results

Get physician support

Discuss your results with an independent physician at no extra cost.

Buy a lab test
+ in-home sample collection

If in-home service is available in your area, purchase for an additional $79 fee.

Buy now

Schedule an appointment

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

In-home sample collection

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

Get fast results online

Access results online as soon as they’re available. Discuss your results with an independent physician at no extra cost.

View results

In-home sample collection is not available in all locations.
Is in-home sample collection available near me?

Magnesium helps your body absorb calcium and supports your heart, muscles, bones, immune system, blood sugar, and blood pressure. Learn more about magnesium and other critical vitamins and minerals in the article here.

FAQs

What is an electrolyte?

Electrolytes are electrically charged minerals (sometimes referred to as trace elements) that are responsible for many important functions and processes in your body.

Does Quest offer a test that includes other electrolytes that are commonly evaluated with magnesium?

Magnesium levels are often tested with other electrolytes, such as sodium, calcium, potassium, and chloride. If you are interested in having these other electrolytes tested, the Comprehensive Metabolic Panel (CMP) is available for purchase.

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

Medline Plus. Magnesium Blood Test. Accessed July 10, 2023. https://medlineplus.gov/lab-tests/magnesium-blood-test/
Quest Diagnostics. Magnesium. Accessed July 10, 2023. https://testdirectory.questdiagnostics.com/test/test-detail/622/magnesium?p=r&q=magnesium&cc=PHP
National Library of Medicine: Electrolytes - StatPearls - NCBI Bookshelf (nih.gov)
National Institutes of Health. Magnesium Fact Sheet for Consumers. Accessed July 11, 2023. https://ods.od.nih.gov/factsheets/magnesium-healthprofessional/

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.

Magnesium Test