• Magnesium, RBC
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Magnesium

Magnesium

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The Magnesium, RBC test measures the level of magnesium in your red blood cells, providing a more accurate picture of your magnesium status compared to serum magnesium levels. Magnesium is vital for various bodily functions, including muscle and nerve function, blood pressure regulation, and bone health. This test is important for individuals experiencing symptoms related to magnesium deficiency, such as muscle cramps or fatigue. Understanding your magnesium levels can help inform dietary choices and supplementation to support overall health.

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About This Test

Reason to Check It

"Magnesium is a mineral that is important for nearly all chemical processes in the body, including reactions that produce energy. Magnesium is plentiful in nuts, coffee, bananas, avocados, legumes, tea and leafy green vegetables. About half of the body's magnesium is found in bone. The other half is found inside cells of body tissues and organs.

Magnesium helps maintain normal muscle and nerve function, and keeps the bones strong. Magnesium is also needed for the heart to function normally and to help regulate blood pressure. Magnesium also helps the body control blood sugar level and helps support the body's defense (immune) system.

Magnesium deficiency is relatively common and symptoms include irritability, abnormal functioning of the nerves and muscles, heart damage and kidney damage. High levels of magnesium can also have health consequences. Symptoms of elevated magnesium include decreased muscle tone, fatigue, drowsiness and lethargy." - Dr. Alan Hopkins

Test Preparation

  • Fasting (Overnight) required for 10-12 hours


Please Note: We recommend overnight fasting and an early morning blood draw for all tests, even if no special preparation is required. Remember, it is OK to drink plenty of water. Drinking water helps hydrate you and makes it easier for the phlebotomist to obtain your blood sample.

Test Type and Method

Test Type:

  • Blood


Test Method:

  • In-person Blood Draw

Post-Test Notes

  • Once your specimen is collected, test results are typically processed and available within a few business days. Processing times may vary depending on the test. Your results will be delivered in a clear, easy-to-understand report. If any values fall outside the expected range, you may receive a follow-up call from an independent healthcare coordinator.

Lab Testing is Simple, Fast, and Convenient

Choose the Individual Test or Lab Panel that suits your health needs. You’ll receive your lab requisition within 24 hours. Visit any of the 3,000+ Quest Diagnostics centers using the button below. Once your sample is collected, your results will be securely delivered via email within 7–10 days.

View Quest Draw Locations

Lab Testing is Simple, Fast, and Convenient

Choose the Individual Test or Lab Panel that suits your health needs. You’ll receive your lab requisition within 24 hours. Visit any of the 3,000+ Quest Diagnostics centers using the button below. Once your sample is collected, your results will be securely delivered via email within 7–10 days.

View Quest Draw Locations