Magnesium, Blood Serum Test
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- 4,500+ CLIA-certified labsNo appointment needed for most tests
- Physician-orderedNo doctor’s visit or referral needed
- Secure and confidentialNot billed to insurance
- Most results in 1–3 daysIn your secure online account
- HSA/FSA cards acceptedItemized receipt available
Price $28 Compare at $56
You save $28 · 50% off
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How to prepare No fasting needed
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Get this test plus more in one lab visit.
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About this test
This test evaluates the level of magnesium in the blood's serum for deficiency or toxicity.
Magnesium is a mineral that plays an important role in many biochemical reactions including your heartbeat, nerve and muscle function, bone development, energy production, glucose and blood pressure regulation and protein synthesis.
The Magnesium Serum Test is often used to monitor individuals with kidney disorders or disease, or to evaluate individuals with symptoms of malnutrition or malabsorption.
Deficient magnesium levels can lead to:
- Muscle cramps/spasms/tremors
- Fatigue/Somnolence
- Decreased reflexes
- Heart block
- Inexplicably low calcium levels
- Nausea
- Loss of appetite
- Seizures
- Heart arrhythmia
- Diarrhea
Magnesium levels that are high can be a sign of:
- Renal (kidney) failure
- Ingesting large amount of antacids
- Addison disease
- Pregnant patients with pre-eclampsia or eclampsia on anticonvulsant drugs
Magnesium deficiency can be more prevalent in people who:
- Drink caffeinated drinks or alcohol often
- Have malabsorption of vitamin D, which aids in magnesium absorption
- Are uncontrolled diabetics
- Eat a lot of refined sugar, which causes the body to excrete magnesium through the kidneys
- Have Bartter syndrome or Gitelman syndrome
- Are on corticosteroids
Major dietary magnesium sources include:
- Leafy green vegetables like spinach
- Squash
- Pumpkin seeds
- Nuts and seeds
- Legumes
- Fish
- Whole grains
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- TodayOrder online No doctor’s referral or insurance needed. Our physicians provide the lab order.
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HealthLabs.com vs. going through your doctor
| Feature | HealthLabs.com | Through your doctor |
|---|---|---|
| Referral needed | No, our physicians provide the order | Usually requires a visit first |
| Appointment | Walk in for most tests | Book, then wait for a visit |
| Insurance | Not needed | Co-pays and deductibles may apply |
| Price known upfront | Yes, listed next to every test | Often not until you're billed |
| Choose your own tests | Yes, from our full test menu | Your doctor decides |
| Getting results | Online, most in 1–3 business days | Often shared at a follow-up |
Magnesium, Blood Serum Test
No doctor's visit needed · HSA/FSA cards accepted · 110% price guarantee
Price $28 Compare at $56 You save $28 · 50% off