Magnesium is an essential mineral that acts as a cofactor in over 300 enzymatic reactions, including energy production, muscle function, and nerve signaling. It is measured in blood to assess nutritional status and evaluate symptoms like muscle weakness, cardiac arrhythmias, or metabolic abnormalities.
Magnesium is an essential mineral that acts as a cofactor in over 300 enzymatic reactions, including energy production, muscle function, and nerve signaling. It is measured in blood to assess nutritional status and evaluate symptoms like muscle weakness, cardiac arrhythmias, or metabolic abnormalities.
When elevated: Elevated magnesium (hypermagnesemia) is uncommon in healthy individuals but can occur with severe kidney disease, excessive supplementation, or certain medications. Symptoms may include muscle weakness, lethargy, or cardiac conduction abnormalities. When low: Low magnesium (hypomagnesemia) is associated with muscle cramps, weakness, cardiac arrhythmias, tremor, and personality changes. It may reflect inadequate dietary intake, gastrointestinal losses, or certain medications such as diuretics or proton-pump inhibitors.
Urine magnesium reflects dietary intake and total body stores better than serum magnesium, making it useful for assessing whether training-related losses (via sweat) or dietary gaps are depleting reserves. Low urinary magnesium may correlate with muscle cramping, delayed recovery, or suboptimal energy metabolism during intense training, though it's just one piece of the nutritional picture.
Turnaround Time
3 days
Method
Atomic absorption spectrometry (AAS) or colorimetric
Order online
Choose your lab and check out. We send your lab requisition automatically — no doctor visit needed.
Get your sample collected
Visit a lab service center near you for a quick blood draw (or book at-home phlebotomy where available).
See your results
Your results land in your Insider portal, ready to review and act on — that easy.
Your price
$30.00$55
1.8× less than retail
Versus the typical direct-to-consumer retail price for this test (illustrative — consumer prices vary by provider and region).
$30.00
Peer-reviewed sources supporting the educational content on this page.
Magnesium is an essential mineral that acts as a cofactor in over 300 enzymatic reactions, including energy production, muscle function, and nerve signaling. It is measured in blood to assess nutritional status and evaluate symptoms like muscle weakness, cardiac arrhythmias, or metabolic abnormalities.
Magnesium is an essential mineral that acts as a cofactor in over 300 enzymatic reactions, including energy production, muscle function, and nerve signaling. It is measured in blood to assess nutritional status and evaluate symptoms like muscle weakness, cardiac arrhythmias, or metabolic abnormalities.
When elevated: Elevated magnesium (hypermagnesemia) is uncommon in healthy individuals but can occur with severe kidney disease, excessive supplementation, or certain medications. Symptoms may include muscle weakness, lethargy, or cardiac conduction abnormalities.
The Magnesium, Urine test starts at $30.00 at Labcorp. No doctor's visit and no insurance needed; we do not bill insurance. Fitomics Insider members pay from $23.50.
Results for the Magnesium, Urine test are typically ready about 3 days after your draw. Your results land in your Insider portal.
No. When you order the Magnesium, Urine test from Fitomics Research Labs, a licensed physician in our 50-state network reviews and signs your requisition after checkout, and it lands in your portal and inbox. Then visit any Labcorp, Quest, or BioReference patient service center for your draw; results post to your Insider portal.
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