$2.00
Priced per marker, with baseline labs included. You’ll see your total before you pay.
Brain & nervous system
Magnesium test
Essential mineral; deficiency can cause muscle cramps, fatigue, and arrhythmia.
At a glance
In about 5 days
Most results are ready in about 5 days. Some specialty markers can take up to 21 days.
Check before your draw
This marker has no preparation tag, but it can still need preparation. Contact us before your draw if you’re not sure.
Walk in at Quest
Your lab order arrives by email. Most Quest locations take walk-ins, so bring it with a photo ID.
What it measures
Magnesium is a mineral that helps your muscles, nerves and heartbeat work and keeps your bones strong. Most of it sits in your bones and cells, so a blood level can show only part of the picture.
Why it matters for women
Migraines are much more common in women, and low magnesium may be linked to them. Magnesium also works with calcium to support your bones, which matters more as bone loss speeds up around menopause.
You might check it if…
- you get muscle cramps, twitches or a fluttering heartbeat
- you get frequent migraines
- you’ve taken heartburn medicine or water pills for a long time
- you live with ongoing diarrhea or a gut condition like celiac disease
What your result may mean
High Magnesium: what it may mean
High magnesium (hypermagnesemia) can result from supplements, overuse of magnesium antacids or laxatives, kidney failure or adrenal insufficiency. Magnesium given through an IV for preeclampsia in pregnancy can also raise it. Mild rises may cause no symptoms, while larger rises can bring nausea, flushing, muscle weakness, drowsiness or a slow heartbeat. A clinician may check your kidney function and ask about supplements and anything you take for constipation or sleep.
Low Magnesium: what it may mean
Low magnesium (hypomagnesemia) can happen with proton pump inhibitors, alcohol, water pills (diuretics), vomiting or diarrhea, or poor intake. Most magnesium sits in your bones and cells, so a blood test can miss a shortage. You may notice muscle cramps, tiredness or an irregular heartbeat (arrhythmia), or no symptoms at all. Low magnesium may be linked to migraines, which are more common in women, and it may come up with PMS, pregnancy and menopause. It can also pull down potassium and calcium, so a clinician may check those too.
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These notes provide context and do not diagnose a condition. Not yet available in NY, NJ, RI, HI, ND, SD or WV.