Magnesium test
The magnesium in your blood, only a small part of your body’s total.
€4.70. You pay at the desk, not online.
- Preparation: No fasting needed on its own
- Prescription: Not needed
- Results: In the Rosa app, within 10 working days
- Also called: Magnesio, Mg, magnesemia
Magnesium test: what it is for
Blood magnesium is the amount of magnesium in your blood. Magnesium keeps your muscles, nerves and heart working, but your blood holds only about one percent of your body’s total. That is why a normal result does not rule out a shortage.
Why it is done
Almost all of it sits in your bones and inside your cells. Your blood holds little, and keeps it steady by drawing on your stores.
That makes it a weak but useful signal: if it is low, your stores are usually low too. And a low magnesium can keep potassium and calcium low as well.
How the magnesium test is done
It is a blood test, done at a Bianalisi lab without a prescription. You can add other tests to the same draw.
Questions about the magnesium test.
Do I need to fast for a magnesium test? Not for magnesium, usually. It is done with other tests that do need fasting, though, so it is best to arrive fasted. If you take magnesium supplements, tell your doctor.
How much does the magnesium test cost? €4.70, from Bianalisi’s private list for Lombardy. You pay at the desk on the day of the draw, not online.
Do I need a prescription for the magnesium test? No. You book it here without a prescription and pay at the Bianalisi desk.
When do results arrive? Within 10 working days, in the Rosa app, with each value next to the lab’s interval. The report a doctor approves is in the Rosa membership.
