Normal Serum Insulin Levels

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A serum magnesium test is a measurement of how much magnesium there is in the blood.

Alternative Names

Magnesium - blood

How the test is performed

Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.

Next, the health care provider gently inserts a...

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