Low Hemoglobin Cause

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Serum hemoglobin is a test that measures the level of free hemoglobin in the liquid part of the blood (the serum). Free hemoglobin is the hemoglobin outside of the red blood cells. Most of the hemoglobin is found inside the red blood cells, not in the serum.

Alternative Names

Blood hemoglobin; Serum hemoglobin

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...

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