A medical test measuring the percentage of red blood cells in total blood volume, crucial for diagnosing anemia and other blood disorders.
From Greek haema (blood) + krino (to separate/judge). Emerged as a standard medical test in early 20th century.
Your haematocrit is measured every time you get basic blood work—it's literally the percentage of your blood that's red cells versus plasma, and it's one of the simplest ways doctors spot if you're anemic or have other blood problems.
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