Final answer:
Hematocrit measures red blood cell percentage in a blood sample, which is not suitable for capillary blood. Various blood tests have specific blood sample requirements, such as venous blood for certain tests. Packed cell volume is a significant indicator of the volume of red blood cells in blood samples.
Explanation:
Hematocrit is a test that measures the percentage of red blood cells in a blood sample by centrifugation, separating it from plasma and other formed elements.
Capillary blood is typically used for tests like complete blood count and hemoglobin/hematocrit, but not for tests like erythrocyte sedimentation rate or prothrombin time/international normalized ratio, which require venous blood.
PCV, or packed cell volume, refers to the volume of erythrocytes in the blood after centrifugation, with normal values around 45% in adults.
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