Which of the following tests cannot be performed on capillary blood?

A. Erythrocyte sedimentation rate
B. Complete blood count
C. Hemoglobin/hematocrit
D. Prothrombin time/international normalized ratio



Answer :

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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