Comparision of certain blood tests

Examination	What is it	What it informs about	Principle of determination
Hemoglobinometry	Concentration of Hb in blood	Transport capacity of blood for O₂	Spectrophotometry
Hematocrit	Volume fraction of erythrocytes in blood (vol%)	Blood viscosity (ie, for example: how easily blood flows through capillaries (microcirculation), how much work the heart has to pump blood)	Centrifugation
Sedimentation	The rate of decline of erythrocytes in "diluted" non-clotting blood	A non-specific marker of many diseases: Infectious Tumors Autoimmune Blood cell count (more blood cells – slower sedimentation, few blood cells – faster sedimentation) …	The effect of gravity, (and also dilution) Blood elements sediment differently according to their density The rate of sedimentation is indirectly dependent on the suspension stability of the blood

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