Hematocrit ... arterial or venous blood

Discussion in 'USMLE STEP 1' started by Guest, Jun 10, 2008.

  1. Guest

    Guest Guest

    Which one do you think has higher Hematocrit ... arterial or venous blood ?


    If we review Co2 transport from tissues to venous blood: there is formation of HCO3 ion , which exits from RBC and is followed by entry of Chloride ions (aka Chloride Shift). Presence of Bicabonate and entry of Chloride ions inc the osmotic pressure of venous RBC and water follows inside RBC.
    Therefore Vol of Venous RBC > Vol of Arterial RBC
    And hence HCt of Venous blood is higher

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