After blood donation, plasma levels return within normal levels within a couple

Question

After blood donation, plasma levels return within normal levels within a couple of days. Red blood cells take approximately ~2 weeks to return to their normal levels. If an XY subject donates blood, his hematocrit will be __ 45% immediately after blood donation. ___ 45% 5 days after blood donation. __ 45% 8 weeks after blood donation.

A. less than; greater than; equal to

B. greater than; equal to; less than

C. greater than; equal to ; equal to

D. less than; less than; equal to

E. equal to; less than; equal to

Explanation / Answer

answer : B. greater than; equal to; less than

explanation:

A hematocrit is frequently done to assess the extent of significant blood loss. A hematocrit that is done immediately after a hemorrhage usually does not show the extent of RBC loss because at the time of the hemorrhage, plasma and red blood cells are lost in equal proportions. However, within several hours after hemorrhage, plasma volume increases due to a shift of interstitial fluid into the vascular space. Red blood cells, however, cannot be replaced quickly, as the bone marrow takes approximately ten days to produce mature red blood cells. As a result, a hematocrit done several hours after a bleeding episode will show a more accurate picture - thehematocrit will be decreased because the plasma volume has compensated for fluid loss while the red blood cells that have been lost cannot be replaced for days. It is important for the nurse to remember that a hematocrit value must always be interpreted in relation to the patient's hydration status and to the time the sample was drawn. When packed red blood cells are given to correct an anemia, the hematocrit should rise approximately 3% for each unit transfused

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