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Retired NBME 25 Answers

nbme25/Block 2/Question#2 (reveal difficulty score)
A woman who weighs 70kg (154 Lbs) is ...
5 L ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—shak360(19)
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Total blood volume can be calculated by the following equation:

Total blood volume = Erythrocyte stuff + Plasma stuff

TBV = hematocrit% * TBV + plasma% * TBV

(where hematocrit% + plasma% = 100%)

TBV = hematocrit% * TBV + plasma volume

and in this question

TBV = 0.4*TBV + 3L

0.6*TBV = 3L

TBV = 5 L

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