Q. In pathoma it's mentioned that-"Although Hb and Hct and RBC count are usually used as a surrogates for RBC mass, but in some circumstances they are not a good estimate of RBC mass". Can anybody cite some hematological disorder with brief explanation which can explain that Hb, hct and RBC count can't always be used as a good surrogate for RBC mass.What exactly is RBC mass? Is it the total no. of RBCs in circulation? Thanks.
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