When to donate blood?

Interested why they measure hemoglobin in some countries while hematocrit in others. Even though they both are related they only bother to test whichever one they prefer. Strange.

I haven't seen any CBC test having only the one of two. Also, if you know the one, you know the other as well. Hemoglobin X 3 = Hematocrit, with very very little deviation.
 
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