I suffered from Anemia back in Feb/Mar that is nasty, I couldn’t walk up or down stairs at the time, I was flagged for Haemoglobin (and it might have been Ferritin.)
I didn’t want to post about Plasma affecting RBC but as posted above that was my understanding.
Anyway as I said discuss any concerns with your Doctor. It it is a problem you’ll probably see other symptoms other than getting dropped, like extreme weakness, not able to get out of bed, dizziness etc.