Doc, how soon after donating blood can a person:
1) donate blood again, and,
2) go diving?
SeaDemon,
I don't know why on earth would a individual be so eager to go diving after donating blood. I mean, i myself almost felt sleepy and dizzy for 6 hours after donating blood last week.
However, one can donate blood again after 3 MONTHS of donating blood previously (this, according to Pusat Darah Negara). Our body replaces the the lost red blood cells completely after 2 months. Due to the reduced oxygen-carrying capacity of the haemoglobin in the red blood cells immediately after donating blood, one may (or may not!!) get drowsy and sleepy...
As for diving, if one is not anemic after donating blood,and has a normal hematocrit, one can go diving 24 hours after donating blood...