
Originally Posted by
austinite
Well, 50 is probably the max you want to go ever. Safe is such a loose term. 50 isn't going to kill you, but certainly the beginning stages of dangerous levels. The reason the top range is 46 is to keep you away from the dangerous levels and give you a buffer. Kind of like your car's gas tank, when the gauge reads empty, you actually still have about a gallon+ in there.
I always donate at or slightly above max range. For men, 55 is the absolute max men should reach. The limit is 51 for men. So just focus on staying in range, if you go over a couple points, no big deal, but it's time for a phlebotomy.