will donating a regular amount of blood still lower hematocrit even if not a double red. I made an appt in two hours from now and all they had was a single donation, not double red donation so I took it seeing how i don't know when I can go again due to work. I also don't know my blood type. Reason I ask is I had a thread a few weeks back posting blood results and had an 18.4 hematocrit. I dropped my dose to 180 mgs a week but would also like to drop levels even lower by donating. Thanks in advance guys.