How much blood can I give?

Today was a big day in the life of this lab rat.  My CA125 was down, cancer was stable, so I was allowed to go on to the next two rounds of treatment.  I had blood drawn yesterday, and five or six blood draws today as I started cycle 3.  Blood draws tomorrow and thursday in the morning.  How much blood do I have and how quickly can it be replaced when I am already anemic?  I guess they, the vampires of the study world,  know our bodies can do it.  In the meantime I am relieved but exhausted, hoping for a long hot summer where I feel well enough to enjoy it.

Progress not perfection -CA125 level

Last week's blood test included CA 125 levels but the results were not in when I had chemo on Tuesday. My old bc(before cancer) self would have emailed and called the doctor and his staff to get the levels asap as I never take no for an answer and want what I want when I want it, but my dc (during cancer) self realized that nothing would change based on this level and I would get it today, and it didn't really make a difference in my life not knowing until today. So today when getting this week's blood level I was told it was down to 22.8. Definitely making progress and continuing the downward trend. It's all good.