Bebefrida, it may depend on the location you're at, and it be a policy thing. They did my bloodwork on the same day I had chemo ... but I also had radiation five days a week, so I had a lot of stuff going on each day. I guess they could have had me come in on a different day to do the bloodwork, as it was all the same building, but it seemed to be easier for them to just do it all at once. It was certainly easier for me. I think they were checking white blood cell counts (though I can't recall for sure) and other things. Honestly, it's all vague right now. It's okay to ask your doctor(s) these questions, and they should give you a copy of the results each time ... if they don't, ask for one. (Then you can always ask more questions on the days you feel better.)