Hi there.
The blood counts are just employed to monitor the side effects of and your eligibility for chemotherapy.
The primary purpose of the blood counts before or anytime during the chemotherapy sessions is to check the parameters you mentioned. Your chemotherapy regimen may cause a decrease in white cell, red cell, and platelet counts, and your doctors would want to catch these side effects so that this can be treated and addressed adequately.
If your counts are unacceptably low before your planned chemotherapy, then the doctor may want to postpone the session, or give medications to elevate the counts (G-CSF for low white counts, Erythropoietin of low red counts, or thrombopoietin for low platelet counts).
After all the chemotherapy sessions are done, your blood counts would recover naturally and eventually achieve pre-chemotherapy levels.
I hope your treatments will go as uneventful as possible.
Take care and God bless.
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