What does platelets 5.21 indicate?

blood clotting

This could indicate several things, from infection to leukemia. You should see a doctor to have more tests done.

Platelets or Thrombocytes circulate in the blood of mammals and are involved in hemostasis, leading to the formation of blood clots.

a platelet is something your body makes. lets say you have a small cut then the platelets would start to go out of that cut and turn the blood into a scab to stop the bleeding

Your entire platelet population turns over in 7-10 days at most. Benadryl half life is less than 8hours, so nearly ALL benadryl will be out of your system within 48 hrs. When all the Benadryl is...