Pre-Operative Platelet Count of 190, Now It's 75?

Her current CBC is notable for a mild anemia with a hemoglobin of 9.5 from a baseline of 10.5 and thrombocytopenia. Other labs, her kidney function, LDH, haptoglobin, bilirubin, and co-ags are all within normal limits. She has no evidence of splenomegaly or thrombosis on exam. In terms of her medications, she's on a beta blocker for AFib,. She's been taking some Tylenol for pain, heparin, and she also received some antibiotics, cetraxone, and flagell, perioperatively.