The Nurse Administers Heparin 5,000 Units Subcutaneously at 2100 and Documents

The nurse administers heparin 5,000 units subcutaneously at 2100 and documents in the medication administration record (MAR) that the dose was administered.What other information is important for the nurse to document?

A) Injection site
B) Previous site of administration
C) Patient response to medication
D) Heart rate prior to administration