The Primary Care NP Administers Penicillin G (Bicillin)to a 75-Year-Old

The primary care NP administers penicillin G (Bicillin) to a 75-year-old patient who has COPD and heart failure.The patient takes digoxin,warfarin,and spironolactone.To help prevent drug interactions,the NP should order:

A) serum electrolytes.
B) coagulation studies.
C) creatinine clearance.
D) liver transaminases aspartate aminotransferase and alanine aminotransferase.