Final answer:
A prolonged activated partial thromboplastin time (aPTT) of 54 seconds is a contraindication for cholecystectomy due to the increased risk of bleeding during surgery.
Step-by-step explanation:
A patient with cholelithiasis who requires cholecystectomy, or the surgical removal of the gallbladder, may face certain contraindications for the procedure. Among the options provided, an activated partial thromboplastin time (aPTT) of 54 seconds is a significant contraindication for surgery. A prolonged aPTT indicates a potential bleeding risk, which could result in excessive bleeding during the surgery and is therefore a concern that must be addressed prior to proceeding with the cholecystectomy.