The perioperative mortality score aims to predict mortality in elderly patients undergoing noncardiac surgery using three preoperative risk factors (age, albumin and American Society of Anesthesiologists physical status) and then modify this risk assessment if any of three postoperative complications occur (unplanned intensive care unit admission, systemic inflammation and acute renal failure). In order to determine the cost of routine perioperative mortality score calculation in future research, we audited the incidence of clinician-initiated preoperative albumin, pre- and postoperative creatinine and postoperative white cell count testing in patients aged ≥70 years presenting for elective and emergency noncardiac surgery requiring at least overnight admission over a three-month period. We recruited 637 noncardiac surgical patients. All laboratory tests required for perioperative mortality score calculation were performed in only 47% of patients and the total cost of testing all untested patients was A$12,057 (A$18,927 per 1000 patients). Preoperative hypoalbuminaemia was present in 11% of tested patients, acute renal impairment in 24% of tested patients and high white cell count in 33% of tested patients. These results may be used to inform future research or clinical use of the score.