A nurse is reviewing the medical records of four clients. The nurse should identify that which of the following client findings requires follow-up care?

A. Incorrect – Warfarin is generally safe while breastfeeding, as it does not significantly transfer into breast milk. B. Incorrect – Sodium phosphate is a common bowel prep before a colonoscopy. No immediate concerns. C. Correct – A Mantoux test (PPD skin test) with induration could indicate tuberculosis (TB) infection. The size of the induration (not redness) determines if the result is positive and requires further testing. D. Incorrect – Bumetanide is a loop diuretic, and increased urination is an expected effect.