A nurse is providing teaching to a client who has a new prescription for warfarin. Which of the following findings requires a referral for further care?

A client who is taking warfarin and has started working in a parking garage 3 months ago.

A client who is taking bumetanide and reports an increase in urinary frequency.

A client who received a Mantoux test 48 hr ago and has an induration.

A client who is 1 day postoperative following a total knee replacement.