A nurse on a medical-surgical unit is receiving reports for four clients. Which of the following clients should the nurse assess first?

A client who is receiving a blood transfusion and reports low-back pain

A female client who is scheduled for chemotherapy and has an RBC count of 4.0 x105/uL (4.2 to 5.4 x106/uL)

A client who is 24 hr postoperative following a transurethral resection of the prostate and has small blood clots in the drainage tubing

A client who is 2 days postoperative following placement of an ascending colostomy and has shreds of bloody mucus in the bag