A nurse in a community health center is assessing the results of a tuberculin skin test she performed on a client. Which of the following results indicates exposure to and a possible infection with tuberculosis (TB)?

Choice A reason:
While monitoring urinary output is important after surgery to ensure kidney function and that the urinary tract has not been compromised during surgery, it is not the immediate priority. The nurse should ensure that the client is not experiencing postoperative complications such as urinary retention, but this comes after the assessment of vital signs.

Choice B reason:
Oxygen saturation is the priority assessment for a client being admitted from the PACU following an abdominal hysterectomy. Maintaining adequate oxygenation is critical after anesthesia, as respiratory function can be compromised. The nurse must ensure the client's airway is clear and that they are receiving sufficient oxygen to prevent hypoxia and other respiratory complications.

Choice C reason:
Inspecting the abdominal dressing is necessary to check for signs of bleeding or infection at the surgical site. However, this is not the first priority upon admission from the PACU. The nurse will assess the dressing after vital signs and oxygen saturation have been addressed.

Choice D reason:
Pain management is a significant part of postoperative care, and the nurse will need to assess the client's pain level to manage it effectively. However, the immediate priority is to ensure the client's vital signs are stable, which includes oxygen saturation, before addressing pain.

Choice A Reason:
A 10 mm wheal is not indicative of TB infection. A wheal is a raised, often itchy area of skin that usually signifies an allergic reaction, not an infection. The TST looks for induration, which is a firm swelling, as a sign of TB infection.

Choice B Reason:
A 5 mm induration is considered positive in certain high-risk groups, such as people living with HIV, recent contacts of TB patients, or those with a history of organ transplants. For individuals without these risk factors, a 5 mm induration is not considered a positive result.

Choice C Reason:
A 15 mm induration is considered a positive TST result for individuals with no known risk factors for TB. This indicates that the person's immune system has reacted to the tuberculin purified protein derivative (PPD) injected under the skin, suggesting exposure to TB bacteria.

Choice D Reason:
Erythema, or redness of the skin, is not measured when interpreting TST results. The test measures induration, which is a palpable, raised, hardened area or swelling. Therefore, a 4 mm erythema does not indicate TB infection.