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)?
10 mm wheal
5 mm induration
15 mm induration
4 mm erythema
The Correct Answer is C
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason:
Danazol is a synthetic steroid that is typically used to treat endometriosis and fibrocystic breast disease. It is not indicated for the treatment of benign prostatic hyperplasia (BPH) and could potentially worsen symptoms due to its androgenic effects.
Choice B reason:
Methyltestosterone is an anabolic steroid with androgenic properties, similar to the male hormone testosterone. It is used to treat men with testosterone deficiency. However, it is not used for BPH treatment and, like danazol, could exacerbate BPH symptoms due to its androgenic activity.
Choice C reason:
Finasteride is a 5-alpha reductase inhibitor that is commonly prescribed for the treatment of BPH. It works by inhibiting the conversion of testosterone to dihydrotestosterone (DHT), a hormone that contributes to prostate growth. By reducing DHT levels, finasteride can help shrink the prostate and alleviate urinary symptoms associated with BPH.
Choice D reason:
Fluoxymesterone is another anabolic steroid with testosterone-like effects. It is used to treat conditions associated with a deficiency or absence of endogenous testosterone. It is not suitable for BPH treatment and could potentially worsen the condition due to its androgenic properties.
Correct Answer is A
Explanation
Choice A reason:
The inability to abduct the arm at the shoulder is a classic sign of a rotator cuff injury. The rotator cuff is responsible for stabilizing the shoulder joint and aiding in various movements, including abduction. When there is a tear or significant weakness in the rotator cuff muscles, especially the supraspinatus muscle, the patient may be unable to lift the arm away from the body or may experience pain while doing so.
Choice B reason:
A negative drop arm test would actually indicate that there is no rotator cuff injury. The drop arm test is performed by asking the patient to fully abduct the arm to 90 degrees and then slowly lower it. If the patient can control the motion and lower the arm smoothly, the test is negative. A positive drop arm test, where the patient cannot control the descent of the arm, would suggest a rotator cuff tear.
Choice C reason:
While an alteration in the contour of the joint may indicate some form of shoulder pathology, it is not specific to a rotator cuff injury. Changes in the contour could be due to various conditions, including dislocation, arthritis, or other musculoskeletal disorders.
Choice D reason:
A positive Tinel's sign is used to diagnose nerve compression or nerve damage, not rotator cuff injuries. It is performed by tapping over the course of a nerve to elicit a tingling sensation or pain in the distribution of the nerve. This sign is commonly associated with conditions like carpal tunnel syndrome.
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