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.
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Related Questions
Correct Answer is D
Explanation
Choice A reason:
Annular lesions are ring-shaped with a clear center, which does not describe a lesion with a wavy border. This term is typically used for lesions like ringworm, which present as circular rashes with normal skin in the center.
Choice B reason:
Circinate lesions are also circular but are not characterized by a wavy border. They are similar to annular lesions but often have a more rounded edge and are associated with conditions like psoriasis.
Choice C reason:
Coalesced lesions refer to multiple lesions that have merged to form a larger one. While they can have irregular borders, 'coalesced' does not specifically describe the wavy nature of the border.
Choice D reason:
Serpiginous lesions have a wavy or snake-like border, which matches the description provided by the nurse. This term is often used for parasitic infections, such as cutaneous larva migrains, which create a trail-like pattern on the skin.
Correct Answer is C
Explanation
Choice A reason:
Keeping artificial nails trimmed is a recommended practice in healthcare settings to maintain effective hand hygiene. Long nails can harbor bacteria and make it difficult to clean hands thoroughly. However, the CDC does not provide specific guidelines on the length of artificial nails for healthcare workers.
Choice B reason:
When caring for a client with Clostridium difficile, it is recommended to wash hands with soap and water rather than using alcohol-based hand rubs. Alcohol-based hand rubs are not effective against C. difficile spores. Therefore, thorough handwashing with soap and water is necessary to remove spores.
Choice C reason:
Chlorhexidine is an antiseptic agent that provides broad-spectrum antimicrobial activity and is recommended for hand hygiene in certain situations, such as before invasive procedures or for clients who are immunosuppressed. It is effective against a wide range of bacteria, viruses, and fungi, making it a suitable choice for immunocompromised patients to reduce the risk of infection.
Choice D reason:
The use of alcohol-based hand rubs before administering eye drops is not specifically recommended. While hand hygiene is essential before any contact with a patient, there is no particular preference for alcohol-based hand rubs in this context. The primary concern is to ensure that hands are clean to prevent contamination of the eye drops or the patient's eyes.
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