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 ["B","C","E"]
Explanation
Choice A reason:
Polyuria, or excessive urination, is not typically a direct complication of a cervical spinal cord injury. Polyuria can be related to other conditions such as diabetes or the use of diuretics.
Choice B reason:
A weakened gag reflex can be a complication of a cervical spinal cord injury, especially if the injury affects the nerves that supply the muscles involved in swallowing. This can increase the risk of aspiration and requires careful monitoring.
Choice C reason:
Hypotension, or low blood pressure, is a common complication following a spinal cord injury due to the disruption of the autonomic pathways that control blood pressure. This condition, known as neurogenic shock, can occur in the acute phase following the injury.
Choice D reason:
Hyperthermia, or elevated body temperature, is not a common direct complication of a cervical spinal cord injury. However, the injury can disrupt temperature regulation, leading to difficulty in either staying warm or cooling down, depending on the environment and level of injury.
Choice E reason:
An absence of bowel sounds can indicate a complication of a cervical spinal cord injury, as the injury may disrupt the normal functioning of the bowel. This can lead to ileus or bowel obstruction, which requires prompt medical attention.
Correct Answer is B
Explanation
Choice A reason:
This choice suggests a pH of 7.50, which is indicative of alkalosis, and not typically expected in a client with chronic kidney disease (CKD). CKD often leads to metabolic acidosis due to the accumulation of acids in the body as the kidneys fail to excrete them. The HCO₃⁻ level of 20 mEq/L is slightly lower than the normal range (22-26 mEq/L), and the PaCO₂ of 32 mm Hg is within the normal range (35-45 mm Hg), but these values do not align with the expected acidosis associated with CKD.
Choice B reason:
This set of values is consistent with metabolic acidosis, which is commonly seen in clients with CKD. A pH of 7.25 indicates acidemia, and an HCO₃⁻ level of 19 mEq/L is below the normal range, suggesting a primary metabolic acidosis. The PaCO₂ of 30 mm Hg is at the lower end of the normal range, which may indicate a compensatory respiratory response to the metabolic acidosis.
Choice C reason:
A pH of 7.30, while on the lower side, is not as acidic as one would expect in a client with CKD. The HCO₃⁻ level of 26 mEq/L is within the normal range, and a PaCO₂ of 50 mm Hg suggests respiratory acidosis, which is not the primary disorder in CKD.
Choice D reason:
This choice indicates a pH of 7.55, which is too alkaline and not characteristic of CKD, where metabolic acidosis is the expected finding. An HCO₃⁻ level of 30 mEq/L is higher than the normal range, suggesting metabolic alkalosis. The PaCO₂ of 31 mm Hg is slightly below the normal range, possibly indicating a compensatory response, but it does not align with the metabolic acidosis typically seen in CKD.
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