A nurse in a clinic is reviewing the laboratory values of a client who has primary hypothyroidism. The nurse should anticipate an elevation of which of the following laboratory values?
Free T4
Thyroid stimulating hormone (TSH)
Serum T3
Serum T4
The Correct Answer is B
Choice A reason:
In primary hypothyroidism, the thyroid gland is underactive and does not produce sufficient thyroid hormones, including Free T4. Therefore, we would not expect an elevation of Free T4 in primary hypothyroidism; instead, its levels would typically be low or normal.
Choice B reason:
Thyroid stimulating hormone (TSH) levels are elevated in primary hypothyroidism because the pituitary gland releases more TSH in an attempt to stimulate the thyroid gland to produce more thyroid hormones. This is a compensatory response to the low levels of circulating thyroid hormones, particularly thyroxine (T4).
Choice C reason:
Serum T3 levels may be low or normal in primary hypothyroidism. T3 is the active form of thyroid hormone and is usually converted from T4. If T4 levels are low, T3 levels may also be affected; however, T3 levels are not the primary diagnostic marker for hypothyroidism and do not typically show elevation in this condition.
Choice D reason:
Serum T4 levels are typically low in primary hypothyroidism because the thyroid gland is not producing enough of this hormone. An elevation of serum T4 would not be expected unless the patient is receiving treatment for hypothyroidism.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason:
While examining the client for areas of skin breakdown is an important part of ongoing care, especially for clients with spinal cord injuries who are at increased risk for pressure ulcers, it is not the first action to take when autonomic dysreflexia is suspected. Skin breakdown is not an immediate life-threatening issue compared to the potential complications of autonomic dysreflexia.
Choice B reason:
Checking the client's bladder for distention is a critical step in the management of autonomic dysreflexia, as an overfull bladder is a common trigger for this condition. However, the very first action should be to place the client in a sitting position to lower blood pressure, which can be dangerously high during an episode of autonomic dysreflexia.
Choice C reason:
Checking for fecal impaction is another important intervention for managing autonomic dysreflexia, as an impacted bowel can also trigger an episode. However, similar to checking for bladder distention, this is not the first action to take. Immediate measures to lower blood pressure are prioritized for the safety of the client.
Choice D reason:
Placing the client in a sitting position, or elevating the head of the bed to at least 45 degrees, is the first and most critical action when autonomic dysreflexia is suspected. This position helps to lower blood pressure by promoting venous return to the heart and can prevent complications such as stroke from the sudden hypertension associated with autonomic dysreflexia.
Correct Answer is C
Explanation
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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