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:
Hyperplasia is an increase in the number of cells in an organ or tissue, which can lead to its enlargement. While hyperplasia can be a response to a stimulus and is not necessarily precancerous, it does not describe the abnormal changes in the shape, size, and organization of mature cells.
Choice B reason:
Metaplasia is a reversible change in which one differentiated cell type is replaced by another cell type. This process can be a response to chronic irritation and inflammation, and while it may predispose cells to cancerous changes, it is not in itself a precancerous condition.
Choice C reason:
The term 'malignant' refers to cancerous cells that have the ability to invade and destroy nearby tissue and spread to other parts of the body. The description of the cells as 'moderately abnormal' does not indicate that the cells are malignant but rather that they are showing signs of potentially precancerous changes.
Choice D reason:
Dysplasia refers to the presence of abnormal cells within a tissue or organ. It is characterized by changes in cell size, shape, uniformity, arrangement, and structure, particularly when such changes are strongly suggestive of developing neoplasia, or new, abnormal growth. In the context of a Pap smear, dysplasia is indicative of precancerous changes and is the term used to describe the abnormal development of cells on the cervix.
Correct Answer is C
Explanation
Choice A reason:
Hay fever allergy, also known as allergic rhinitis, is primarily associated with the action of Immunoglobulin E (IgE) antibodies and not directly with T-cells. T-cells can contribute to the regulation of the immune response in allergies, but IgE is the main immunoglobulin involved in the typical symptoms of hay fever.
Choice B reason:
Anaphylaxis is a severe, potentially life-threatening allergic reaction that involves the release of large amounts of histamine and other chemicals from mast cells and basophils, often triggered by IgE antibodies. While T-cells can play a role in the sensitization phase of allergy, anaphylaxis itself is not directly caused by T-cells.
Choice C reason:
Transplant rejection is a process in which T-cells play a central role. When a transplant recipient's immune system recognizes the donated organ as foreign, T-cells can mediate the rejection by attacking the transplanted tissue, leading to its failure.
Choice D reason:
Bacterial phagocytosis is primarily the function of phagocytes like neutrophils and macrophages. T-cells are involved in the adaptive immune response and can activate phagocytes, but they do not directly perform phagocytosis.
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