A client seen in the clinic with shortness of breath and fatigue is being evaluated for a possible diagnosis of heart failure. Which laboratory result will be the most useful for diagnosing heart failure?
B-type natriuretic peptide (BNP)
Troponin I
Blood urea nitrogen (BUN)
Platelet levels
The Correct Answer is A
A. B-type natriuretic peptide (BNP): BNP levels are elevated in heart failure due to increased pressure and stretch in the heart's chambers. It is a key marker used to diagnose and assess the severity of heart failure.
B. Troponin I: This marker is used to diagnose myocardial infarction (heart attack) rather than heart failure. Elevated troponin levels indicate damage to the heart muscle.
C. Blood urea nitrogen (BUN): BUN levels can be elevated in heart failure due to decreased renal perfusion, but it is not as specific for diagnosing heart failure as BNP.
D. Platelet levels: Platelet levels are not directly related to the diagnosis of heart failure. They are more relevant for assessing clotting disorders and other conditions.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Levothyroxine replacement test: This test is used to assess the thyroid's response to synthetic thyroid hormone and is not used to differentiate types of hyperthyroidism.
B. Radioactive iodine uptake (RAIU) test: This test measures the thyroid gland's ability to absorb iodine, which helps differentiate Graves' disease (characterized by increased uptake) from other forms of hyperthyroidism, such as thyroiditis (which may show decreased uptake).
C. Adrenocorticotropic hormone (ACTH) stimulation test: This test is used to evaluate adrenal function and is not relevant for diagnosing or differentiating forms of hyperthyroidism.
D. Subtotal thyroidectomy: This is a surgical procedure rather than a diagnostic test and would not be used to differentiate between types of hyperthyroidism.
Correct Answer is A
Explanation
A. B-type natriuretic peptide (BNP): BNP levels are elevated in heart failure due to the heart's response to increased pressure and volume overload. This biomarker is used specifically to diagnose and assess the severity of heart failure.
B. Troponin I: This is a marker for myocardial injury and is used to diagnose acute myocardial infarction rather than heart failure.
C. Blood urea nitrogen (BUN): While elevated BUN can be associated with renal dysfunction or fluid overload in heart failure, it is not specific to diagnosing heart failure.
D. Platelet levels: These are not directly related to diagnosing heart failure and do not provide information about cardiac function.
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