A patient has developed left heart failure (LHF). Which laboratory test, when elevated, confirms a heart failure diagnosis?
Troponin
Calcium level
B-type natriuretic peptide (BNP)
C-reactive protein (CRP)
The Correct Answer is C
A. Troponin is a biomarker used to diagnose myocardial infarction (heart attack), not heart failure.
B. Calcium levels are important for overall metabolic function but are not specific for heart failure.
C. B-type natriuretic peptide (BNP) is elevated in heart failure, specifically in left heart failure, and helps confirm the diagnosis. BNP is a hormone released by the ventricles in response to increased pressure and volume.
D. C-reactive protein (CRP) is a marker of inflammation but does not specifically confirm a heart failure diagnosis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Troponin is a biomarker used to diagnose myocardial infarction (heart attack), not heart failure.
B. Calcium levels are important for overall metabolic function but are not specific for heart failure.
C. B-type natriuretic peptide (BNP) is elevated in heart failure, specifically in left heart failure, and helps confirm the diagnosis. BNP is a hormone released by the ventricles in response to increased pressure and volume.
D. C-reactive protein (CRP) is a marker of inflammation but does not specifically confirm a heart failure diagnosis.
Correct Answer is D
Explanation
A. Serum creatinine levels within the normal range (0.6-1.2) do not specifically indicate intra-renal AKI.
B. A high 24-hour creatinine clearance is not typically associated with intra-renal AKI, as kidney injury often leads to decreased filtration and clearance.
C. A low serum creatinine level (0.5) would generally indicate good kidney function rather than AKI.
D. Casts in the urine are indicative of damage within the kidney tubules, which is a characteristic finding of intra-renal AKI, often due to cellular injury or necrosis within the kidney itself.
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