What are the abnormal lab values seen in heart failure?

In heart failure, common abnormal lab values include elevated levels of B-type natriuretic peptide (BNP) or N-terminal pro-BNP (NT-proBNP), which indicate cardiac stress and fluid overload. Additionally, renal function may be impaired, leading to elevated creatinine and blood urea nitrogen (BUN) levels. Electrolyte imbalances, particularly hyponatremia (low sodium) and hyperkalemia (high potassium), can also occur due to fluid retention and medication effects. Lastly, liver function tests may show elevated liver enzymes if congestion affects hepatic circulation.