Understanding Normal BNP Levels in Heart Failure

A nurse is caring for a 50-year-old female patient who has been admitted with symptoms of heart failure. The healthcare team decides to monitor her serum B-type natriuretic peptide (BNP) levels, which are critical in diagnosing and managing heart failure. The nurse notes that a normal BNP level is typically less than __________ pg/mL. Elevated levels can indicate worsening heart failure and the need for further interventions.