The normal range for brain natriuretic peptide levels is zero to 99 picograms per milliliter, notes WebMD. This can also be converted to zero to 99 nanograms per liter.
Brain natriuretic peptide is made in the heart and appears in the blood, states WebMD. When the heart works harder, it releases more brain natriuretic peptide. A high level of brain natriuretic peptide is indicative of heart failure, and the level can determine the condition's severity. Brain natriuretic peptide levels are also used to check the effectiveness of heart failure treatments, as these can lower brain natriuretic peptide levels. Having lung disease, kidney disease, or a heart attack can also increase the amount of brain natriuretic peptide in the bloodstream. Brain natriuretic peptide levels also increase with age, though they should still remain within a normal range unless there is heart failure.