The purpose of this study is to collect blood specimens and determine the levels of natriuretic peptides in the blood in patients that are presenting with a suspicion of new onset or worsening symptoms of heart failure. Blood specimens collected during this study will be used to support expanded development of a blood test that can help physicians diagnose heart failure.

The blood test (Access BNP Assay) being developed will measure natriuretic peptides that are released into the blood when the heart muscle is stretched and working too hard. This information is being used to develop a better blood test(s).