There are about 50 million cardiac biomarker tests performed in the US annually, representing a $300 million to $1.25 billion market. If better biomarkers were developed, an additional 48.5 million tests could be performed for diagnosing and monitoring heart failure, representing a potential additional market of $40 million to over $1 billion. The document lists several companies that operate in the novel cardiac biomarker space and describes different types of biomarkers related to myocardial injury, stress, inflammation, and other cardiac and extra-cardiac factors that could help diagnose and manage conditions like acute coronary syndrome, heart failure, and stroke.