CTNS and hydrops fetalis: While measurement of either NPs or cTns (measured with an hs assay) appears to be associated with a similar prospective risk of incident HF, the cost of measuring hs-cTns is less than a third of the cost of measuring NPs ($12.47 vs. $39.26 US dollars, Centers for Medicare and Medicaid services reimbursement Q3, 2024).