The median NT-proBNP among people who were not subsequently diagnosed with HF was 124 pg/mL (IQR [56, 306] pg/mL), with median levels of 724 pg/mL (IQR [245, 1,535] pg/mL) among people with AF and 111 pg/mL (IQR [51, 250] pg/mL) among people without AF. Here, NPPB is linked to hydrops fetalis.