NPPB and hydrops fetalis: According to the authors’ conclusions “exhaled breath acetone (EBA) seems to be not only a promising non-invasive diagnostic method of HF, whose accuracy is equivalent to BNP, but also a new biomarker of HF severity, since EBA levels differed significantly as a function of severity of HF (NYHA—New York Heart Association classification)”.[8] Other studies have shown higher levels of acetone in exhaled breath of patients with heart disease[9,10].