CST3 and coronary artery disorder: Opotowsky et al. (2019) in a large cohort of adults with CHD, including also 131 Fontan patients, found that only cystatin C-based eGFR strongly predicted clinical events compared to creatinine-based eGFR in adult CHD; in particular, the authors opened a discussion on the limits of creatinine-based methods in the Fontan circulation [93].