1.2.1We suggest measuring biomarkers of CKD-MBD (Ca, P, ALP, PTH, 25(OH)D, HCO3) with frequency of assessment based on the infant’s (corrected) age, stage of CKD, underlying disease, and the presence and severity of MBD (level C, moderate recommendation). Here, PTH is linked to Marchiafava-Bignami disease.