PT - JOURNAL ARTICLE AU - Daniel Chan AU - Wilsie Martillano Salas-Walinsundin AU - Fabian Kok Peng Yap AU - Mark Jean Aan Koh TI - Calcium management challenges in a macrosomic child with subcutaneous fat necrosis AID - 10.1136/bcr-2018-227141 DP - 2019 Feb 01 TA - BMJ Case Reports PG - e227141 VI - 12 IP - 2 4099 - http://casereports.bmj.com/content/12/2/e227141.short 4100 - http://casereports.bmj.com/content/12/2/e227141.full SO - BMJ Case Reports2019 Feb 01; 12 AB - We present a case that illustrates the fluctuations in calcium levels to be expected while managing an infant with maternal gestational diabetes mellitus who also develops subcutaneous fat necrosis (SCFN). There is initial hypocalcaemia due to functional hypoparathyroidism, requiring judicious calcium replacement. But with increased extrarenal production of 1,25-dihydroxyvitamin D due to granulomatous inflammation of subcutaneous adipose tissue, hypercalcaemia ensues. With a self-limiting course, SCFN of the newborn has an excellent prognosis and resolves spontaneously. However, aberrations in serum calcium levels can manifest in life-threatening complications and must hence be closely monitored.