INS and MODY: Surprisingly, intravenous glucose tolerance testing demonstrated a normal glucose disappearance rate (K) and first-phase insulin secretion, contradictory to what one would expect in MODY (K 1.38% per min; normal response > 1.2%, first-phase insulin secretion 2.7 nmol l–1 min–1; normal 1.4–5.3 nmol l–1 min–1).