Therefore, the patient was diagnosed with fulminant T1D mellitus.[6] The patient was identified as having the human leukocyte antigen (HLA) class II alleles DRB1*09:01 and DQB1*03:03, which are related to susceptibility to T1D.[7] The patient hyperglycemia and ketoacidosis were managed with extracellular fluid monitoring, continuous venous insulin infusion, and multiple daily insulin injections. The gene discussed is INS; the disease is type 1 diabetes mellitus.