Diabetomics developed the first rapid point-of-care test for C-peptide estimation. The Insudex® C-peptide POC test has a wide dynamic range and sensitivity comparable to a laboratory-based predicate assay. The availability of a rapid, simple-to-use POC test for C-peptide will facilitate staging of presymptomatic T1D and differential diagnosis of late-onset T1D, LADA, and MODY.