Table 1

Comparison of nonfasting C-peptide with peak stimulated MMTT C-peptide

Nonfasting C-peptide (random)Peak C-peptide during MMTT
C-peptide
≥0.2 nmol/LC-peptide
0.017–0.2 nmol/LC-peptide
<0.017 nmol/LTotal
C-peptide ≥0.2 nmol/L621063 (23%)
C-peptide 0.017–0.2 nmol/L298910128 (48%)
C-peptide <0.017 nmol/L1146378* (29%)
Total92 (34%)104 (39%)73 (27%)269**
  • Each cell represents the number of subjects in each category defined by C-peptide value on nonfasting and MMTT tests.

  • * Approximately 10 controls (C-peptide negative) per age/duration subgroup were asked to return for MMTT.

  • ** Total number of participants who came in for 1-month MMTT within 35 days of baseline nonfasting test (prespecified visit window).