C-Peptide (C-Peptide) yog ib qho peptide txuas uas muaj 31 amino acids nrog qhov hnyav molecular ntawm kwv yees li 3021 Daltons. Cov pancreatic β-cells ntawm pancreas synthesize proinsulin, uas yog ib txoj saw protein ntev heev. Proinsulin raug rhuav tshem ua peb ntu nyob rau hauv qhov kev ua ntawm cov enzymes, thiab cov ntu pem hauv ntej thiab nraub qaum tau rov txuas dua los ua insulin, uas yog tsim los ntawm A thiab B saw, thaum ntu nruab nrab yog ywj pheej thiab hu ua C-peptide. Insulin thiab C-peptide raug tso tawm hauv equimolar concentrations, thiab tom qab nkag mus rau hauv cov ntshav, feem ntau ntawm insulin raug inactivated los ntawm lub siab, thaum C-peptide tsis tshua muaj kev noj los ntawm lub siab, ntxiv rau C-peptide degradation qeeb dua li insulin, yog li qhov concentration ntawm C-peptide hauv cov ntshav siab dua li ntawm insulin, feem ntau ntau dua 5 zaug, yog li C-peptide qhia meej dua qhov ua haujlwm ntawm pancreatic islet β-cells. Kev ntsuas qib ntawm C-peptide siv tau rau kev faib tawm ntawm cov ntshav qab zib thiab kom nkag siab txog kev ua haujlwm ntawm pancreatic β-cells ntawm cov neeg mob ntshav qab zib. Kev ntsuas qib C-peptide siv tau los faib tawm ntshav qab zib thiab nkag siab txog kev ua haujlwm ntawm pancreatic β-cells hauv cov neeg mob ntshav qab zib. Tam sim no, cov txheej txheem ntsuas C-peptide siv dav hauv cov chaw kho mob suav nrog radioimmunoassay, enzyme immunoassay, electrochemiluminescence, chemiluminescence.