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Table. 1.

Table. 1.

Analytical percentage recovery of added C-peptide for the ID-LC–MS/MS method

Concentration Added C-peptide, ng Expected result, ng/g (pmol/L) Mean detected result, ng/g (pmol/L) Mean relative recovery, % Relative recovery range, % CV, % (N = 6)
0 - 1.86 (619.0) 1.86 (619.0) - - -
1 1.14 3.00 (1,000.0) 3.01 (1,003.3) 100.6 100.3 – 100.7 0.3
2 1.83 3.69 (1,230.0) 3.72 (1,240.0) 100.6 100.4 – 101.0 0.3
3 3.43 5.29 (1,763.3) 5.28 (1,676.0) 99.8 99.6 – 100.7 0.9

Abbreviation: ID-LC–MS/MS, isotope dilution liquid chromatography-tandem mass spectrometry.

Ann Lab Med 2023;43:345~354 https://doi.org/10.3343/alm.2023.43.4.345

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