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Assessment of C-peptide levels can identify individuals at risk for or with type 1 diabetes with residual \u03b2-cell function in whom \u03b2 cell-sparing interventions can be evaluated, and can aid in distinguishing type 2 diabetes from Latent Autoimmune Diabetes in Adults and late-onset type 1 diabetes. To facilitate C-peptide testing, we describe a quantitative point-of-care C-peptide test. C-peptide levels as low as 0.2\u2009ng\/ml were measurable in a fingerstick sample, and the test was accurate over a range of 0.17 to 12.0\u2009ng\/ml. This test exhibited a correlation of r\u2009=\u20090.98 with a high-sensitivity commercial ELISA assay and a correlation of r\u2009=\u20090.90 between matched serum and fingerstick samples.<\/jats:p>","DOI":"10.1177\/1932296821995557","type":"journal-article","created":{"date-parts":[[2021,3,17]],"date-time":"2021-03-17T07:28:36Z","timestamp":1615966116000},"page":"976-981","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":6,"title":["Rapid Point-of-Care Test for Determination of C-Peptide Levels"],"prefix":"10.1177","volume":"16","author":[{"given":"Paturi V.","family":"Rao","sequence":"first","affiliation":[{"name":"Diabetomics, Inc., Hillsboro, OR, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eric","family":"Bean","sequence":"additional","affiliation":[{"name":"Diabetomics, Inc., Hillsboro, OR, 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