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Message: <blockquote data-quote="Daibell" data-source="post: 2592684" data-attributes="member: 21149"><p>Hi. Be aware that C-Peptide tests can be unreliable. I had a plasma one done privately and it showed very low insulin. Later I had a urine one done in the NHS and it showed higher insulin. With the urine test, they use a ratio of peptide and creatine and this can be unreliable as creatine varies a lot day to day. The blood plasma test needs the sample to be kept very cold which is not easy. Either way expect varied test results. If GAD comes out negative it means very little and rely on the C-Peptide. My NHS consultant treats me a T1 despite my C-peptide being slightly above the T1 reference level. He looks at my weight and BS levels on my Libre together with my insulin needs.</p></blockquote><p></p>

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