LOINC Code 62803-2: PhenX - fasting C-peptide assay for residual beta cell function protocol 141201

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component PhenX - fasting C-peptide assay for residual beta cell function protocol 141201. It is commonly used with the system or sample type ^Patient.

When is it used?

• Used in lab systems, EHRs, and clinical data exchange.
• May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
• Status: ACTIVE
• Panel type: Panel
• Method: PhenX

What it does not mean

• The code identifies the observation or test, not the actual result.

Key facts

• PhenX - fasting C-peptide assay for residual beta cell function protocol 141201
• This protocol provides instructions for drawing, processing and storing blood according to the National Health and Nutrition Examination Survey (NHANES) methods. As there are no standard assays for C-peptide, the protocol also provides basic guidelines to aid comparability among different studies. Although all three are valuable stand alone measures and all should be collected if resources are available, the Diabetes Working Group recommends that investigators prioritize Insulin 1st, C-peptide 2nd and Proinsulin 3rd. This is because results from the Insulin bioassay can be combined with results from Fasting Plasma Glucose bioassay to derive the homeostatic model assessment (HOMA) of insulin resistance and pancreatic beta cell function. The Diabetes Working Group notes that while it is not the preferred method, the C-peptide Assay can be performed on individuals who have not met the fasting requirements.
• B; C peptide; Connecting peptide of insulin; Fasting C-peptide proto; FCN; Func; Funct; Pan; Panel; PANEL.PHENX; Panl; Pept; Pnl; Point in time; Pro-insulin c peptide; Random

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Frequently asked questions