LOINC Code 62802-4: Deprecated PhenX measure - fasting C-peptide assay for residual beta cell function

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 measure - fasting C-peptide assay for residual beta cell function. 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: DEPRECATED
• Method: PhenX

What it does not mean

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

Key facts

• Deprecated PhenX measure - fasting C-peptide assay for residual beta cell function
• PhenX measure - fasting C-peptide assay for residual beta cell function
• A bioassay to measure serum concentration of C-peptide (connecting peptide), a small peptide that is cleaved from the proinsullin protein to form an active insulin protein. This peptide is produced by the pancreas as a by-product of insulin processing. C-peptide levels may be used to differentiate type 1 from type 2 diabetes. People whose pancreas does not make any insulin (type 1 diabetes) have low levels of insulin and C-peptide. A person with type 2 diabetes has a normal or high level of C-peptide. C-peptide levels can be a more sensitive test of pancreas activity than insulin because they are not confounded by insulin replacement therapy. (Marques et al., 2004, American Diabetes Association, 2010).
• B; C peptide; Connecting peptide of insulin; 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