What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveObservation

LOINC Code 42180-0: C peptide post fast [Moles/Vol]

Name: LOINC Code 42180-0: C peptide post fast [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:28.127Z

42180-0 is a LOINC code used to identify C peptide post fast [Moles/Vol] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component C peptide^post CFst. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

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 C peptide^post CFst. It is commonly used with the system or sample type Ser/Plas.

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
Order vs observation: Observation

What it does not mean

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

Key facts

C peptide [Moles/volume] in Serum or Plasma --fasting
C peptide^post CFst
After; Calorie Fast; CHEMISTRY.CHALLENGE TESTING; Connecting peptide of insulin; Fast; Fasting; Level; p fast; PC; Pept; Pl; Plasma; Plsm; Point in time; Pro-insulin c peptide; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Substance concentration

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

C peptide post fast [Moles/Vol]C peptide [Moles/volume] in Serum or Plasma --fastingC peptide p fast SerPl-sCncC peptide^post CFstCHALC peptide after Fast, BloodSCnc

Frequently asked questions

Code details

Code42180-0

SystemLOINC

Display nameC peptide post fast [Moles/Vol]

DescriptionC peptide^post CFst

Short nameC peptide p fast SerPl-sCnc

ComponentC peptide^post CFst

PropertySCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsnmol/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.16

Last changed2.70

Consumer names

C peptide after Fast, Blood

Part names

C peptide^post CFstSCncPtSer/PlasQnSubstance ConcentrationPoint in time (spot)Serum or Plasma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.