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 50465-4: C peptide 5th specimen [Moles/Vol]

Name: LOINC Code 50465-4: C peptide 5th specimen [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:34.496Z

50465-4 is a LOINC code used to identify C peptide 5th specimen [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^5th specimen. 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^5th specimen. 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 --5th specimen
C peptide^5th specimen
CHEMISTRY.CHALLENGE TESTING; Connecting peptide of insulin; Level; Pept; Pl; Plasma; Plsm; Point in time; Pro-insulin c peptide; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; sp5; Spec; 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 5th specimen [Moles/Vol]C peptide [Moles/volume] in Serum or Plasma --5th specimenC peptide sp5 SerPl-sCncC peptide^5th specimenCHALC peptide specimen 5, BloodSCnc

Frequently asked questions

Code details

Code50465-4

SystemLOINC

Display nameC peptide 5th specimen [Moles/Vol]

DescriptionC peptide^5th specimen

Short nameC peptide sp5 SerPl-sCnc

ComponentC peptide^5th specimen

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 released2.22

Last changed2.34

Consumer names

C peptide specimen 5, Blood

Part names

C peptide^5th specimenSCncPtSer/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.