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.

LOINCActiveBoth

LOINC Code 44459-6: C peptide/Creatinine 2nd specimen post Unsp challenge (U) [Mass ratio]

Name: LOINC Code 44459-6: C peptide/Creatinine 2nd specimen post Unsp challenge (U) [Mass ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:29.268Z

44459-6 is a LOINC code used to identify C peptide/Creatinine 2nd specimen post Unsp challenge (U) [Mass ratio] 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/Creatinine^2nd specimen post XXX challenge. It is commonly used with the system or sample type Urine.

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/Creatinine^2nd specimen post XXX challenge. It is commonly used with the system or sample type Urine.

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: Both

What it does not mean

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

Key facts

C peptide/Creatinine [Mass Ratio] in Urine --2nd specimen post XXX challenge
C peptide/Creatinine^2nd specimen post XXX challenge
After; CHEMISTRY.CHALLENGE TESTING; Connecting peptide of insulin; Convalescent; CR; Crea; Creat; Mass concentration ratio; Mass ratio; MCRto; p chal; Pept; Point in time; Post immunization; Pro-insulin c peptide; PST; QNT; Quan; Quant; Quantitative; Random; Second; sp2; sp2 p chal; Spec; UA; UCr; UR; Urn

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/Creatinine 2nd specimen post Unsp challenge (U) [Mass ratio]C peptide/Creatinine [Mass Ratio] in Urine --2nd specimen post XXX challengeC peptide/Creat sp2 p chal UrC peptide/Creatinine^2nd specimen post XXX challengeCHALC peptide/Creatinine - 2nd specimen after challenge, UrineMRto

Frequently asked questions

Code details

Code44459-6

SystemLOINC

Display nameC peptide/Creatinine 2nd specimen post Unsp challenge (U) [Mass ratio]

DescriptionC peptide/Creatinine^2nd specimen post XXX challenge

Short nameC peptide/Creat sp2 p chal Ur

ComponentC peptide/Creatinine^2nd specimen post XXX challenge

PropertyMRto

TimingPt

System (specimen)Urine

ScaleQn

ClassCHAL

Example unitsng/g

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.17

Last changed2.42

Consumer names

C peptide/Creatinine - 2nd specimen after challenge, Urine

Part names

C peptide/Creatinine^2nd specimen post XXX challengeMRtoPtUrineQnMass RatioPoint in time (spot)

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.