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 56788-3: Insulin 28 Hr post Unsp challenge Qn

Name: LOINC Code 56788-3: Insulin 28 Hr post Unsp challenge Qn
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.264Z

56788-3 is a LOINC code used to identify Insulin 28 Hr post Unsp challenge Qn 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 Insulin^28H post XXX challenge. 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 Insulin^28H post XXX challenge. 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

Insulin [Units/volume] in Serum or Plasma --28 hours post XXX challenge
Insulin^28H post XXX challenge
28h p chal; After; Arbitrary concentration; CHEMISTRY.CHALLENGE TESTING; HUM; Humulin; IH7; Insul; Lente; NPH; p chal; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; Semilente; SerP; SerPl; SerPlas; Serum; Serum or plasma; Sliding; SR; Ultralente

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

Insulin 28 Hr post Unsp challenge QnInsulin [Units/volume] in Serum or Plasma --28 hours post XXX challengeInsulin 28h p chal SerPl-aCncInsulin^28H post XXX challengeCHALInsulin 28 hr after challenge, BloodACnc

Frequently asked questions

Code details

Code56788-3

SystemLOINC

Display nameInsulin 28 Hr post Unsp challenge Qn

DescriptionInsulin^28H post XXX challenge

Short nameInsulin 28h p chal SerPl-aCnc

ComponentInsulin^28H post XXX challenge

PropertyACnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsmIU/mL;uIU/mL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.29

Last changed2.68

Consumer names

Insulin 28 hr after challenge, Blood

Part names

Insulin^28H post XXX challengeACncPtSer/PlasQnArbitrary 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.