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 16905-2: Glucose 2nd specimen post Unsp challenge Ql (U)

Name: LOINC Code 16905-2: Glucose 2nd specimen post Unsp challenge Ql (U)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:26.381Z

16905-2 is a LOINC code used to identify Glucose 2nd specimen post Unsp challenge Ql (U) 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 Glucose^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 Glucose^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: Observation

What it does not mean

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

Key facts

Glucose [Presence] in Urine --2nd specimen post XXX challenge
Glucose^2nd specimen post XXX challenge
After; CHEMISTRY.CHALLENGE TESTING; Convalescent; Glu; Glu tol; Gluc; Glucose tolerance; Glucoseur; GTT; Ordinal; p chal; Point in time; Post immunization; PR; PST; QL; Qual; Qualitative; Random; Screen; Second; sp2; sp2 p chal; Spec; UA; 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

Glucose 2nd specimen post Unsp challenge Ql (U)Glucose [Presence] in Urine --2nd specimen post XXX challengeGlucose sp2 p chal Ur QlGlucose^2nd specimen post XXX challengeCHALGlucose 2nd specimen after challenge, UrinePrThr

Frequently asked questions

Code details

Code16905-2

SystemLOINC

Display nameGlucose 2nd specimen post Unsp challenge Ql (U)

DescriptionGlucose^2nd specimen post XXX challenge

Short nameGlucose sp2 p chal Ur Ql

ComponentGlucose^2nd specimen post XXX challenge

PropertyPrThr

TimingPt

System (specimen)Urine

ScaleOrd

ClassCHAL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.56

Consumer names

Glucose 2nd specimen after challenge, Urine

Part names

Glucose^2nd specimen post XXX challengePrThrPtUrineOrdPresence or ThresholdPoint 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.