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 8179-4: Cannabinoids Screen Ql (Unknown substance)

Name: LOINC Code 8179-4: Cannabinoids Screen Ql (Unknown substance)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:05.776Z

8179-4 is a LOINC code used to identify Cannabinoids Screen Ql (Unknown substance) 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 Cannabinoids. It is commonly used with the system or sample type Unk sub.

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 Cannabinoids. It is commonly used with the system or sample type Unk sub.

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
Method: Screen

What it does not mean

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

Key facts

Cannabinoids [Presence] in Unknown substance by Screen method
Cannabinoids
Addiction; Cannabinoid; Delta-9-tetrahydrocannabinol; DRUG/TOXICOLOGY; Drugs; Drugs of abuse; Illicit; Marijuana; Ordinal; Point in time; PotentialForAbuse; PR; QL; Qual; Qualitative; Random; Scn; Scr; Screen; Scrn; THC; Unknown substance; Usub

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

Cannabinoids Screen Ql (Unknown substance)Cannabinoids [Presence] in Unknown substance by Screen methodCannabinoids Usub Ql ScnCannabinoidsDRUG/TOXCannabinoids, Unknown substancePrThr

Frequently asked questions

Code details

Code8179-4

SystemLOINC

Display nameCannabinoids Screen Ql (Unknown substance)

DescriptionCannabinoids

Short nameCannabinoids Usub Ql Scn

ComponentCannabinoids

PropertyPrThr

TimingPt

System (specimen)Unk sub

ScaleOrd

MethodScreen

ClassDRUG/TOX

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0h(2)

Last changed2.56

Consumer names

Cannabinoids, Unknown substance

Part names

CannabinoidsPrThrPtUnk subOrdScreenPresence or ThresholdPoint in time (spot)Unknown substanceToxicology screen

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.