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 8155-4: Amphetamines Confirm Ql (Unknown substance)

Name: LOINC Code 8155-4: Amphetamines Confirm Ql (Unknown substance)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:05.775Z

8155-4 is a LOINC code used to identify Amphetamines Confirm 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 Amphetamines. 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 Amphetamines. 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: Confirm

What it does not mean

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

Key facts

Amphetamines [Presence] in Unknown substance by Confirmatory method
Amphetamines
Addiction; Amph; Amphetam; Amphetamine; Cfm; CNFR; CNFRM; Conf; Confirmation; Confirmatory; DRUG/TOXICOLOGY; Drugs; Drugs of abuse; GCMS; Illicit; LC/MS/MS; Ordinal; Point in time; PotentialForAbuse; PR; QL; Qual; Qualitative; Random; Screen; Speed; 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

Amphetamines Confirm Ql (Unknown substance)Amphetamines [Presence] in Unknown substance by Confirmatory methodAmphetamines Usub Ql CfmAmphetaminesDRUG/TOXAmphetamines, Unknown substancePrThr

Frequently asked questions

Code details

Code8155-4

SystemLOINC

Display nameAmphetamines Confirm Ql (Unknown substance)

DescriptionAmphetamines

Short nameAmphetamines Usub Ql Cfm

ComponentAmphetamines

PropertyPrThr

TimingPt

System (specimen)Unk sub

ScaleOrd

MethodConfirm

ClassDRUG/TOX

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0h(2)

Last changed2.56

Consumer names

Amphetamines, Unknown substance

Part names

AmphetaminesPrThrPtUnk subOrdConfirmPresence or ThresholdPoint in time (spot)Unknown substance

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.