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 6366-9: C. difficile toxin B IA Qn (Specimen)

Name: LOINC Code 6366-9: C. difficile toxin B IA Qn (Specimen)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:42.802Z

6366-9 is a LOINC code used to identify C. difficile toxin B IA Qn (Specimen) 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 Clostridioides difficile toxin B. It is commonly used with the system or sample type XXX.

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 Clostridioides difficile toxin B. It is commonly used with the system or sample type XXX.

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: IA

What it does not mean

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

Key facts

Clostridioides difficile toxin B [Units/volume] in Specimen by Immunoassay
Clostridioides difficile toxin B
Arbitrary concentration; C diff; C diff Tox; C diff Tox B; C difficile; Clostridium difficile; EIA; ELFA; ELISA; Enzyme immunoassay; IAA; ID; Infectious Disease; InfectiousDisease; MEIA; Microbiology; Misc; Miscellaneous; Other; Point in time; QNT; Quan; Quant; Quantitative; Random; Spec; SUDS; To be specified in another part of the message; Unspecified

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. difficile toxin B IA Qn (Specimen)Clostridioides difficile toxin B [Units/volume] in Specimen by ImmunoassayC diff Tox B Spec IA-aCncClostridioides difficile toxin BMICROClostridioides difficile toxin B, SpecimenACnc

Frequently asked questions

Code details

Code6366-9

SystemLOINC

Display nameC. difficile toxin B IA Qn (Specimen)

DescriptionClostridioides difficile toxin B

Short nameC diff Tox B Spec IA-aCnc

ComponentClostridioides difficile toxin B

PropertyACnc

TimingPt

System (specimen)XXX

ScaleQn

MethodIA

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0f

Last changed2.69

Consumer names

Clostridioides difficile toxin B, Specimen

Part names

Clostridioides difficile toxin BACncPtXXXQnIAArbitrary ConcentrationPoint in time (spot)Immunoassay

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.