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 73638-9: Ormetroprim+Sulfamethoxazole Disk diffusion (KB) [Susc]

Name: LOINC Code 73638-9: Ormetroprim+Sulfamethoxazole Disk diffusion (KB) [Susc]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:52.635Z

73638-9 is a LOINC code used to identify Ormetroprim+Sulfamethoxazole Disk diffusion (KB) [Susc] 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 Ormetroprim+Sulfamethoxazole. It is commonly used with the system or sample type Isolate.

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 Ormetroprim+Sulfamethoxazole. It is commonly used with the system or sample type Isolate.

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
Method: Agar diffusion

What it does not mean

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

Key facts

Ormetroprim+Sulfamethoxazole [Susceptibility] by Disk diffusion (KB)
Ormetroprim+Sulfamethoxazole
Acetylsulfamethoxazole; ANTIBIOTIC SUSCEPTIBILITIES; AST; c203; c223; C61; Disk diffusion; Gantanol; ID; Infectious Disease; InfectiousDisease; Islt; Isol; KB; Kirby-bauer; Point in time; Primor; Random; SMX; Sulfa; Sulfamethox; Sus; Suscept; Susceptibilities; Susceptibility; Susceptibilty; Vet; Veterinary

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

Ormetroprim+Sulfamethoxazole Disk diffusion (KB) [Susc]Ormetroprim+Sulfamethoxazole [Susceptibility] by Disk diffusion (KB)Ormetroprim+Sulfamethoxazole Islt KBOrmetroprim+SulfamethoxazoleABXBACTSusceptibility to Ormetroprim+SulfamethoxazoleSusc

Frequently asked questions

Code details

Code73638-9

SystemLOINC

Display nameOrmetroprim+Sulfamethoxazole Disk diffusion (KB) [Susc]

DescriptionOrmetroprim+Sulfamethoxazole

Short nameOrmetroprim+Sulfamethoxazole Islt KB

ComponentOrmetroprim+Sulfamethoxazole

PropertySusc

TimingPt

System (specimen)Isolate

ScaleOrdQn

MethodAgar diffusion

ClassABXBACT

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.44

Last changed2.44

Consumer names

Susceptibility to Ormetroprim+Sulfamethoxazole

Part names

Ormetroprim+SulfamethoxazoleSuscPtIsolateOrdQnAgar diffusionSusceptibility (microorganisms)Point in time (spot)Disk diffusion (KB)

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.