LOINCActiveObservation

LOINC Code 516-5: Trimethoprim+Sulfamethoxazole MIC [Susc]

516-5 is a LOINC code used to identify Trimethoprim+Sulfamethoxazole MIC [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 Trimethoprim+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 Trimethoprim+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: MIC

What it does not mean

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

Key facts

  • Trimethoprim+Sulfamethoxazole [Susceptibility] by Minimum inhibitory concentration (MIC)
  • Trimethoprim+Sulfamethoxazole
  • Acetylsulfamethoxazole; ANTIBIOTIC SUSCEPTIBILITIES; AST; Bactrim; c202; c203; c223; c242; C61; C62; Cotrim; Cotrimoxazole; Co-trimoxazole; Gantanol; ID; Infectious Disease; InfectiousDisease; Islt; Isol; Minimum inhibitory concentration; Point in time; Polytrim; Primsol; Proloprim; Random; Septra; SMX; SMX-TMP; Sulfa; Sulfamethox; Sus; Suscept; Susceptibilities; Susceptibility; Susceptibilty; SXT; TMP; TMP SMX; TMP-SMX; Trimeth; Trimpex

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

Trimethoprim+Sulfamethoxazole MIC [Susc]Trimethoprim+Sulfamethoxazole [Susceptibility] by Minimum inhibitory concentration (MIC)TMP SMX Islt MICTrimethoprim+SulfamethoxazoleABXBACTSusceptibility to Trimethoprim+SulfamethoxazoleSusc

Frequently asked questions

Code details

Code516-5
SystemLOINC
Display nameTrimethoprim+Sulfamethoxazole MIC [Susc]
DescriptionTrimethoprim+Sulfamethoxazole
Short nameTMP SMX Islt MIC
ComponentTrimethoprim+Sulfamethoxazole
PropertySusc
TimingPt
System (specimen)Isolate
ScaleOrdQn
MethodMIC
ClassABXBACT
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0
Last changed2.73

Consumer names

Susceptibility to Trimethoprim+Sulfamethoxazole

Part names

Trimethoprim+SulfamethoxazoleSuscPtIsolateOrdQnMICSusceptibility (microorganisms)Point in time (spot)Minimum inhibitory concentration (MIC)

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.