LOINCActiveObservation

LOINC Code 511-6: Trimethoprim MLC [Susc]

511-6 is a LOINC code used to identify Trimethoprim MLC [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. 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. 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: MLC

What it does not mean

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

Key facts

  • Trimethoprim [Susceptibility] by Minimum lethal concentration (MLC)
  • Trimethoprim
  • ANTIBIOTIC SUSCEPTIBILITIES; AST; c202; c242; C62; ID; Infectious Disease; InfectiousDisease; Islt; Isol; MBC; Minimum bactericidal concentration; Minimum lethal concentration; Point in time; Polytrim; Primsol; Proloprim; QNT; Quan; Quant; Quantitative; Random; Sus; Suscept; Susceptibilities; Susceptibility; Susceptibilty; TMP; 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 MLC [Susc]Trimethoprim [Susceptibility] by Minimum lethal concentration (MLC)Trimethoprim Islt MLCTrimethoprimABXBACTSusceptibility to TrimethoprimSusc

Frequently asked questions

Code details

Code511-6
SystemLOINC
Display nameTrimethoprim MLC [Susc]
DescriptionTrimethoprim
Short nameTrimethoprim Islt MLC
ComponentTrimethoprim
PropertySusc
TimingPt
System (specimen)Isolate
ScaleQn
MethodMLC
ClassABXBACT
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0
Last changed2.19

Consumer names

Susceptibility to Trimethoprim

Part names

TrimethoprimSuscPtIsolateQnMLCSusceptibility (microorganisms)Point in time (spot)Minimum lethal concentration (MLC)

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.

LOINC Code 511-6 | HealthAssure