LOINCActiveObservation

LOINC Code 346-7: Nafcillin MLC [Susc]

346-7 is a LOINC code used to identify Nafcillin 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 Nafcillin. 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 Nafcillin. 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

  • Nafcillin [Susceptibility] by Minimum lethal concentration (MLC)
  • Nafcillin
  • ANTIBIOTIC SUSCEPTIBILITIES; AST; ID; Infectious Disease; InfectiousDisease; Islt; Isol; MBC; Minimum bactericidal concentration; Minimum lethal concentration; NAFJ; Point in time; QNT; Quan; Quant; Quantitative; Random; Sus; Suscept; Susceptibilities; Susceptibility; Susceptibilty; Unipen

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

Nafcillin MLC [Susc]Nafcillin [Susceptibility] by Minimum lethal concentration (MLC)Nafcillin Islt MLCNafcillinABXBACTSusceptibility to NafcillinSusc

Frequently asked questions

Code details

Code346-7
SystemLOINC
Display nameNafcillin MLC [Susc]
DescriptionNafcillin
Short nameNafcillin Islt MLC
ComponentNafcillin
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 Nafcillin

Part names

NafcillinSuscPtIsolateQnMLCSusceptibility (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 346-7 | HealthAssure