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 57997-9: Lopinavir+Ritonavir Phenotype method [Susc]

Name: LOINC Code 57997-9: Lopinavir+Ritonavir Phenotype method [Susc]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.758Z

57997-9 is a LOINC code used to identify Lopinavir+Ritonavir Phenotype method [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 Lopinavir+Ritonavir. 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 Lopinavir+Ritonavir. 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: Both
Method: Phenotyping

What it does not mean

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

Key facts

Lopinavir+Ritonavir [Susceptibility] by Phenotype method
Lopinavir+Ritonavir
ANTIBIOTIC SUSCEPTIBILITIES; AST; ID; Infectious Disease; InfectiousDisease; Islt; Isol; Kaletra; LPV; LPV/r; Norvir; Pheno; Phenotype; Phenotypic; Point in time; Random; RTV; Sus; Suscept; Susceptibilities; Susceptibility; Susceptibilty; Virtual Phenotype

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

Lopinavir+Ritonavir Phenotype method [Susc]Lopinavir+Ritonavir [Susceptibility] by Phenotype methodLopinavir+Ritonavir Islt PhenotypLopinavir+RitonavirABXBACTSusceptibility to Lopinavir+RitonavirSusc

Frequently asked questions

Code details

Code57997-9

SystemLOINC

Display nameLopinavir+Ritonavir Phenotype method [Susc]

DescriptionLopinavir+Ritonavir

Short nameLopinavir+Ritonavir Islt Phenotyp

ComponentLopinavir+Ritonavir

PropertySusc

TimingPt

System (specimen)Isolate

ScaleOrdQn

MethodPhenotyping

ClassABXBACT

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.29

Last changed2.29

Consumer names

Susceptibility to Lopinavir+Ritonavir

Part names

Lopinavir+RitonavirSuscPtIsolateOrdQnPhenotypingSusceptibility (microorganisms)Point in time (spot)Viral phenotype susceptibility

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.