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 16320-4: Acyclovir SBT (Isol+S)

Name: LOINC Code 16320-4: Acyclovir SBT (Isol+S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:26.376Z

16320-4 is a LOINC code used to identify Acyclovir SBT (Isol+S) 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 Acyclovir. It is commonly used with the system or sample type Isolate+Ser.

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 Acyclovir. It is commonly used with the system or sample type Isolate+Ser.

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: SBT

What it does not mean

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

Key facts

Acyclovir [Susceptibility] by Serum bactericidal titer
Acyclovir
Aciclovir; Acifur; ACV; Acycloguanosine; ANTIBIOTIC SUSCEPTIBILITIES; Avirax; Dilution factor; Dilution Factor (Titer); ID; Infectious Disease; InfectiousDisease; Islt; Isol; Point in time; Random; Sequence based typing; Serum; SERUM BACTERICIDAL TITER; Serum killing test; SmQn; SR; Titer; Titered; Titre; Ttr; Zovirax

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

Acyclovir SBT (Isol+S)Acyclovir [Susceptibility] by Serum bactericidal titerAcyclovir Titr SBTAcyclovirABXBACTSusceptibility to AcyclovirTitr

Frequently asked questions

Code details

Code16320-4

SystemLOINC

Display nameAcyclovir SBT (Isol+S)

DescriptionAcyclovir

Short nameAcyclovir Titr SBT

ComponentAcyclovir

PropertyTitr

TimingPt

System (specimen)Isolate+Ser

ScaleSemiQn

MethodSBT

ClassABXBACT

Example unitstiter

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.75

Consumer names

Susceptibility to Acyclovir

Part names

AcyclovirTitrPtIsolate+SerSemiQnSBTTiterPoint in time (spot)Isolate and SerumSerum bactericidal titer

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.