LOINCActiveObservation

LOINC Code 18298-0: High titer low avidity Ab Ql

18298-0 is a LOINC code used to identify High titer low avidity Ab Ql 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 High titer low avidity Ab. It is commonly used with the system or sample type Ser/Plas.

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 High titer low avidity Ab. It is commonly used with the system or sample type Ser/Plas.

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

What it does not mean

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

Key facts

  • High titer low avidity Ab [Presence] in Serum or Plasma
  • High titer low avidity Ab
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; BLOOD BANK; HTLA; Ordinal; Pl; Plasma; Plsm; Point in time; PR; QL; Qual; Qualitative; Random; Screen; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR

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

High titer low avidity Ab QlHigh titer low avidity Ab [Presence] in Serum or PlasmaHTLA Ab SerPl QlHigh titer low avidity AbBLDBKHigh titer low avidity antibody, BloodPrThr

Frequently asked questions

Code details

Code18298-0
SystemLOINC
Display nameHigh titer low avidity Ab Ql
DescriptionHigh titer low avidity Ab
Short nameHTLA Ab SerPl Ql
ComponentHigh titer low avidity Ab
PropertyPrThr
TimingPt
System (specimen)Ser/Plas
ScaleOrd
ClassBLDBK
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0l
Last changed2.56

Consumer names

High titer low avidity antibody, Blood

Part names

High titer low avidity AbPrThrPtSer/PlasOrdPresence or ThresholdPoint in time (spot)Serum or Plasma

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 18298-0 | HealthAssure