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 4535-1: Cytotoxic percent reactive Ab Quick method Ql (S)

Name: LOINC Code 4535-1: Cytotoxic percent reactive Ab Quick method Ql (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:30.176Z

4535-1 is a LOINC code used to identify Cytotoxic percent reactive Ab Quick method Ql (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 Cytotoxic percent reactive Ab. It is commonly used with the system or sample type 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 Cytotoxic percent reactive Ab. It is commonly used with the system or sample type 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: Both
Method: Quick method

What it does not mean

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

Key facts

Cytotoxic percent reactive Ab [Presence] in Serum by Quick method
Cytotoxic percent reactive Ab
A substrate looking for acid phosphatase
ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Ctox Pct React; HEMATOLOGY/CELL COUNTS; Ordinal; Point in time; PR; PRA; Qck; Ql; Qual; Qualitative; Random; Reac; React; Screen; Serum; 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

Cytotoxic percent reactive Ab Quick method Ql (S)Cytotoxic percent reactive Ab [Presence] in Serum by Quick methodCtox Pct React Ab Ser Ql QckCytotoxic percent reactive AbHEM/BCCytotoxic percent reactive antibody, BloodPrThr

Frequently asked questions

Code details

Code4535-1

SystemLOINC

Display nameCytotoxic percent reactive Ab Quick method Ql (S)

DescriptionCytotoxic percent reactive Ab

Short nameCtox Pct React Ab Ser Ql Qck

ComponentCytotoxic percent reactive Ab

PropertyPrThr

TimingPt

System (specimen)Ser

ScaleOrd

MethodQuick method

ClassHEM/BC

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.56

Consumer names

Cytotoxic percent reactive antibody, Blood

Part names

Cytotoxic percent reactive AbPrThrPtSerOrdQuick methodPresence or ThresholdPoint in time (spot)Serum

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.