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 73809-6: B cell+T cell crossmatch Complement dependent cytotoxicity Ql (S+Bld) [Interp]

Name: LOINC Code 73809-6: B cell+T cell crossmatch Complement dependent cytotoxicity Ql (S+Bld) [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:52.636Z

73809-6 is a LOINC code used to identify B cell+T cell crossmatch Complement dependent cytotoxicity Ql (S+Bld) [Interp] 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 B cell+T cell crossmatch. It is commonly used with the system or sample type Ser+Bld.

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 B cell+T cell crossmatch. It is commonly used with the system or sample type Ser+Bld.

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: Complement dependent cytotoxicity

What it does not mean

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

Key facts

B cell+T cell crossmatch [Interpretation] Qualitative by Complement dependent cytotoxicity
B cell+T cell crossmatch
B+T cell; B+T cell XM; B-ALL; B-cell acute lymphoblastic leukemia; BCELLS; Blood; BLOOD BANK; Both serum and blood; CDC; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Ordinal; Point in time; QL; Qual; Qualitative; Random; Screen; SerBld; Serum; Serum or whole blood; SR; T Cell XM; T prime; UCHL-1; WB; Whole blood

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

B cell+T cell crossmatch Complement dependent cytotoxicity Ql (S+Bld) [Interp]B cell+T cell crossmatch [Interpretation] Qualitative by Complement dependent cytotoxicityB+T cell XM Ser+Bld CDC-ImpB cell+T cell crossmatchBLDBKB cell+T cell crossmatch, Serum+BloodImp

Frequently asked questions

Code details

Code73809-6

SystemLOINC

Display nameB cell+T cell crossmatch Complement dependent cytotoxicity Ql (S+Bld) [Interp]

DescriptionB cell+T cell crossmatch

Short nameB+T cell XM Ser+Bld CDC-Imp

ComponentB cell+T cell crossmatch

PropertyImp

TimingPt

System (specimen)Ser+Bld

ScaleOrd

MethodComplement dependent cytotoxicity

ClassBLDBK

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.44

Last changed2.56

Consumer names

B cell+T cell crossmatch, Serum+Blood

Part names

B cell+T cell crossmatchImpPtSer+BldOrdComplement dependent cytotoxicityImpression/interpretation of studyPoint in time (spot)Serum and Blood

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.