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 57439-2: Terminal deoxyribonucleotidyl transferase cells Ql (Body fld)

Name: LOINC Code 57439-2: Terminal deoxyribonucleotidyl transferase cells Ql (Body fld)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.756Z

57439-2 is a LOINC code used to identify Terminal deoxyribonucleotidyl transferase cells Ql (Body fld) 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 Cells.terminal deoxyribonucleotidyl transferase. It is commonly used with the system or sample type Body fld.

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 Cells.terminal deoxyribonucleotidyl transferase. It is commonly used with the system or sample type Body fld.

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

What it does not mean

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

Key facts

Terminal deoxyribonucleotidyl transferase cells [Presence] in Body fluid
Cells.terminal deoxyribonucleotidyl transferase
B/F; BF; bod; Bodies; Body fluid; Body fluid, unsp; Cell; CELL MARKERS; Cellularity; Fl; Fld; FLU; Fluid; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; TdT; TdT Cells

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

Terminal deoxyribonucleotidyl transferase cells Ql (Body fld)Terminal deoxyribonucleotidyl transferase cells [Presence] in Body fluidTdT Cells Fld QlCells.terminal deoxyribonucleotidyl transferaseCELLMARKTerminal deoxyribonucleotidyl transferase cells, Body fluidPrThr

Frequently asked questions

Code details

Code57439-2

SystemLOINC

Display nameTerminal deoxyribonucleotidyl transferase cells Ql (Body fld)

DescriptionCells.terminal deoxyribonucleotidyl transferase

Short nameTdT Cells Fld Ql

ComponentCells.terminal deoxyribonucleotidyl transferase

PropertyPrThr

TimingPt

System (specimen)Body fld

ScaleOrd

ClassCELLMARK

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.29

Last changed2.56

Consumer names

Terminal deoxyribonucleotidyl transferase cells, Body fluid

Part names

Cells.terminal deoxyribonucleotidyl transferasePrThrPtBody fldOrdTerminal deoxyribonucleotidyl transferase cellsPresence or ThresholdPoint in time (spot)Body fluid

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.