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 13944-4: Leukocyte phosphatase LM (WBC control) [Catalytic activity/Vol]

Name: LOINC Code 13944-4: Leukocyte phosphatase LM (WBC control) [Catalytic activity/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:24.419Z

13944-4 is a LOINC code used to identify Leukocyte phosphatase LM (WBC control) [Catalytic activity/Vol] 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 Phosphatase.leukocyte. It is commonly used with the system or sample type WBC^Control.

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 Phosphatase.leukocyte. It is commonly used with the system or sample type WBC^Control.

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: Microscopy.light

What it does not mean

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

Key facts

Leukocyte phosphatase [Enzymatic activity/volume] in Control Leukocytes by Light microscopy
Phosphatase.leukocyte
Catalytic Concentration; Contrl; HEMATOLOGY/CELL COUNTS; LAP; Leuc; Leuk; Leukocyte alkaline phosphatase; Leukocytes; Lkcs; LM; Micro; Micros; Microscopic; NAT; Neutrophil alkaline phosphatase; Normal; Phos; Phosphtase; Point in time; QNT; Quan; Quant; Quantitative; Random; WBC; WBCs; White blood cell; White blood 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

Leukocyte phosphatase LM (WBC control) [Catalytic activity/Vol]Leukocyte phosphatase [Enzymatic activity/volume] in Control Leukocytes by Light microscopyLAP WBC Cont Micro-cCncPhosphatase.leukocyteHEM/BCLeukocyte phosphatase, control White blood cellsCCnc

Frequently asked questions

Code details

Code13944-4

SystemLOINC

Display nameLeukocyte phosphatase LM (WBC control) [Catalytic activity/Vol]

DescriptionPhosphatase.leukocyte

Short nameLAP WBC Cont Micro-cCnc

ComponentPhosphatase.leukocyte

PropertyCCnc

TimingPt

System (specimen)WBC^Control

ScaleQn

MethodMicroscopy.light

ClassHEM/BC

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0k

Last changed2.73

Consumer names

Leukocyte phosphatase, control White blood cells

Part names

Phosphatase.leukocyteCCncPtWBC^controlQnMicroscopy.lightLeukocyte phosphataseCatalytic ConcentrationPoint in time (spot)Light microscopy

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.