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 30420-4: Large granular lymphocytes/Leukocytes (Bld)

Name: LOINC Code 30420-4: Large granular lymphocytes/Leukocytes (Bld)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

30420-4 is a LOINC code used to identify Large granular lymphocytes/Leukocytes (Bld) 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 Lymphocytes.large granular/Leukocytes. It is commonly used with the system or sample type Bld.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Lymphocytes.large granular/Leukocytes. It is commonly used with the system or sample type 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: Observation

What it does not mean

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

Key facts

Large granular lymphocytes/Leukocytes in Blood
Lymphocytes.large granular/Leukocytes
Blood; HEMATOLOGY/CELL COUNTS; Leuc; Leuk; Leukocyte; Lg Gran Lymphs; LGL; Lkcs; Lymp; Lymph; Lympho; Lymphocyte; Lymphs; Lymphs%; Number fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; WB; WBC; WBCs; White blood cell; White blood cells; 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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Large granular lymphocytes/Leukocytes (Bld) (30420-4)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Large granular lymphocytes/Leukocytes (Bld)Large granular lymphocytes/Leukocytes in BloodLg Gran Lymphs NFr BldLymphocytes.large granular/LeukocytesHEM/BCLarge granular lymphocytes/White Blood Cells, BloodNFr

Frequently asked questions

Code details

Code30420-4

SystemLOINC

Display nameLarge granular lymphocytes/Leukocytes (Bld)

DescriptionLymphocytes.large granular/Leukocytes

Short nameLg Gran Lymphs NFr Bld

ComponentLymphocytes.large granular/Leukocytes

PropertyNFr

TimingPt

System (specimen)Bld

ScaleQn

ClassHEM/BC

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.04

Last changed2.79

Consumer names

Large granular lymphocytes/White Blood Cells, Blood

Part names

Lymphocytes.large granular/LeukocytesNFrPtBldQnNumber FractionPoint in time (spot)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.