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 33638-8: Lymphocyte proliferation stimulated by phytohemagglutinin (Bld) [Mass/Vol]

Name: LOINC Code 33638-8: Lymphocyte proliferation stimulated by phytohemagglutinin (Bld) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:21.183Z

33638-8 is a LOINC code used to identify Lymphocyte proliferation stimulated by phytohemagglutinin (Bld) [Mass/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 Lymphocyte proliferation.phytohemagglutinin stimulation. It is commonly used with the system or sample type 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 Lymphocyte proliferation.phytohemagglutinin stimulation. 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: Both

What it does not mean

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

Key facts

Lymphocyte proliferation stimulated by phytohemagglutinin [Mass/volume] in Blood
Lymphocyte proliferation.phytohemagglutinin stimulation
Lymphocyte responsiveness to concanavalin A, phytohemagglutinin and pokeweed mitogen is determined. Impaired responses to these mitogens are encountered in immunodeficiency diseases, certain infections and possibly in cancer.
Blood; Level; LPA; LPT; LPT PHA; LST; Lymphocyte antigen proliferation; Lymphocyte antigen stimulation; Mass concentration; PHA; PHA mitogen stimulation; Point in time; QNT; Quan; Quant; Quantitative; Random; Serology; Stim; 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

Lymphocyte proliferation stimulated by phytohemagglutinin (Bld) [Mass/Vol]Lymphocyte proliferation stimulated by phytohemagglutinin [Mass/volume] in BloodLPT PHA Bld-mCncLymphocyte proliferation.phytohemagglutinin stimulationSEROLymphocyte proliferation stimulated by phytohemagglutinin, BloodMCnc

Frequently asked questions

Code details

Code33638-8

SystemLOINC

Display nameLymphocyte proliferation stimulated by phytohemagglutinin (Bld) [Mass/Vol]

DescriptionLymphocyte proliferation.phytohemagglutinin stimulation

Short nameLPT PHA Bld-mCnc

ComponentLymphocyte proliferation.phytohemagglutinin stimulation

PropertyMCnc

TimingPt

System (specimen)Bld

ScaleQn

ClassSERO

Example unitspg/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.09

Last changed2.73

Consumer names

Lymphocyte proliferation stimulated by phytohemagglutinin, Blood

Part names

Lymphocyte proliferation.phytohemagglutinin stimulationMCncPtBldQnLymphocyte proliferation Phytohemagglutinin StimulationMass ConcentrationPoint 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.