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 29639-2: ALP (Tiss) [Catalytic activity/Mass]

Name: LOINC Code 29639-2: ALP (Tiss) [Catalytic activity/Mass]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

29639-2 is a LOINC code used to identify ALP (Tiss) [Catalytic activity/Mass] 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 Alkaline phosphatase. It is commonly used with the system or sample type Tiss.

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 Alkaline phosphatase. It is commonly used with the system or sample type Tiss.

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

Alkaline phosphatase [Enzymatic activity/mass] in Tissue
Alkaline phosphatase
Alk; Alk phos; Alkaline phos; Alkaline phosphatase.total; ALKP; ALP; AP; Catalytic Content; Chemistry; Hepatology; Liver; MSK; Musculoskeletal; Ortho; Orthopedics; Phos; Phosphtase; Point in time; QNT; Quan; Quant; Quantitative; Random; Tissue; Tissue, unspecified

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 ALP (Tiss) [Catalytic activity/Mass] (29639-2)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

ALP (Tiss) [Catalytic activity/Mass]Alkaline phosphatase [Enzymatic activity/mass] in TissueALP Tiss-cCntAlkaline phosphataseCHEMAlkaline phosphatase, TissueCCnt

Frequently asked questions

Code details

Code29639-2

SystemLOINC

Display nameALP (Tiss) [Catalytic activity/Mass]

DescriptionAlkaline phosphatase

Short nameALP Tiss-cCnt

ComponentAlkaline phosphatase

PropertyCCnt

TimingPt

System (specimen)Tiss

ScaleQn

ClassCHEM

Example unitsU/g

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.03

Last changed2.73

Consumer names

Alkaline phosphatase, Tissue

Part names

Alkaline phosphataseCCntPtTissQnCatalytic ContentPoint in time (spot)Tissue and Smears

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.