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 49924-4: ALP macro [Catalytic fraction]

Name: LOINC Code 49924-4: ALP macro [Catalytic fraction]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

49924-4 is a LOINC code used to identify ALP macro [Catalytic fraction] 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.macro/Alkaline phosphatase.total. It is commonly used with the system or sample type Ser/Plas.

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.macro/Alkaline phosphatase.total. It is commonly used with the system or sample type Ser/Plas.

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.macro/Alkaline phosphatase.total in Serum or Plasma
Alkaline phosphatase.macro/Alkaline phosphatase.total
Alk; Alk phos; Alkaline phos; Alkaline phosphatase.total; ALKP; ALP; ALP macro; AP; Catalytic Fraction; Chemistry; Percent; Phos; Phosphtase; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Tot; Totl

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 macro [Catalytic fraction] (49924-4)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

ALP macro [Catalytic fraction]Alkaline phosphatase.macro/Alkaline phosphatase.total in Serum or PlasmaALP macro CFr SerPlAlkaline phosphatase.macro/Alkaline phosphatase.totalCHEMMacro alkaline phosphatase, BloodCFr

Frequently asked questions

Code details

Code49924-4

SystemLOINC

Display nameALP macro [Catalytic fraction]

DescriptionAlkaline phosphatase.macro/Alkaline phosphatase.total

Short nameALP macro CFr SerPl

ComponentAlkaline phosphatase.macro/Alkaline phosphatase.total

PropertyCFr

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example units%

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.70

Consumer names

Macro alkaline phosphatase, Blood

Part names

Alkaline phosphatase.macro/Alkaline phosphatase.totalCFrPtSer/PlasQnCatalytic FractionPoint in time (spot)Serum or Plasma

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.