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 17840-0: Alpha-L-iduronidase (Bld) [Catalytic activity/Vol]

Name: LOINC Code 17840-0: Alpha-L-iduronidase (Bld) [Catalytic activity/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

17840-0 is a LOINC code used to identify Alpha-L-iduronidase (Bld) [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 Alpha-L-iduronidase. 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 Alpha-L-iduronidase. 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

Alpha-L-iduronidase [Enzymatic activity/volume] in Blood
Alpha-L-iduronidase
Alfa; Blood; Catalytic Concentration; Chemistry; Hurler disease; Left; Levo; Point in time; QNT; Quan; Quant; Quantitative; Random; Scheie disease; 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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Alpha-L-iduronidase (Bld) [Catalytic activity/Vol] (17840-0)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Alpha-L-iduronidase (Bld) [Catalytic activity/Vol]Alpha-L-iduronidase [Enzymatic activity/volume] in BloodA-L-Iduronidase Bld-cCncAlpha-L-iduronidaseCHEMAlpha-L-iduronidase, BloodCCnc

Frequently asked questions

Code details

Code17840-0

SystemLOINC

Display nameAlpha-L-iduronidase (Bld) [Catalytic activity/Vol]

DescriptionAlpha-L-iduronidase

Short nameA-L-Iduronidase Bld-cCnc

ComponentAlpha-L-iduronidase

PropertyCCnc

TimingPt

System (specimen)Bld

ScaleQn

ClassCHEM

Example unitsarb U/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.68

Consumer names

Alpha-L-iduronidase, Blood

Part names

Alpha-L-iduronidaseCCncPtBldQnCatalytic 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.