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LOINC Code 2644-3: Alpha-N-acetylglucosaminidase (U) [Catalytic activity/Vol]

2644-3 is a LOINC code used to identify Alpha-N-acetylglucosaminidase (U) [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-N-acetylglucosaminidase. It is commonly used with the system or sample type Urine.

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-N-acetylglucosaminidase. It is commonly used with the system or sample type Urine.

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-N-acetylglucosaminidase [Enzymatic activity/volume] in Urine
  • Alpha-N-acetylglucosaminidase
  • Alfa; A-NAG; Catalytic Concentration; Chemistry; MPS III B; n-acetyl-acetylglucosaminidase; n-acetyl-alpha-d-glucosaminidase; n-acetyl-d-glucosaminidase; NAG; Point in time; QNT; Quan; Quant; Quantitative; Random; Sanfilippo disease, type B; UA; UR; Urn

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

Alpha-N-acetylglucosaminidase (U) [Catalytic activity/Vol]Alpha-N-acetylglucosaminidase [Enzymatic activity/volume] in UrineA-NAG Ur-cCncAlpha-N-acetylglucosaminidaseCHEMAlpha-N-acetylglucosaminidase, UrineCCnc

Frequently asked questions

Code details

Code2644-3
SystemLOINC
Display nameAlpha-N-acetylglucosaminidase (U) [Catalytic activity/Vol]
DescriptionAlpha-N-acetylglucosaminidase
Short nameA-NAG Ur-cCnc
ComponentAlpha-N-acetylglucosaminidase
PropertyCCnc
TimingPt
System (specimen)Urine
ScaleQn
ClassCHEM
Example unitsnmol/h/mL
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0
Last changed2.70

Consumer names

Alpha-N-acetylglucosaminidase, Urine

Part names

Alpha-N-acetylglucosaminidaseCCncPtUrineQnCatalytic ConcentrationPoint in time (spot)

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.