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 1677-4: Alpha hydroxybutyrate dehydrogenase [Catalytic activity/Vol]

Name: LOINC Code 1677-4: Alpha hydroxybutyrate dehydrogenase [Catalytic activity/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

1677-4 is a LOINC code used to identify Alpha hydroxybutyrate dehydrogenase [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 hydroxybutyrate dehydrogenase. 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 Alpha hydroxybutyrate dehydrogenase. 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

Alpha hydroxybutyrate dehydrogenase [Enzymatic activity/volume] in Serum or Plasma
Alpha hydroxybutyrate dehydrogenase
2-hydroxybutyrate; 2-hydroxybutyrate dehydrogenase; 2-hydroxybutyric acid; Alfa; Alpha hydroxy butyrate; A-OH-Butyr; A-OH-Butyr Dehydrog; Catalytic Concentration; Chemistry; Dehydrog; Dehyrdogenase; HBD; HBDH; Hydroxybutyric acid; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR

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 hydroxybutyrate dehydrogenase [Catalytic activity/Vol] (1677-4)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Alpha hydroxybutyrate dehydrogenase [Catalytic activity/Vol]Alpha hydroxybutyrate dehydrogenase [Enzymatic activity/volume] in Serum or PlasmaA-OH-Butyr Dehydrog SerPl-cCncAlpha hydroxybutyrate dehydrogenaseCHEMAlpha hydroxybutyrate dehydrogenase, BloodCCnc

Frequently asked questions

Code details

Code1677-4

SystemLOINC

Display nameAlpha hydroxybutyrate dehydrogenase [Catalytic activity/Vol]

DescriptionAlpha hydroxybutyrate dehydrogenase

Short nameA-OH-Butyr Dehydrog SerPl-cCnc

ComponentAlpha hydroxybutyrate dehydrogenase

PropertyCCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsarb U/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.68

Consumer names

Alpha hydroxybutyrate dehydrogenase, Blood

Part names

Alpha hydroxybutyrate dehydrogenaseCCncPtSer/PlasQnCatalytic ConcentrationPoint 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.