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LOINC Code 16887-2: Gamma aminobutyrate (Amn fld) [Mass/Vol]

16887-2 is a LOINC code used to identify Gamma aminobutyrate (Amn fld) [Mass/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 Gamma aminobutyrate. It is commonly used with the system or sample type Amnio fld.

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 Gamma aminobutyrate. It is commonly used with the system or sample type Amnio fld.

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: DISCOURAGED
  • Order vs observation: Observation

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

  • Gamma aminobutyrate [Mass/volume] in Amniotic fluid
  • Gamma aminobutyrate
  • 4-aminobutanoic acid; 4-aminobutyrate; 4-aminobutyric acid; AF; Aminobutric; Aminobutyric; Amino-n-butyrate; Amn; Amn fl; Amnio; Amniotic flu; Amniotic fluid; Chemistry; GABA; Gamma aminobutyric acid; Gamma amino-butyric acid; Gamma amino-n-butyrate; Gamma amino-n-butyric acid; Level; Mass concentration; Piperidic acid; Point in time; QNT; Quan; Quant; Quantitative; Random

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

Gamma aminobutyrate (Amn fld) [Mass/Vol]Gamma aminobutyrate [Mass/volume] in Amniotic fluidGABA Amn-mCncGamma aminobutyrateCHEMGamma aminobutyrate, Amniotic fluidMCnc

Frequently asked questions

Code details

Code16887-2
SystemLOINC
Display nameGamma aminobutyrate (Amn fld) [Mass/Vol]
DescriptionGamma aminobutyrate
Short nameGABA Amn-mCnc
ComponentGamma aminobutyrate
PropertyMCnc
TimingPt
System (specimen)Amnio fld
ScaleQn
ClassCHEM
StatusDISCOURAGED
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0l
Last changed2.44

Consumer names

Gamma aminobutyrate, Amniotic fluid

Part names

Gamma aminobutyrateMCncPtAmnio fldQnMass ConcentrationPoint in time (spot)Amniotic fluid

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.