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LOINC Code 12466-9: Alpha 1 antitrypsin Nephelometry (Amn fld) [Mass/Vol]

12466-9 is a LOINC code used to identify Alpha 1 antitrypsin Nephelometry (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 Alpha 1 antitrypsin. 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 Alpha 1 antitrypsin. 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: ACTIVE
  • Order vs observation: Both
  • Method: Nephelometry

What it does not mean

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

Key facts

  • Alpha 1 antitrypsin [Mass/volume] in Amniotic fluid by Nephelometry
  • Alpha 1 antitrypsin
  • A1; A1A; A1AT; A-1-AT; A1-AT; AAT; AF; Alfa; Alpha-1-antitrypsin.total; Alpha-1-protease inhibitor; Alpha-1-proteinase inhibitor; Alpha-1-trypsin inhibitor; Amn; Amn fl; Amnio; Amniotic flu; Amniotic fluid; Chemistry; Gyn; Gynecology; i; Level; Light scattering; Mass concentration; Nephelom; OB; ObGyn; Obstetrics; 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

Alpha 1 antitrypsin Nephelometry (Amn fld) [Mass/Vol]Alpha 1 antitrypsin [Mass/volume] in Amniotic fluid by NephelometryA1AT Amn Neph-mCncAlpha 1 antitrypsinCHEMAlpha 1 antitrypsin, Amniotic fluidMCnc

Frequently asked questions

Code details

Code12466-9
SystemLOINC
Display nameAlpha 1 antitrypsin Nephelometry (Amn fld) [Mass/Vol]
DescriptionAlpha 1 antitrypsin
Short nameA1AT Amn Neph-mCnc
ComponentAlpha 1 antitrypsin
PropertyMCnc
TimingPt
System (specimen)Amnio fld
ScaleQn
MethodNephelometry
ClassCHEM
Example unitsmg/dL
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0j-a
Last changed2.56

Consumer names

Alpha 1 antitrypsin, Amniotic fluid

Part names

Alpha 1 antitrypsinMCncPtAmnio fldQnNephelometryMass 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.