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 53921-3: Thyroglobulin Ab Qn (Lymph node fine needle aspirate)

Name: LOINC Code 53921-3: Thyroglobulin Ab Qn (Lymph node fine needle aspirate)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

53921-3 is a LOINC code used to identify Thyroglobulin Ab Qn (Lymph node fine needle aspirate) 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 Thyroglobulin Ab. It is commonly used with the system or sample type Lymph node.FNA.

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 Thyroglobulin Ab. It is commonly used with the system or sample type Lymph node.FNA.

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

Thyroglobulin Ab [Units/volume] in Lymph node fine needle aspirate
Thyroglobulin Ab
ABS; Aby; Antby; Anti; Antibodies; Antibody; Antithyroglob; Arbitrary concentration; Autoantibodies; Autoantibody; Endocrine; Endocrinology; Fine needle; Hashimoto's thyroiditis; Ln; LN FNA; Point in time; QNT; Quan; Quant; Quantitative; Random; Serology; Tg; TgAbs; Thyglobulin; Thyroglbn; Thyroglob; Tumor marker

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 Thyroglobulin Ab Qn (Lymph node fine needle aspirate) (53921-3)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Thyroglobulin Ab Qn (Lymph node fine needle aspirate)Thyroglobulin Ab [Units/volume] in Lymph node fine needle aspirateThyroglob Ab LN FNA-aCncThyroglobulin AbSEROThyroglobulin antibody, Lymph node fine needle aspirateACnc

Frequently asked questions

Code details

Code53921-3

SystemLOINC

Display nameThyroglobulin Ab Qn (Lymph node fine needle aspirate)

DescriptionThyroglobulin Ab

Short nameThyroglob Ab LN FNA-aCnc

ComponentThyroglobulin Ab

PropertyACnc

TimingPt

System (specimen)Lymph node.FNA

ScaleQn

ClassSERO

Example unitsarb U/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.26

Last changed2.70

Consumer names

Thyroglobulin antibody, Lymph node fine needle aspirate

Part names

Thyroglobulin AbACncPtLymph node.FNAQnArbitrary ConcentrationPoint in time (spot)Lymph node FNA

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.