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.

LOINCBoth

LOINC Code 35227-8: TBG [Mass or moles/Vol]

Name: LOINC Code 35227-8: TBG [Mass or moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

35227-8 is a LOINC code used to identify TBG [Mass or moles/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 Thyroxine binding globulin. 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 Thyroxine binding globulin. 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: DISCOURAGED
Order vs observation: Both

What it does not mean

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

Key facts

Thyroxine binding globulin [Mass or Moles/volume] in Serum or Plasma
Thyroxine binding globulin
Bind; Chemistry; GLB; Glob; Glob%; Globul; Globulins; Level; Levothyroxine; Levo-thyroxine; L-thyroxine; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; T4; T-4; T4BG; TBG; thyroid hormone; Thyrox; Thyroxin; Thyrx; Total T4; TT4

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 TBG [Mass or moles/Vol] (35227-8)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

TBG [Mass or moles/Vol]Thyroxine binding globulin [Mass or Moles/volume] in Serum or PlasmaT4BG SerPl-msCncThyroxine binding globulinCHEMTBG, BloodMSCnc

Frequently asked questions

Code details

Code35227-8

SystemLOINC

Display nameTBG [Mass or moles/Vol]

DescriptionThyroxine binding globulin

Short nameT4BG SerPl-msCnc

ComponentThyroxine binding globulin

PropertyMSCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

StatusDISCOURAGED

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.11

Last changed2.42

Consumer names

TBG, Blood

Part names

Thyroxine binding globulinMSCncPtSer/PlasQnMass or Substance 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.