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.

LOINCObservation

LOINC Code 39778-6: Iron/TIBC [Molar ratio]

Name: LOINC Code 39778-6: Iron/TIBC [Molar ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:26.653Z

39778-6 is a LOINC code used to identify Iron/TIBC [Molar ratio] 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 Iron/Iron binding capacity.total. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 21 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 Iron/Iron binding capacity.total. 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: Observation

What it does not mean

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

Key facts

Iron/Iron binding capacity.total [Molar ratio] in Serum or Plasma
Iron/Iron binding capacity.total
Bind; Chemistry; dTIBC; Fe; IBC; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; Scrto; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Substance concentration ratio; Substance ratio; TC; TIBC; Tot; Total iron binding; Totl

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

Iron/TIBC [Molar ratio]Iron/Iron binding capacity.total [Molar ratio] in Serum or PlasmaIron/TIBC SerPl-sRtoIron/Iron binding capacity.totalCHEMIron/Iron Binding Capacity.total, BloodSRto

Frequently asked questions

Code details

Code39778-6

SystemLOINC

Display nameIron/TIBC [Molar ratio]

DescriptionIron/Iron binding capacity.total

Short nameIron/TIBC SerPl-sRto

ComponentIron/Iron binding capacity.total

PropertySRto

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example units%

StatusDISCOURAGED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.15

Last changed2.73

Consumer names

Iron/Iron Binding Capacity.total, Blood

Part names

Iron/Iron binding capacity.totalSRtoPtSer/PlasQnSubstance RatioPoint 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.