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 53139-2: Calcium.ionized adjusted to pH 7.4 (BldC) [Moles/Vol]

Name: LOINC Code 53139-2: Calcium.ionized adjusted to pH 7.4 (BldC) [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

53139-2 is a LOINC code used to identify Calcium.ionized adjusted to pH 7.4 (BldC) [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 Calcium.ionized^^adjusted to pH 7.4. It is commonly used with the system or sample type BldC.

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 Calcium.ionized^^adjusted to pH 7.4. It is commonly used with the system or sample type BldC.

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

Calcium.ionized [Moles/volume] adjusted to pH 7.4 in Capillary blood
Calcium.ionized^^adjusted to pH 7.4
adj; adj pH7.4; Blood - capillary; Ca; Ca-I; Cal; Calcium active; Calcium free; Cap bld; Cap blood; Capillary bld; Capillary blood; Chemistry; Coagulation factor I; Finger stick; ICA; Ion; Level; Point in time; QNT; Quan; Quant; Quantitative; Random; Substance concentration

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 Calcium.ionized adjusted to pH 7.4 (BldC) [Moles/Vol] (53139-2)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Calcium.ionized adjusted to pH 7.4 (BldC) [Moles/Vol]Calcium.ionized [Moles/volume] adjusted to pH 7.4 in Capillary bloodCa-I adj pH7.4 BldC-sCncCalcium.ionized^^adjusted to pH 7.4CHEMCalcium.ionized Adjusted to pH 7.4, BloodSCnc

Frequently asked questions

Code details

Code53139-2

SystemLOINC

Display nameCalcium.ionized adjusted to pH 7.4 (BldC) [Moles/Vol]

DescriptionCalcium.ionized^^adjusted to pH 7.4

Short nameCa-I adj pH7.4 BldC-sCnc

ComponentCalcium.ionized^^adjusted to pH 7.4

PropertySCnc

TimingPt

System (specimen)BldC

ScaleQn

ClassCHEM

Example unitsnmol/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.24

Last changed2.42

Consumer names

Calcium.ionized Adjusted to pH 7.4, Blood

Part names

Calcium.ionized^^adjusted to pH 7.4SCncPtBldCQnSubstance ConcentrationPoint in time (spot)Blood capillary

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.