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 74684-2: CO2 post dialysis [Moles/Vol]

Name: LOINC Code 74684-2: CO2 post dialysis [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

74684-2 is a LOINC code used to identify CO2 post dialysis [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 Carbon dioxide^post dialysis. 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 Carbon dioxide^post dialysis. 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: ACTIVE
Order vs observation: Both

What it does not mean

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

Key facts

Carbon dioxide, total [Moles/volume] in Serum or Plasma --post dialysis
Carbon dioxide^post dialysis
After; Carbonic anhydride; cCO2; Chemistry; CO2; CO2 TOTAL; CO2CT; ctCO2; Dialy; Level; p dialysis; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Substance concentration; tCO2

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 CO2 post dialysis [Moles/Vol] (74684-2)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

CO2 post dialysis [Moles/Vol]Carbon dioxide, total [Moles/volume] in Serum or Plasma --post dialysisCO2 p dialysis SerPl-sCncCarbon dioxide^post dialysisCHEMCarbon Dioxide (CO2) after Dialysis, BloodSCnc

Frequently asked questions

Code details

Code74684-2

SystemLOINC

Display nameCO2 post dialysis [Moles/Vol]

DescriptionCarbon dioxide^post dialysis

Short nameCO2 p dialysis SerPl-sCnc

ComponentCarbon dioxide^post dialysis

PropertySCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsmmol/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.48

Last changed2.48

Consumer names

Carbon Dioxide (CO2) after Dialysis, Blood

Part names

Carbon dioxide^post dialysisSCncPtSer/PlasQnSubstance 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.