LOINCActiveBoth

LOINC Code 32306-3: CO2 (U) [Partial pressure]

32306-3 is a LOINC code used to identify CO2 (U) [Partial pressure] 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. It is commonly used with the system or sample type Urine.

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. It is commonly used with the system or sample type Urine.

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 [Partial pressure] in Urine
  • Carbon dioxide
  • Carbonic anhydride; Chemistry; CO2; Lung; Partial pressure; PCO2; Point in time; Pulmonary; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Respiratory; UA; UR; Urn

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

CO2 (U) [Partial pressure]Carbon dioxide [Partial pressure] in UrinepCO2 UrCarbon dioxideCHEMCarbon Dioxide (CO2), UrinePPres

Frequently asked questions

Code details

Code32306-3
SystemLOINC
Display nameCO2 (U) [Partial pressure]
DescriptionCarbon dioxide
Short namepCO2 Ur
ComponentCarbon dioxide
PropertyPPres
TimingPt
System (specimen)Urine
ScaleQn
ClassCHEM
Example unitsmm Hg
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.07
Last changed2.73

Consumer names

Carbon Dioxide (CO2), Urine

Part names

Carbon dioxidePPresPtUrineQnPartial pressurePoint in time (spot)

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.

LOINC Code 32306-3 | HealthAssure