LOINCActiveBoth

LOINC Code 35685-7: CO2 Unsp time (U) [Moles/Vol]

35685-7 is a LOINC code used to identify CO2 Unsp time (U) [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. It is commonly used with the system or sample type Urine.

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 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 [Moles/volume] in Urine collected for unspecified duration
  • Carbon dioxide
  • ?Tm; Carbonic anhydride; cCO2; Chemistry; CO2; CO2 TOTAL; CO2CT; ctCO2; Level; QNT; Quan; Quant; Quantitative; Substance Concentration; tCO2; 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 Unsp time (U) [Moles/Vol]Carbon dioxide [Moles/volume] in Urine collected for unspecified durationCO2 ?Tm Ur-sCncCarbon dioxideCHEMCarbon Dioxide (CO2), UrineSCnc

Frequently asked questions

Code details

Code35685-7
SystemLOINC
Display nameCO2 Unsp time (U) [Moles/Vol]
DescriptionCarbon dioxide
Short nameCO2 ?Tm Ur-sCnc
ComponentCarbon dioxide
PropertySCnc
TimingXXX
System (specimen)Urine
ScaleQn
ClassCHEM
Example unitsnmol/L
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.13
Last changed2.70

Consumer names

Carbon Dioxide (CO2), Urine

Part names

Carbon dioxideSCncXXXUrineQnSubstance ConcentrationUnspecified

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 35685-7 | HealthAssure