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LOINC Code 96976-6: Carbon dioxide end tidal baseline - sub-maximal exercise delta

96976-6 is a LOINC code used to identify Carbon dioxide end tidal baseline - sub-maximal exercise delta 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^at end expiration-Carbon dioxide^at end expiration+W sub-maximal exercise. It is commonly used with the system or sample type Exhl gas.

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^at end expiration-Carbon dioxide^at end expiration+W sub-maximal exercise. It is commonly used with the system or sample type Exhl gas.

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: Observation

What it does not mean

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

Key facts

Carbon dioxide end tidal baseline - sub-maximal exercise delta
Carbon dioxide^at end expiration-Carbon dioxide^at end expiration+W sub-maximal exercise
Evaluating the difference between end tidal carbon dioxide (ET CO2) levels before and after submaximal exercise can distinguish healthy patients from those with pulmonary arterial hypertension (PAH), as well as determine the severity of PAH. [PMID21622009]
Breath; Carbonic anhydride; CARDIO-PULM; CO2; ET CO2 Diff - Submax Card/Pul exercise; ETCO2; EXCZ; ExG; Exhaled gas; Exhaled gas (=breath); Exp; Gases; Lung; Point in time; PULMONARY; Pulmonology; QNT; Quan; Quant; Quantitative; Random; Respiratory; SHAPE; Submaximal Heart And Pulmonary Evaluation

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

Carbon dioxide end tidal baseline - sub-maximal exercise deltapCO2 baseline-SubMx Exer deltaCarbon dioxide^at end expiration-Carbon dioxide^at end expiration+W sub-maximal exerciseCARDIO-PULMPPresDiffPtExhl gas

Frequently asked questions

Code details

Code96976-6
SystemLOINC
Display nameCarbon dioxide end tidal baseline - sub-maximal exercise delta
DescriptionCarbon dioxide^at end expiration-Carbon dioxide^at end expiration+W sub-maximal exercise
Short namepCO2 baseline-SubMx Exer delta
ComponentCarbon dioxide^at end expiration-Carbon dioxide^at end expiration+W sub-maximal exercise
PropertyPPresDiff
TimingPt
System (specimen)Exhl gas
ScaleQn
ClassCARDIO-PULM
Example unitsmm[Hg]
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

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

Part names

Carbon dioxide^at end expiration-Carbon dioxide^at end expiration+W sub-maximal exercisePPresDiffPtExhl gasQnPartial pressure differencePoint in time (spot)Exhaled gas

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 96976-6 | HealthAssure