Serum CO2

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Data Element (edit)
Field Name: Ap_SerCO2
CCMDB Label: not stated
CCMDB tab: Apache
Table: L_Log table
Data type: number
Length: single
Program: CC
Created/Raw: Raw
Start Date: 1988-07-11
End Date: 2300-01-01
Sort Index: 71

The patient's Serum CO2 level in mmol/L.

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Legacy implementation right in the table

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Collection instruction

Collect Serum CO2 only if an Arterial blood gas (APACHE) is not available. An ABG is preferred, but if no ABG available during the first 24 hours in ICU then collect serum CO2.

If no ABG and no serum CO2 available assume normal and record serum CO2 as 25.0.

Do not use venous gases.

Apache Physiological Variable
variable name Serum CO2
unit mmol/L
absolute max allowed 440
warning max 285
high score 4 ≥52
high score 3 >=41 and <52
high score 2
high score 1 >=32 and <41
score 0 >= 22 and <32
low score 1
low score 2 >=18 and <22
low score 3 >=15 and <18
low score 4 <15
AP phys warnMin 2
AP phys absMin 2


This value is used to generate the APACHE Score.

Collecting Apache physiological variables

There are some specific rules to follow in choosing which one of several lab results to collect.

See APACHE physiological variable collection for details.

Cross Chcks

Rules described in APACHE_physiological_variable_collection#Exceptionally_high_or_low_values are implemented by Check APACHE physiological variable high low.


For APACHE II scoring: the serum CO2 replaces pH and assumes normal oxygenation.

Serum CO2 is really a measure of serum HCO3-, also called bicarbonate. The procedure used to measure HCO3- in the laboratory first converts it to CO2. In the body, 95% of the CO2 is present as HCO3-, so most of what is measured in the laboratory represents HCO3-.

Data Integrity Checks

Data Integrity Checks (automatic list)

Check APACHE physiological variable high lowCCMDB.accdbimplemented

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