Serum CO2: Difference between revisions
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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 | {{APACHE physiological variable | ||
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== Background == | |||
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-. | |||
[[Category:APACHE II Physiological Variables]] | [[Category:APACHE II Physiological Variables]] | ||
Revision as of 14:26, 2017 January 8
| Data Element (edit) | |
| Field Name: | Ap_SerCO2 |
| CCMDB Label: | not stated |
| CCMDB tab: | not stated |
| Table: | L_Log |
| 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.
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 |
APACHE Score
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.
Background
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-.