78354-8
ClinicalArterial-alveolar oxygen Partial pressure ratio
Definition
The arterial/alveolar oxygen tension ratio, also known as a/APO2, is a measure of gas-exchange. While it was originally believed to be less affected by the fraction of inspired oxygen (FiO2) compared to other measures such as the alveolar-arterial oxygen tension difference (PAO2-PaO2), the a/APO2 has been found to be somewhat dependent on FiO2, especially with higher degrees of pulmonary shunting. [PMID: 3742320]
LOINC 6-Axis Classification
Component
Oxygen.arterial/Oxygen.alveolar
Property
PPresRto
Time Aspect
Pt
System
BldA+Resp.alv
Scale Type
Qn
Method Type
Calculated
Details
Class
PULM
Order/Observation
Both
Short Name
a/A PO2 Rto
Related Names
Frequently Asked Questions
What is LOINC code 78354-8?
LOINC code 78354-8 identifies "Arterial-alveolar oxygen Partial pressure ratio". The arterial/alveolar oxygen tension ratio, also known as a/APO2, is a measure of gas-exchange. While it was originally believed to be less affected by the fraction of inspired oxygen (FiO2) compared to other measures such as the alveolar-arterial oxygen tension difference (PAO2-PaO2), the a/APO2 has been found to be somewhat dependent on FiO2, especially with higher degrees of pulmonary shunting. [PMID: 3742320]
What does 78354-8 measure?
This code measures Oxygen.arterial/Oxygen.alveolar in BldA+Resp.alv. It belongs to the PULM class in the LOINC classification.
What is LOINC?
LOINC (Logical Observation Identifiers Names and Codes) is a universal standard for identifying laboratory and clinical observations. It is maintained by the Regenstrief Institute and used worldwide for health data exchange.