Arterial-alveolar oxygen Partial pressure ratio   78354-8

LOINC Code


LOINC code78354-8
nameArterial-alveolar oxygen Partial pressure ratio
descriptionThe 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]
statusACTIVE

Fully-Specified Name

componentOxygen.arterial/Oxygen.alveolar
propertyPPresRto  =  Partial Pressure Ratio
timePt  =  Point in time:  To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements.
systemBldA+Resp.alv
    BldA  =  Blood arterial
scaleQn  =  Quantitative:  The result of the test is a numeric value that relates to a continuous numeric scale. Reported either as an integer, a ratio, a real number, or a range. The test result value may optionally contain a relational operator from the set {<=, <, >, >=}. Valid values for a quantitative test are of the form "7", "-7", "7.4", "-7.4", "7.8912", "0.125", "<10", "<10.15", ">12000", 1-10, 1:256
methodCalculated

Additional Names

short namea/A PO2 Rto

Basic Attributes

classPULM
type2  Clinical
order vs. observationBoth
formula (readable)a/APO2=PaO2/PAO2, where PaO2 is arterial partial pressure of oxygen and PAO2 in alveolar partial pressure of oxygen
example UCUM units{ratio}
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business (www.unitsofmeasure.org)
example unitratio

Associated Observations

LOINC codes that represent optional associated observation(s) for a clinical observation or laboratory test. A LOINC term may represent a single associated observation or panel containing several associated observations.

History/Usage

test rank6140 of 2000 most commonly performed tests by labs in USA
first released
last updated2.73
last change typeMIN  - change to field other than name

Related Names

ABG
ALV
ART
Art bld
Art blood
Arterial
Arterial blood
Blood arterial
Calc
Calculation
Lung
O2
O2 A
Point in time
PULMONARY
Pulmonology
QNT
Quan
Quant
Quantitative
Random
Respiratory
tO2

Copyright © 2024 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 1995-2024, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. See https://loinc.org/license for the full LOINC copyright and license.

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