Arterial-alveolar oxygen Partial pressure ratio 78354-8
LOINC Code
| LOINC code | 78354-8 | ||
|---|---|---|---|
| name | Arterial-alveolar oxygen Partial pressure ratio | ||
| description | 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] | ||
| status | ACTIVE | ||
Fully-Specified Name | |||
| component | Oxygen.arterial/Oxygen.alveolar | ||
| property | PPresRto = Partial Pressure Ratio | ||
| time | Pt = Point in time: To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements. | ||
| system | BldA+Resp.alv BldA = Blood arterial | ||
| scale | Qn = 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 | ||
| method | Calculated | ||
Additional Names | |||
| short name | a/A PO2 Rto | ||
Basic Attributes | |||
| class | PULM | ||
| type | 2 Clinical | ||
| order vs. observation | Both | ||
| 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 unit | ratio | ||
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 rank | 6140 of 2000 most commonly performed tests by labs in USA | ||
| first released | |||
| last updated | 2.73 | ||
| last change type | MIN - change to field other than name | ||
Related Names | |||
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Copyright © 2023 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 1995-2023, 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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