78354-8

Arterial-alveolar oxygen Partial pressure ratio

Active

Term 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

LOINC Names Get Info

Fully-Specified Name: Oxygen.arterial/Oxygen.alveolar:PPresRto:Pt:BldA+Resp.alv:Qn:Calculated
Long Common Name: Arterial-alveolar oxygen Partial pressure ratio
Short Name: a/A PO2 Rto

Part Model Get Info

Component
Oxygen.arterial/Oxygen.alveolar
LP286754-9
- Analyte
  Oxygen.arterial/Oxygen.alveolar
  LP286754-9
  - Component Numerator
    Oxygen.arterial
    LP199481-5
    - Component Numerator Core
      Oxygen.arterial
      LP199481-5
    - Component Numerator Core Suffix
      NULL
  - Component Denominator
    Oxygen.alveolar
    LP199473-2
    - Component Denominator Core
      Oxygen.alveolar
      LP199473-2
    - Component Denominator Core Suffix
      NULL
- Challenge
  NULL
- Adjustment
  NULL
- Count
  NULL
Property
PPresRto
LP199475-7
Time
Pt
LP6960-1
- Time Core
  Pt
  LP6960-1
- Time Modifier
  NULL
System
BldA+Resp.alv
LP199477-3
- System Core
  BldA+Resp.alv
  LP199477-3
- Super System
  NULL
Scale
Qn
LP7753-9
Method
Calculated
LP6165-7

Basic Attributes

Class: PULM
Type: Clinical
First Released: Version 2.54
Last Updated: Version 2.73 (MIN)
Order vs. Observation: Both
Common Test Rank Get Info: 6140

Formula (Readable)

a/APO2=PaO2/PAO2, where PaO2 is arterial partial pressure of oxygen and PAO2 in alveolar partial pressure of oxygen

Language Variants Get Info

Tag	Language	Translation
el-GR	Greek (Greece)	Οξυγόνο.αρτηριακό/Οξυγόνο.κυψελιδικό:PPresRto:Pt:Αρτηριακό+κυψελιδικό.οξυγόνο:Qn:Υπολογιζόμενο Synonyms: PPresRto Pt PULM Qn Αρτηριακό αίμα Αρτηριακό+κυψελιδικό.οξυγόνο Οξυγόνο Οξυγόνο.αρτηριακό Οξυγόνο.κυψελιδικό Υπολογιζόμενο
es-MX	Spanish (Mexico)	Oxígeno.arterial / Oxígeno.alveolar:PPresRto:Punto temporal:BldA + Resp.alv:Cuantitativo:Calculated
fr-CA	French (Canada)	Oxygène.Artériel/Oxygène.Alvéolaire:PPresRatio:Temps ponctuel:Sang artériel+Système respiratoire.alvéolaire:Quantitatif:Calculé
it-IT	Italian (Italy)	Ossigeno.arterioso/Ossigeno.alveolare:Rapporto di pressione parziale:Pt:Sangue arterioso+sistema respiratorio alveolo:Qn:Calcolato Synonyms: Gestione ventilazione polmonare Ossigeno arterioso Punto nel tempo (episodio) Sangue arterioso
zh-CN	Chinese (China)	氧.动脉/氧.肺泡:分压比率:时间点:动脉全血+呼吸系统.肺泡:定量型:计算法 Synonyms: O2;tO2;总氧;氧气分压（分压力、分压强、气体分压、部分压力、局部压应力）比率（比、比值、比例）动脉全血（动脉血）+呼吸系统.肺泡动脉血可用数量表示的;定量性;数值型;数量型;连续数值型标尺时刻;随机;随意;瞬间氧（氧气）.动脉氧（氧气）.肺泡肺部测量指标与呼吸机管理计算;计算型方法

Example Units

Unit	Source
{ratio}	Example UCUM Units

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LOINC Copyright

Copyright © Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 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.