arterial blood gas (ABG)
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Indications
- evaluation of acid-base status
- ventilation-perfusion abnormalities
Reference interval
* pH measurements may be obtained from venous blood, collected & analyzed as arterial blood. pH values are a mean of -0.04 pH units lower with venous blood (2 SDs -0.11 to + 0.04)[2].
In the elderly, pO2 (PaO2) is generally less than that in younger patients. (see PaO2)
Clinical significance
- arterial blood is used to measure
- oxygen (O2)
- carbon dioxide (CO2)
- pH
- these measurements are important for establishing
- acid-base status
- ventilation-perfusion abnormalities
- consider use of pulse oximetry plus transcutaneous CO2 if pH not needed
Procedure
- arteries of choice for obtaining specimen:
More general terms
Additional terms
Component of
Components
- partial pressure of oxygen in arterial blood (PaO2)
- partial pressure of carbon dioxide (paCO2) in arterial blood
- pH in blood
References
- ↑ Clinical Diagnosis & Management by Laboratory Methods, 19th edition, J.B. Henry (ed), W.B. Saunders Co., Philadelphia, PA. 1996
- ↑ 2.0 2.1 Journal Watch 21(24):196, 2001
Kelly AM, McAlpine R, Kyle E. Venous pH can safely replace arterial pH in the initial evaluation of patients in the emergency department. Emerg Med J. 2001 Sep;18(5):340-2. PMID: https://www.ncbi.nlm.nih.gov/pubmed/11559602 Free PMC Article - ↑ Treger R, Pirouz S, Kamangar N, Corry D. Agreement between central venous and arterial blood gas measurements in the intensive care unit. Clin J Am Soc Nephrol. 2010 Mar;5(3):390-4. PMID: https://www.ncbi.nlm.nih.gov/pubmed/20019117 Free PMC Article
- ↑ Wagner PD. The physiological basis of pulmonary gas exchange: implications for clinical interpretation of arterial blood gases. Eur Respir J. 2015 Jan;45(1):227-43. Review. PMID: https://www.ncbi.nlm.nih.gov/pubmed/25323225 Free Article