![]() However where there is concern about a respiratory component to an illness, an initial ABG is necessary.A classic example of this is DKA, where the key variables are pH, lactate and potassium, all of which can be gathered from a VBG.(2) There is an obvious mis-match between the PaO2 (which is >100 mm) versus the pulse oximetry (which is typically 80-90 saturated). This immediately excludes true hypoxemia. In light of the above if there is no concern about the respiratory system it is reasonable to take a VBG as opposed to an ABG in the first instance when presented with an unwell patient. (1) PaO2 will be extremely high (typically >100 mm), because the patient is being treated with high levels of supplemental oxygen.An initial VBG allows repeated VBG analysis (limiting patient discomfort) as opposed to requiring repeated ABG analysis to compare with an initial ABG. Note that much of the utility of VBG and ABG analysis is to gather serial readings to determine response to treatment.The arterial PO2 is typically 36.9 mmHg greater than the venous with significant variability (95% confidence interval from 27.2 to 46.6 mmHg).Venous and arterial PO2 are also not comparable.The 95% prediction interval of the bias for venous PCO2 is unacceptably wide, extending from -10.7 mmHg to +2.4 mmHg. ![]() However, venous and arterial PCO2 are not comparable.oxygen-difference-between-po2-vs-spo2 Point of Care- Arterial Blood Gas, i-Stat. Peripheral venous HCO3 concentration is approximately 1 to 2 meq/L higher than arterial HCO3 PaO2, PaCO2, FiO2 indexes in arterial blood gas test results WebPaO2.Peripheral venous pH is only pH 0.02 to 0.04 lower than the arterial pH.VBG analysis compares well with ABG analysis for pH estimations in adults.From a 2014 meta-analysis and related papers:.The values on a VBG and ABG are comparable (arterial and venous values are NOT significantly different for practical purposes) except in the cases of O2 and CO2. ![]() ![]() Is a venous blood gas comparable to an arterial blood gas?
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