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An initial VBG allows repeated VBG analysis (limiting patient discomfort) as opposed to requiring repeated ABG analysis to compare with an initial ABG. 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.
A VBG is obtained by placing a venous sample in the arterial blood gas analyser. VBGs are popular as it is far less painful for the patient to obtain a venous sample compared to an arterial sample. In addition, obtaining ABGs carries well known risks. VBGs are useful if you know how to interpret them and have a knowledge of their limitations.
Background & aim: Newer blood gas analyzers have the ability to report electrolyte values and glucose in addition to pH, so this diagnostic process could be condensed in diagnosing diabetic ketoacidosis (DKA). We aimed to assess the accuracy of the venous blood gas (VBG) analysis with electrolytes for diagnosing DKA. Methods: This study prospectively identified a convenience sample of (60 ...
ABG/VBG isn't needed to evaluate metabolic pH disorders. Complete analysis of pH status requires blood gas analysis, but all you need to determine the metabolic pH disorders is an electrolyte panel. Analysis of the metabolic pH disorders is usually the most important component (and frequently sufficient to guide treatment).
The VBG analysis plus SpO2 provided accurate information on acid–base, ventilation, and oxygenation status for patients in undifferentiated patients ED and ICU. VBGs are acceptable to use in working up common conditions like COPD and DKA.[5,6] New data could potentially broaden the list of indications for VBG instead of ABG
Based on this data, I developed formulae for conversion of VBG values into ABG values. This work was initially submitted to Critical Care Medicine, where it was rejected. No major flaws were found in the analysis, but it was deemed to be irrelevant (one reviewer wrote “This meta-analysis describes well a way to calculate ABG from VBG. However ...
The Arterial Blood Gas (ABG) Analyzer interprets ABG findings and values.