Abgs Vs Vbgs. Abgs can be more difficult to obtain are more painful and require arterial puncture that risks complications. Multiple studies have shown that ph correlates well between vbg and abg.
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This is intended to prevent adding more injuries to the patient. In conclusion the vbg is a useful less painful and more easily gathered test than abg to asses for acidosis and hypercarbia. Abgs are drawn for a variety of reasons.
A 2014 british systematic review pooling data from 100 studies showed that ph agrees reasonably at all values best agreement at normal values the vbg ph is 0 03 units less than the abg ph but abnormal co2 and lactate levels didn t really agree between abgs and vbgs.
A vbg on the other hand tests the venous blood and can accurately determine ph and co2 but is unable to provide reliable o2 data. As shown in table 1 vbgs had low sensitivity and or specificity for detecting most blood gas abnormalities. Venous blood gases vbg s blood sample taken from either peripheral or central veins can serve as an alternative to an abg when evaluating patients with metabolic and respiratory disturbances. A vbg on the other hand tests the venous blood and can accurately determine ph and co2 but is unable to provide reliable o2 data.
