Arterial blood gas analysers are designed to measure multiple components in the arterial blood. The readout from the machine quotes normal values based on the assumption that the sample analysed is arterial (an ABG). There is currently a plague of ‘venous’ blood gases (VBG) in clinical practice. A VBG is obtained by placing a venous sample in the arterial blood gas analyser. VBGs are ...
Conditions that may affect the reliability of VBG . Hypercapnia. When comparing VBG and ABGs, the average difference in CO2 reading was 5.7 mmHg.  However, the limits of agreement (-17.4 to +23.9) in this study are too wide to allow reliable quantification of PCO2.
Venous blood gas (VBG) interpretation . Arterial blood gases (ABGs) are commonly used for estimating the acid-base status, oxygenation and carbon dioxide concentration of unwell patients. However, arterial blood can be difficult to obtain due to weak pulses or patient movement. Due to thicker, muscular and innervated walls, arteries are also ...
VBG pCO2 is 4 lower than ABG pCO2. VBG pO2 is approximately 40 lower than ABG pO2. The bottom line is that for most of our clinical concerns, we can use VBG to assess pH and pCO2, and O2 sat to assess oxygenation. VBG may be less reliable in shocky or hypercapneic patients (but end-tidal CO2 will be useful in hypercapneic patients).
Reviewed and revised 7 January 2016 OVERVIEW Venous blood gases (VBG) are widely used in the emergency setting in preference to arterial blood gases (ABG) as a result of research published since 2001 The weight of data suggests that venous pH has sufficient agreement with arterial pH for it to be an acceptable alternative in clinical practice for most patients Nevertheless acceptance of this ...
A venous blood gas (VBG) is an alternative method of estimating systemic carbon dioxide and pH that does not require arterial blood sampling. Performing a VBG rather than an ABG is particularly convenient in the intensive care unit, since many patients have a central venous catheter from which venous blood can be quickly and easily obtained.
If the VBG oxygen saturation is low, the following techniques might be used to obtain a VBG with a higher oxygen saturation: Minimize the duration of tourniquet application (e.g., if the patient has a venous catheter that allows blood to be withdrawn, ... Read more » 2. Reply. Bjarne flou. 1 year ago ...
It may be an ABG or a VBG. Regardless, it is an opportunity to gain information quickly. This module will assist you in learning to read the ABG. Look for my overall approach to the ABG at the end of the exercise. This is a question from a previous Fellowship Examination. Without much stress, the diagnosis can be reached. What is the diagnosis?
pCO 2. The difference in the pCO2 measurements between the VBG and ABG is the most contested in the literature. There is a correlation between the arterial and venous pCO 2, but the confidence intervals are large with an average difference ranging from 5.7- 8.6mmHg.(Malinoski 2005, Kelly 2001, McCanny 2012, Malatesha 2007, Rang 2006, McKeever 2016).
Thanks to all authors for creating a page that has been read 367,904 times. Reader Success Stories. Gary Knight. Nov 11, 2019 "I teach ABG analysis quite a lot to medical staff. I have been asked to teach a session to junior nurses and started looking for an easy method to use. This article by Sarah is just the ticket, thanks."