ABG/VBG Interpretation: A Practical Guide for Every Clinician

--ABG/VBG interpretation does not have to feel complicated. In this focused clinical review, we use a practical 6-step bedside algorithm to interpret arterial and venous blood gases: validate the sample, read the pH, identify the primary disorder, check compensation, calculate the anion gap and delta ratio, then assess oxygenation using the A–a gradient, oxygen response, and P/F ratio. This lecture is designed for clinicians who want a practical, repeatable approach to blood gas interpretation without getting lost in excessive formulas. We focus on how to apply the algorithm at the bedside, how to recognize mixed disorders, when venous blood gas is enough, when arterial blood gas is necessary, and how to avoid common traps such as normal pH with dangerous mixed disease. For medical education only; use patient-specific judgment, local protocols, and supervising clinical guidance. ----------------------------------------------------- #medical #medicine #تعليم_طبي #nursepractitioner #usmle #residency #nurse #viral #trending #ABG #VBG #BloodGas #acidbase #ABGInterpretation #VBGInterpretation #internalmedicine #criticalcare #emergencymedicine #medicaleducation #ClinicianEducation #AnionGap #oxygenation #ARDS #meded References: -Theodore AC. Arterial blood gases. UpToDate; accessed 2026. -Emmett M, Palmer BF. Simple and mixed acid-base disorders. UpToDate; accessed 2026. -Theodore AC. Venous blood gases and alternatives to arterial carbon dioxide measurement in adults. UpToDate; accessed 2026. -Morikawa MJ, Ganesh PR. Acid-Base Interpretation: A Practical Approach. Am Fam Physician. 2025;111(2):148–155. -Berend K, de Vries APJ, Gans ROB. Physiological Approach to Assessment of Acid–Base Disturbances. N Engl J Med. 2014;371:1434–1445. -Chong WH, Saha BK, Medarov BI. Comparing Central Venous Blood Gas to Arterial Blood Gas and Determining Its Utility in Critically Ill Patients. Anesth Analg. 2021;133(2):374–378. -Kelly AM. Review article: Can venous blood gas analysis replace arterial in emergency medical care? Emerg Med Australas. 2010;22(6):493–498. -Figge J, Jabor A, Kazda A, Fencl V. Anion gap and hypoalbuminemia. Crit Care Med. 1998;26(11):1807–1810. -Adrogué HJ, Madias NE. Secondary Responses to Altered Acid-Base Status: The Rules of Engagement. J Am Soc Nephrol. 2010;21:920–923. -Marino PL. The ICU Book. 5th ed. Ch. 31: Acid-Base Analysis. Wolters Kluwer; 2023.