Stewart's ABG

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About this app

Master the Complexity of Acid-Base Physiology at the Bedside.

Traditional methods of arterial blood gas (ABG) interpretation, such as the Boston or Copenhagen models, often fail to explain complex acid-base disturbances in critically ill patients.

Stewart's ABG provides a sophisticated clinical tool based on the Physical-Chemical Approach (Stewart Methodology), offering a deeper, more accurate understanding of your patient's metabolic status.

Built specifically for intensivists, critical care physicians, and anesthesiologists, this app simplifies the complex math behind the Stewart approach, allowing you to identify the underlying drivers of acid-base imbalance that traditional bicarbonate-centered models might miss.Key Clinical FeaturesThe Stewart Approach: Go beyond bicarbonate and Base Excess. Analyze the independent variables that truly govern pH: pCO2, Strong Ion Difference (SID), and Total Weak Non-volatile Acids (A{tot}).Strong Ion Difference (SID): Instantly calculate the apparent and effective SID to identify "hidden" metabolic acidosis or alkalosis caused by changes in unmeasured ions.Strong Ion Gap (SIG): Quantify unmeasured anions with precision. This is a critical marker for identifying occult tissue hypoperfusion or toxic ingestions in the ICU.Quantitative Analysis: Understand the impact of albumin, phosphate, and electrolytes on the patient's acid-base balance.Bedside Efficiency: Designed for high-acuity environments. Input your patient's lab values—including electrolytes, Albumin, and Phosphate—and get an immediate physiological breakdown. Why Choose the Stewart Method? In the ICU, patients often present with multi-factorial disturbances. The Stewart methodology is superior for:Hypoalbuminemia: Correctly interpreting acid-base status when low protein levels mask significant metabolic issues.Hyperchloremic Acidosis: Identifying the specific role of chloride in metabolic acidosis, common after large-volume resuscitation.Complex Cases: Distinguishing between metabolic disturbances in patients with renal failure, sepsis, or liver disease.Designed for Specialists.

Intuitive UI: A clean, focused interface that allows for rapid data entry during rounds or emergencies.
Precision-Engineered: Uses validated clinical formulas to ensure accuracy in every calculation.
Privacy First: All calculations are performed locally on your device. No patient data is ever uploaded or stored, ensuring total confidentiality in a clinical setting.
Educational Value
Whether you are a seasoned intensivist or a trainee in critical care medicine, ABG by Stewart serves as both a clinical calculator and an educational resource. By visualizing how electrolytes and proteins interact to dictate pH, you will gain a more intuitive grasp of physical-chemical physiology.

Disclaimer:This application is intended for use by trained healthcare professionals. It is a decision-support tool and should not replace clinical judgment or be the sole basis for patient management.

Download ABG by Stewart today and bring the next level of physiological analysis to your clinical practice.

What’s new

This first release version brings the power of the Stewart methodology to your pocket. Forget manual calculations; simply input your patient's values to get an immediate, detailed breakdown of their acid-base status for educational purposes.
Full calculation support for Stewart variables.
Designed for high-acuity environments.
Clean, intuitive UI for rapid data entry.