ABG Master Interpretor

ABG Master Interpreter is the comprehensive, offline-first arterial blood gas interpretation platform engineered specifically for intensivists, ER, acute care physicians, anesthesiologists, nephrologists, residents, and medical students.

Unlike basic calculators that rely solely on classic bicarbonate equations, ABG Master Interpreter unites the three major paradigms of acid–base physiology into a single, cohesive clinical assessment:
1. The Boston School (Physiological Model)
2. The Copenhagen School (Standard Base Excess Model)
3. The Stewart School (Modern Physicochemical Model)

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THE TRI-APPROACH ACID–BASE ENGINE
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1. BOSTON PHYSIOLOGICAL APPROACH
• Precise systemic pH assessment and hydrogen ion activity ([H⁺] nmol/L).
• Candidate primary acid–base disorder identification.
• Winter’s formula compensation interval for metabolic acidosis.
• Metabolic alkalosis respiratory hypoventilation compensation limits.
• Acute and chronic respiratory adaptation rules (pH–PaCO₂ relationships).
• Classic Anion Gap with Figge albumin correction.
• Delta Ratio (ΔAG / ΔHCO₃⁻) and Delta-Delta analysis to unmask occult mixed disorders.

2. COPENHAGEN (SBE / SIGGAARD-ANDERSEN) APPROACH
• Standard Base Excess (SBE) calculation via validated Van Slyke equations.
• Quantitative Fencl–Stewart SBE partitioning:
- Sodium–chloride difference effect (hyperchloremic acidosis vs hypochloremic alkalosis)
- Albumin charge contribution (hypoalbuminemic alkalosis quantification)
- Inorganic phosphate buffer contribution
- Residual unmeasured ion impact

3. STEWART MODERN PHYSICOCHEMICAL APPROACH
• Apparent Strong Ion Difference (SIDa = [Na⁺] + [K⁺] + [Ca²⁺] + [Mg²⁺] - [Cl⁻] - [Lactate⁻]).
• Effective Strong Ion Difference (SIDe) incorporating albumin and phosphate buffers.
• Strong Ion Gap (SIG = SIDa - SIDe) for precise identification of unmeasured circulating anions.
• Total weak non-volatile acid calculation (Atot).

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BEDSIDE CLINICAL DECISION SUPPORT
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• Integrated Clinical Synthesis: Unifies Boston, Copenhagen, and Stewart findings into one clear clinical diagnosis.
• Differential Diagnoses & Clinical Checks: Evidence-based differential prompts (DKA, sepsis, renal failure, toxic ingestions, saline resuscitation).
• Oxygenation Assessment: PaO₂/FiO₂ (P/F) ratio evaluation categorized by Berlin ARDS criteria.
• Strict Unit Safety: Full support for both g/dL and g/L (albumin) and mg/dL and mmol/L (phosphate) without dangerous numeric guessing.
• Negative Base Excess Toggle: Dedicated (±) sign toggle for seamless mobile negative SBE entry.
• Safe Reset Values: Cleanly discard unsaved active values with confirmation protection.

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OFFLINE-FIRST PRIVACY & SERIAL TRACKING
• 100% On-Device Storage: Patient records and serial blood gases are stored strictly in local IndexedDB.
• Zero Cloud Transfer: No patient data is ever transmitted, tracked, or uploaded. Fully privacy compliant.
• Serial ABG Trends: Track longitudinal clinical trajectory with interactive trend graphs.
• Report & CSV Export: Print formatted bedside summaries or export serial data.

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MEDICAL DISCLAIMER
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ABG Master Interpreter is an educational and clinical decision-support tool intended for qualified healthcare professionals and medical students. It does not replace comprehensive bedside clinical evaluation, history, examination, or physician judgment.

Developed by Medicine Beyond Harrison.
Support: [email protected]
YouTube: https://www.youtube.com/@MedicineBeyondHarrisons