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Useful for sanity-checking calculated values when you suspect the patient just hypoventilated or hyperventilated.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Winters' formula (expected compensation in metabolic acidosis):","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"```","type":"text","version":1},{"type":"linebreak","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":"Expected PaCO₂ = (1.5 × HCO₃) + 8 ± 2","type":"text","version":1},{"type":"linebreak","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":"```","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"If the actual PaCO₂ falls outside this range, you're looking at a mixed disorder — not pure metabolic acidosis.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Worked Examples","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Healthy adult","type":"text","version":1},{"type":"linebreak","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":"HCO₃ 24, PaCO₂ 40 → 6.1 + log₁₀(24 / 1.2) = ","type":"text","version":1},{"detail":0,"format":1,"mode":"normal","style":"","text":"7.40","type":"text","version":1},{"type":"linebreak","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":"The classic 20:1 ratio. Everything balanced.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"COPD exacerbation (respiratory acidosis, partial renal compensation)","type":"text","version":1},{"type":"linebreak","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":"HCO₃ 28, PaCO₂ 60 → 6.1 + log₁₀(28 / 1.8) = ","type":"text","version":1},{"detail":0,"format":1,"mode":"normal","style":"","text":"7.29","type":"text","version":1},{"type":"linebreak","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":"The patient can't blow off CO₂. Kidneys have raised HCO₃ to compensate, but pH is still acidic — they need ventilatory support, not more bicarbonate.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Diabetic ketoacidosis (metabolic acidosis, respiratory compensation)","type":"text","version":1},{"type":"linebreak","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":"HCO₃ 10, PaCO₂ 25 → 6.1 + log₁₀(10 / 0.75) = ","type":"text","version":1},{"detail":0,"format":1,"mode":"normal","style":"","text":"7.22","type":"text","version":1},{"type":"linebreak","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":"Ketoacids consumed bicarbonate. The patient is breathing fast and deep (Kussmaul respirations) to drop PaCO₂. Winters' check: expected PaCO₂ = (1.5 × 10) + 8 = 23 ± 2. Actual is 25 — within range, so this is a pure metabolic acidosis with appropriate compensation.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Prolonged vomiting (metabolic alkalosis)","type":"text","version":1},{"type":"linebreak","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":"HCO₃ 36, PaCO₂ 48 → 6.1 + log₁₀(36 / 1.44) = ","type":"text","version":1},{"detail":0,"format":1,"mode":"normal","style":"","text":"7.50","type":"text","version":1},{"type":"linebreak","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":"Loss of stomach acid drove HCO₃ up. The respiratory system has nudged PaCO₂ up to compensate, but pH is still alkalotic. 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The mental shortcut for kPa users: multiply by 7.5.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Common Mistakes to Avoid","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Mixing venous and arterial values.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" A VBG reads ~0.03–0.05 lower in pH and ~4–6 mmHg higher in CO₂ than an ABG. 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If both PaCO₂ and HCO₃ sit far off baseline, something's going on even when pH looks fine.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":3},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Trusting calculated pH over measured.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Your analyzer's pH electrode is the gold standard. 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35:["$","div",null,{"className":"bg-white rounded-lg shadow-sm p-8","children":[["$","h2",null,{"className":"typo-large mb-6 text-mist-950","children":"Frequently Asked Questions"}],["$","div",null,{"className":"space-y-6","children":[["$","div","0",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What's a normal arterial blood pH?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"7.35 to 7.45. Below 7.35 is acidemia; above 7.45 is alkalemia. Most enzymes only function well inside that window, which is why the body defends it so aggressively.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","1",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Why does this calculator only need HCO₃ and PaCO₂?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Because pH itself depends only on the ratio of bicarbonate to dissolved CO₂. PaO₂, oxygen saturation, sodium, chloride, and lactate all matter for ","type":"text","version":1},{"detail":0,"format":2,"mode":"normal","style":"","text":"interpreting","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" the full ABG, but they're not in the equation that produces pH.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","2",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Where do 6.1 and 0.03 come from?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"6.1 is the pKa of carbonic acid in plasma at 37°C. 0.03 (mmol/L per mmHg) is the solubility coefficient that turns PaCO₂ into a dissolved-acid concentration. Both are physical constants — they don't change with the patient.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","3",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Can I use venous blood gas (VBG) values?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The math runs the same, but the output reflects venous chemistry. Add about 0.03–0.05 to a VBG-derived pH for an arterial estimate — but be cautious in shock or severe respiratory failure, where the arterial-venous gap widens unpredictably.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","4",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"My calculated pH is 7.20. What does that mean?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"That's significant acidemia. Whether it's respiratory (high PaCO₂) or metabolic (low HCO₃) depends on which value is abnormal in the direction that drives pH down. Either way, 7.20 needs prompt evaluation.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","5",{"className":"pb-6 last:pb-0","children":["$L37","$L38"]}],"$L39","$L3a","$L3b"]}]]}]
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2d:[["$","title","0",{"children":"ABG Calculator: Arterial Blood pH from HCO₃ & PaCO₂"}],["$","meta","1",{"name":"description","content":"Calculate arterial blood pH instantly from bicarbonate and PaCO₂. Henderson-Hasselbalch equation, supports Torr, mmHg, kPa, inHg, with bedside interpretation."}],["$","link","2",{"rel":"canonical","href":"https://activecalculator.com/calculators/health/abg-calculator"}],["$","meta","3",{"property":"og:title","content":"ABG Calculator: Arterial Blood pH from HCO₃ & PaCO₂"}],["$","meta","4",{"property":"og:description","content":"Calculate arterial blood pH instantly from bicarbonate and PaCO₂. Henderson-Hasselbalch equation, supports Torr, mmHg, kPa, inHg, with bedside interpretation."}],["$","meta","5",{"property":"og:url","content":"https://activecalculator.com/calculators/health/abg-calculator"}],["$","meta","6",{"property":"og:site_name","content":"ActiveCalculator"}],["$","meta","7",{"property":"og:locale","content":"en_US"}],["$","meta","8",{"property":"og:image","content":"https://activecalculator.com/api/og/calculator?title=ABG%20Calculator%3A%20Arterial%20Blood%20pH%20from%20HCO%E2%82%83%20and%20PaCO%E2%82%82"}],["$","meta","9",{"property":"og:image:width","content":"1200"}],["$","meta","10",{"property":"og:image:height","content":"630"}],["$","meta","11",{"property":"og:image:alt","content":"ABG Calculator: Arterial Blood pH from HCO₃ & PaCO₂"}],["$","meta","12",{"property":"og:type","content":"website"}],["$","meta","13",{"name":"twitter:card","content":"summary_large_image"}],["$","meta","14",{"name":"twitter:site","content":"@activecalculator"}],["$","meta","15",{"name":"twitter:creator","content":"@activecalculator"}],["$","meta","16",{"name":"twitter:title","content":"ABG Calculator: Arterial Blood pH from HCO₃ & PaCO₂"}],["$","meta","17",{"name":"twitter:description","content":"Calculate arterial blood pH instantly from bicarbonate and PaCO₂. Henderson-Hasselbalch equation, supports Torr, mmHg, kPa, inHg, with bedside interpretation."}],["$","meta","18",{"name":"twitter:image","content":"https://activecalculator.com/api/og/calculator?title=ABG%20Calculator%3A%20Arterial%20Blood%20pH%20from%20HCO%E2%82%83%20and%20PaCO%E2%82%82"}],["$","link","19",{"rel":"icon","href":"/favicon.ico?756f06c5b2066fec","type":"image/x-icon","sizes":"48x48"}],["$","$L3e","20",{}]]
37:["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Why is CO₂ measured as a pressure, not a concentration?"}]
38:["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Blood gas analyzers measure CO₂ as the partial pressure of dissolved gas, because that's what equilibrates directly with alveolar gas in the lungs. The 0.03 coefficient converts that pressure into a dissolved-acid concentration so it fits the equation.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]
39:["$","div","6",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"How accurate is this calculator?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The math is exact — same equation your analyzer uses internally. Accuracy depends entirely on the values you enter. If your analyzer reports a pH directly, that measurement should always take precedence.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3a:["$","div","7",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Does this work for pediatric or neonatal patients?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The Henderson-Hasselbalch equation applies across all age groups, but the ","type":"text","version":1},{"detail":0,"format":2,"mode":"normal","style":"","text":"normal ranges","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" drift slightly in neonates (slightly lower pH, lower HCO₃). The calculation itself is age-independent; the interpretation isn't.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3b:["$","div","8",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Can I use this clinically?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"For derivation, education, and double-checking, yes. For patient care decisions, always confirm against the analyzer-reported pH and bring a clinician familiar with the patient into the loop. This tool calculates a number — it doesn't replace clinical judgment.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
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