ABG Analysis - Patient KUMARI (Female) | 07/07/2026 23:02

Raw Values

Step 1: Acid-Base Status

• pCO2 is 35 mmHg (at the low end of normal), suggesting mild hyperventilation
• HCO3- 23.2 is appropriately low-normal as compensation
• BEecf of -1.1 confirms no significant metabolic disturbance

Step 2: Oxygenation

• pO2 of 190 mmHg is far above normal, indicating the patient is on supplemental oxygen (likely 40-60% FiO2 or more).
• SO2c 100%, Hct 55%, Hb ~17.1 g/dL - oxygen carrying capacity is actually elevated due to polycythaemia.
• A-a gradient cannot be calculated without knowing FiO2 precisely, but the high pO2 on oxygen is not alarming - it means oxygenation is adequate on supplemental O2.

Step 3: Critical Abnormalities - RED FLAGS

1. SEVERE HYPONATRAEMIA - Na+ 124 mmol/L ⚠️

• Normal: 135-145 mmol/L
• This is severe hyponatraemia (< 125 is critical)
• At 124, this can cause cerebral oedema, seizures, and coma
• Requires urgent assessment: is it symptomatic? (altered sensorium, seizures, vomiting?)
• Likely causes in context: SIADH, hyperglycaemia-induced dilutional hyponatraemia, adrenal insufficiency, or true sodium depletion

Corrected Na for hyperglycaemia: Add 1.6 mEq/L for every 100 mg/dL glucose above 100. Glucose is 277, excess = 177 mg/dL → correction = +2.8 mEq/L Corrected Na = 124 + 2.8 ≈ 126.8 mmol/L - still severely low.

2. SEVERE HYPOCALCAEMIA - iCa++ 0.66 mmol/L ⚠️

• Normal ionised calcium: 1.15 - 1.35 mmol/L
• This is critically low (less than half of normal)
• Risk of: tetany, laryngospasm, seizures, prolonged QT, cardiac arrhythmias
• Causes: hypoparathyroidism, pancreatitis, sepsis, post-thyroid surgery, vitamin D deficiency, hyperphosphataemia, rhabdomyolysis

3. HYPOKALAEMIA - K+ 3.1 mmol/L

• Mild but needs attention, especially in the context of severe hypocalcaemia (combined electrolyte abnormality worsens cardiac risk)
• Causes: vomiting, diarrhoea, diuretic use, poor intake

4. ELEVATED LACTATE - 3.9 mmol/L ⚠️

• Normal: < 2.0 mmol/L
• This is hyperlactataemia (Type A or Type B)
• At 3.9, this suggests tissue hypoperfusion or metabolic stress
• Combined with hyperglycaemia (277 mg/dL), this could indicate:
  • Diabetic emergency with poor peripheral perfusion
  • Sepsis
  • Metformin-associated lactic acidosis (if on metformin - though pH is not acidotic yet)
• Must be trended - if rising, suggests worsening perfusion

5. HYPERGLYCAEMIA - Glucose 277 mg/dL ⚠️

• Consistent with uncontrolled diabetes or a diabetic emergency (DKA/HHS)
• pH 7.43 and HCO3 23.2 do NOT suggest DKA (DKA would show pH < 7.3, HCO3 < 15)
• This is more consistent with Hyperosmolar Hyperglycaemic State (HHS) or poorly controlled T2DM
• Osmolarity should be calculated: 2×Na + Glucose/18 + BUN/2.8
  • = 2(124) + 277/18 = 248 + 15.4 = ~263 mOsm/kg (low due to hyponatraemia)

6. POLYCYTHAEMIA - Hct 55%, THbc 17.1 g/dL ⚠️

• Both are elevated above the female normal range
• Possible causes: dehydration/haemoconcentration (most likely given HHS context), polycythaemia vera, chronic hypoxia
• If the patient is dehydrated, this also explains the lactate elevation (poor perfusion)

Step 4: Synthesis - Clinical Picture

Step 5: Urgent Management Priorities

1. Hypocalcaemia (MOST URGENT): IV Calcium Gluconate 10% - 10-20 mL slow IV push over 10 min. Monitor ECG during infusion. Then start IV calcium infusion.
2. Hyponatraemia: Do NOT correct rapidly (risk of osmotic demyelination). Target correction < 10-12 mEq/L in 24 hours. Identify and treat the underlying cause. If symptomatic (seizures/coma), consider 3% NaCl carefully.
3. Hyperglycaemia: IV insulin infusion with close glucose monitoring. Must replace K+ before or alongside insulin (K will drop further with insulin).
4. Hypokalaemia: IV KCl replacement - monitor K+ hourly during insulin therapy.
5. Lactate/Dehydration: IV fluid resuscitation (0.9% NaCl or Ringer's Lactate). Trend lactate every 2 hours.
6. Rule out sepsis: Blood cultures, CBC, CRP, procalcitonin - lactate elevation in this context needs a source identified.
7. ECG immediately: Risk of prolonged QT and arrhythmia from severe hypocalcaemia + hypokalaemia.

Summary

This ABG is NOT about an acid-base emergency - the pH and gases are near-normal. The real crisis is the electrolyte panel: critically low ionised calcium (0.66), severe hyponatraemia (124), hypokalaemia (3.1), elevated lactate (3.9), and hyperglycaemia (277) in a polycythaemic (likely dehydrated) female patient. This constellation is life-threatening and requires immediate ICU-level electrolyte management and monitoring.