Arab Board Clinical Pathology Part 1 Practice Questions - Arab Board Clinical Pathology Part 1 Written Examination (ABHS) Exam

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A 35-year-old man is brought to the emergency department unconscious. Arterial blood gas shows pH 7.12, pCO2 28 mmHg, HCO3- 9 mmol/L, Na+ 140 mmol/L, K+ 5.1 mmol/L, and Cl- 102 mmol/L. Measured serum osmolality is 325 mOsm/kg, blood glucose is 90 mg/dL (5.0 mmol/L), and blood urea nitrogen is 14 mg/dL (5.0 mmol/L). Urinalysis demonstrates envelope-shaped calcium oxalate crystals. What is the calculated osmolar gap and the most likely etiology?

Osmolar gap 32 mOsm/kg; Ethylene glycol ingestion Osmolar gap 12 mOsm/kg; Diabetic ketoacidosis Osmolar gap 5 mOsm/kg; Salicylate toxicity Osmolar gap 32 mOsm/kg; Methanol ingestion

Correct Answer:

Osmolar gap 32 mOsm/kg; Ethylene glycol ingestion

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