A 42-Year-Old Man Is Found Unconscious in a Subway Station

A 42-year-old man is found unconscious in a subway station.  He is brought to the emergency department where cardiopulmonary resuscitation is performed and intravenous glucose and thiamine are administered.  His laboratory profile shows: Which of the following is the best next step in the diagnosis of this patient's acid-base status?

A) Calculate the plasma anion gap
B) Calculate the plasma osmolal gap
C) Calculate the urine anion gap
D) Calculate the urine osmolar gap
E) Obtain venous blood gas

Correct Answer:

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