system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 56-year-old woman presents to the emergency department following a seizure episode. She has a remote history of tonic-clonic seizures; however, her seizures have been well-controlled on valproate, with no seizure episodes occurring over the past 12 years. She was weaned off of the valproate 4 months ago. Her temperature is 97.6°F (36.4°C), blood pressure is 122/80 mmHg, pulse is 85/min, respirations are 15/min, and oxygen saturation is 99% on room air. Examination reveals her to be lethargic and somewhat confused. She is moving all extremities spontaneously. Her mucous membranes appear moist and she does not demonstrate any skin tenting. Laboratory values are ordered as seen below.

Arterial blood gas
pH: 7.21
PO2: 99 mmHg
PCO2: 20 mmHg
HCO3-: 10 meq/L

The patient's initial serum chemistries and CBC are otherwise unremarkable except for the bicarbonate as indicated above. An ECG demonstrates normal sinus rhythm. Which of the following is the best next step in management for this patient's acid-base status?
assistant
Observation