“Carbon monoxide (CO) is a colorless, odorless, tasteless and potentially deadly gas. Each year, over 20,000 people in the United States are poisoned by carbon monoxide and nearly 450 people are killed.1,2,3 Carbon monoxide poisoning can be easy to diagnose when there is a history of exposure, but difficult when CO exposure is not suspected. We present a case of accidental carbon monoxide poisoning that was nearly missed due to a lack of screening in the field.”