Obtain blood for a rapid glucose determination, complete blood count, electrolyte levels, lactate level, and coagulation profile, if indicated. Collect urine for urinalysis, if indicated. Measure liver enzymes, especially aspartate aminotransferase and alanine aminotransferase. Consider a blood alcohol level and urine toxicology screen for use of drugs. Cardiac troponin I testing may be useful as a marker to predict children who have an elevated risk of not surviving to hospital discharge.
For more on the workup of drowning, read here.
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Cite this: Richard H. Sinert. Fast Five Quiz: What Do You Know About Drowning? - Medscape - Jun 27, 2016.