No workup
Stool culture
Systemic toxicity
Extended workup including blood cultures
Extended workup including blood cultures
Typically not done in the ER (at follow-up)
Stool culture (including Salmonella, Shigella, and Campylobacter)
Stool O&P (including testing for protozoal parasites, Giardia, Cryptosporidium)
Fecal leukocytes, giardia antigen, C. difficile PCR
Stool culture (including Salmonella, Shigella, and Campylobacter)
Stool O&P (including testing for protozoal parasites, Giardia, Cryptosporidium)
Fecal leukocytes, giardia antigen, C. difficile PCR
Traveler's diarrhea
Viral 
Cholera
Bacterial
HIV diarrhea
Campylobacter
Acute gastroenteritis
Shigella