What is the most commonly indicated test for signs of foodborne illness (i.e., diarrhea)?

What is the most commonly indicated test for signs of foodborne illness (i.e., diarrhea)?

• A. Fecal occult blood
• B. CBC
• C. Urinalysis
• D. Stool culture

Answer: (A)

When a patient has diarrhea that suggests a foodborne illness, the goal is to identify the specific bacterial cause to guide treatment and public health actions. Stool culture is the best test for this because it directly grows and identifies the pathogens responsible—such as Salmonella, Shigella, Campylobacter, and pathogenic strains of E. coli—and can inform targeted antibiotic therapy and outbreak investigation. Fecal occult blood only detects hidden blood in the stool and doesn’t tell you what caused the illness. CBC and urinalysis are nonspecific and don’t identify enteric pathogens. Keep in mind that culture results take time and prior antibiotic use can affect yield, though cultures remain the standard test to pinpoint bacterial etiology in moderate to severe cases or when an outbreak is suspected.

When a patient has diarrhea that suggests a foodborne illness, the goal is to identify the specific bacterial cause to guide treatment and public health actions. Stool culture is the best test for this because it directly grows and identifies the pathogens responsible—such as Salmonella, Shigella, Campylobacter, and pathogenic strains of E. coli—and can inform targeted antibiotic therapy and outbreak investigation. Fecal occult blood only detects hidden blood in the stool and doesn’t tell you what caused the illness. CBC and urinalysis are nonspecific and don’t identify enteric pathogens. Keep in mind that culture results take time and prior antibiotic use can affect yield, though cultures remain the standard test to pinpoint bacterial etiology in moderate to severe cases or when an outbreak is suspected.