Cryptosporidium Antigen in Stool (Qualitative)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you’ve experienced persistent diarrhea, abdominal pain, or other digestive issues—especially if you suspect a parasitic infection. It’s also used in monitoring people with weakened immune systems (e.g., due to HIV/AIDS, chemotherapy, or organ transplants) who may be at higher risk of infection.

What to Expect Before the Test

No special preparation is needed, but you may be asked to collect a fresh stool sample in a provided container. If you’re on antibiotics or have recently had a bowel movement, let your provider know, as these factors could affect results.

What the Results Mean

A positive result means Cryptosporidium parasites were detected in your stool, suggesting an active infection. A negative result means no parasites were found, but other causes of symptoms (like food poisoning, IBS, or viral infections) could still be present.

When to Follow Up

If you test positive, your provider will likely recommend further testing (e.g., bloodwork or stool cultures) and may prescribe treatments like oral rehydration solutions or antiparasitic medications. Follow their guidance closely to manage symptoms and prevent spread.