For seven days before and during the stool collection period avoid non-steroidal anti-inflammatory drugs such as ibuprofen, naproxen or aspirin (more than one adult aspirin a day).
Acetaminophen (Tylenol*) can be taken as needed.
For three days before and during the stool collection period avoid vitamin C in excess of 250 mg a day from supplements, and citrus fruits and juices.
For three days before and during stool collection period avoid red meats (beef, lamb and liver).
Eat a well balanced diet including fiber such as bran cereals, fruits and vegetables.