Specific diagnosis of ascaris is made by -

Adult worm can be detected in stool occasionally by naked eye Barium meal may reveal the presence of adult worm in the small intestine plain abdominal film may reveal masses of worms in gas filled loops of bowel in patients with intestinal obstruction Pancreaticobiliary worms can be detected by ultrasound and endoscopic retrograde cholangiopancreatography. Ref : panikers textbook of Medical parasitology 8th edition page 205