Peroral contrast

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Author: Mikael Häggström [notes 1]

In projectional radiography and fluoroscopy

Choice of contrast

  • Barium sulfate is generally used.
  • An iodine-based contrast medium is used where there is a risk of aspiration or perforation, where barium may cause chemical inflammation.[1][2]
However, 1-2% of oral iodine is absorbed in the gastrointestinal tract, and can potentially case a contrast medium reaction.[3] Also, it is more expensive than barium.


Patient age Iodine
Under 5 years 11g
5-10 years 22g
Adults 33g

The concentration in adults is typically around 350 mg of iodine per ml, but can be diluted to about 100mg/ml (especially for children that are under 10 kg or debilitated).[notes 2]


In CT scan


  1. For a full list of contributors, see article history. Creators of images are attributed at the image description pages, seen by clicking on the images. See Radlines:Authorship for details.
  2. 370mg/ml for undiluted gastrografin: Dosages:


  1. Hundemer GL, Kumar V, Vaduganathan M (2015). "Large-volume barium aspiration. ". Proc (Bayl Univ Med Cent) 28 (2): 183-4. PMID 25829647. PMC: 4365113. Archived from the original. . 
  2. Dr Vikas Shah ◉ and Dr Jeremy Jones. CT luminal contrast. Radiopaedia. Retrieved on 2018-11-07.
  3. . Oral Contrast Policies. Yale School of Medicine. Retrieved on 2018-11-07.