The Casoni test is a skin test used in the diagnosis of hydatid disease. The test involves the intradermal injection of 0.25 ml of sterilised fluid from hydatid cysts. A wheal response occurring at the injection site within 20 minutes is considered positive. (Immediate hypersensitivity). Delayed hypersensitivity reaction usually read after 18-24 hours.  The test is positive in about 90% of cases of hydatid disease affecting the liver, but positive in less than 50% of patients with hydatid disease elsewhere in the body; false positive results are also common. Consequently, serological tests are now generally used.
- Robert A. Evans. Special Tests: The Procedure and Meaning of the Commoner Tests in Hospital, page 14. Elsevier Health Sciences, 2003. ISBN 978-0-7234-3289-0.
- Richard Ravel. Clinical laboratory medicine, page 291. Elsevier Health Sciences, 1994. ISBN 978-0-8151-7148-5.
- Casoni T. La diagnosi biologica dell'echinococcosi umana mediante l'introdermoreazione. Folia Clinica Chimica e Microscopica; 1912: 4
|This medical diagnostic article is a stub. You can help Wikipedia by expanding it.|