Читать книгу Practical Guide to Diagnostic Parasitology - Lynne Shore Garcia - Страница 75

In the past, it has been recommended that a normal examination for stool parasites before therapy include three specimens, consisting of two specimens collected from normal movements and one collected after the use of a cathartic such as magnesium sulfate or Fleet’s Phospho-Soda. The purpose of the laxative is to stimulate some “flushing” action within the gastrointestinal tract. A cathartic with an oil base should not be used, and a stool softener (taken either orally or as a suppository) is usually inadequate for obtaining a purged specimen. The use of a laxative prior to collection of the third specimen is much less common than in years past. Also, if the patient already has diarrhea or dysentery, the use of any laxatives would be contraindicated.

When a patient is suspected of having intestinal amebiasis, collection of six specimens may be recommended. The examination of six specimens ensures detection of approximately 90% of amebic infections. However, considering cost containment measures, the examination of six specimens is rarely requested.