Kato-Katz thick smear

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]} ; Associate Editor(s)-in-Chief: Aditya Ganti M.B.B.S. [2]


Kato-Katz thick smear is the classic and most commonly used method for identification of schistosome eggs in stool.


  • In Kato-Katz thick smear technique, a stool sample is obtained and a small amount is passed through a screen.
  • Approximately 50 mg of sieved stool is placed on a slide and covered with a glycerin-soaked cellophane cover slip.
  • Schistosome eggs, if present, are counted and multiplied by 20 to obtain the number of eggs per gram of stool.