How is a stool or urinary analysis performed in the evaluation of schistosomiasis (bilharzia)?

Updated: Sep 20, 2018
  • Author: Shadab Hussain Ahmed, MD, AAHIVS, FACP, FIDSA; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

Identify and speciate the eggs in the stool or urine. Quantification of the egg excretion is calculated by collecting 24-hour urine or stool, homogenizing the sample, and counting the eggs in a measured sample. Urine or stool egg count in a 24-hour collection quantitates the severity of the infection. (However, urinary excretion of eggs is not uniform. The urine is most likely to be positive for S hematobium from 10 am until 2 pm. [43] )

Fewer than 100 eggs per gram of stool or 10mL of urine indicates a light infection; 100-400 eggs per gram of stool or 10mL of urine indicates a moderate infection, and more than 400 eggs per gram of stool or 10mL of urine indicates a heavy infection.


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