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The page below is a sample from the LabCE course Arthropods and the Clinical Laboratory. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about Arthropods and the Clinical Laboratory (online CE course)

Pseudoparasites are usually incidental or coincidental specimens. Some patients submit organisms recovered from the toilet bowl following urination or defecation. These specimens are not related to infection and probably did not come from the patient.
According to Mathison and Pritt (2014), some common examples are:
  • Earthworms
  • Horsehair (gordid) worms (long, thin, wiry-looking worms)
  • Drain fly larvae
  • Rat-tailed maggots
  • Psocids (booklice)
  • Carpet beetle larvae