🦠microbiology review

O&P

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025

Definition

O&P (Ova and Parasite) test is a diagnostic procedure used to detect parasitic infections in the gastrointestinal tract by examining stool samples for the presence of eggs (ova) and parasites. It is commonly used to diagnose infections caused by protozoa and helminths.

5 Must Know Facts For Your Next Test

  1. The O&P test requires multiple stool samples collected over several days to increase detection accuracy.
  2. Common protozoan parasites detected by the O&P test include Giardia, Entamoeba histolytica, and Cryptosporidium.
  3. Stool preservatives like formalin are often used to preserve the integrity of samples during transportation.
  4. Microscopic examination is essential for identifying specific ova and parasites in stool samples.
  5. Proper sample collection and handling are crucial to avoid contamination that could lead to false results.

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