Test Catalog

Test ID: OAPNS    
Ova and Parasite, Microscopy, Varies

Useful For Suggests clinical disorders or settings where the test may be helpful

Detection and identification of parasitic protozoa and the eggs and larvae of parasitic helminths

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

Reflex testing will be added and performed by the laboratory based on the following criteria:

-Specimen source

-Specimen type: Unpreserved, refrigerate versus preserved

-Indication of parasites suspected

Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test

A variety of different parasites may be found in specimens other than stool (eg, respiratory specimens, liver cyst aspirates or abscesses, and tissues). These parasites may include protozoa (microscopic unicellular eukaryotes) and helminths (worms). Infection is often asymptomatic but possible signs and symptoms of infection include cough, fever, bloody sputum, skin lesions, and abdominal pain.

Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.


If positive, organism identified

Interpretation Provides information to assist in interpretation of the test results

A positive result indicates the presence of the parasite but does not necessarily indicate that it is the cause of the patient's symptoms. Some strains of protozoa are nonpathogenic and some helminths cause little or no illness.

Cautions Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances

This test is not appropriate for the detection of microfilariae, malaria, trypanosomes, or Trichomonas vaginalis.

Clinical Reference Recommendations for in-depth reading of a clinical nature

1. Garcia L: Diagnostic Medical Parasitology. 6th ed.ASM Press; 2016

2. Pritt BS: Parasitology Benchtop Reference Guide. 2nd ed. CAP; 2017