Test Catalog

Test ID: OAPNS    
Ova and Parasite, Microscopy, Varies

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

Specimen Type Describes the specimen type validated for testing


Advisory Information

If specimens are suspected of containing tapeworm segments or other adult worms or worm segments, the suspected worm should be placed in 70% alcohol and submitted for PARID / Parasite Identification.


If microsporidia are suspected, request MTBS / Microsporidia Stain instead.


If pinworm is suspected, request PINW / Pinworm Exam, Perianal instead. Perianal skin sampling using clear cellophane tape or a SWUBE device is required for PINW.


Urine specimens should be sent for SHUR / Schistosoma Exam, Urine or TVRNA / Trichomonas vaginalis, Nucleic Acid Amplification, Female Patients, Varies as applicable.


If scabies is suspected, submit skin scrapings for PARID / Parasite Identification.


Duodenal aspirates, small bowel aspirates, or colonic washings should be placed in Ecofix in a ratio of 1:1 and OAP / Ova and Parasite, Microscopy, F should be requested.


Preserved stool analysis should be requested under OAP / Ova and Parasite, Microscopy, F.

Necessary Information

Specify on the order if a specific parasite is suspected.

Specimen Required Defines the optimal specimen required to perform the test and the preferred volume to complete testing

Specimen Type: Bile

Container/Tube: Sterile container

Specimen Volume: Entire collection


Specimen Type: Bone marrow

Container/Tube: Lavender top EDTA and/or slides

Specimen Volume: 4 mL

Collection Instructions:

1. Bone marrow and/or slides will be accepted for this test.

2. If submitting slides with EDTA tube, label and bag specimens together. Submit to lab refrigerate as 1 collection.


Specimen Type: Spinal fluid

Container/Tube: Sterile container

Specimen Volume: 1 mL


Specimen Type: Fluid, abscess, drainage material

Sources: Abdominal, ascites, brain, cyst, liver, lymphatic, peritoneal, splenic

Container/Tube: Sterile container

Specimen Volume: 15 mL

Collection Instructions:

1. Place half of collection into preservative (Ecofix or PVA and Formalin) in a ratio of 1:1.

2. Place other half of collection in a sterile container.

3. Label both specimens, bag together, and submit to lab refrigerate as 1 collection.


Specimen Type: Respiratory specimens including bronchial washing, bronchoalveolar lavage, sputum

Container/Tube: Sterile container

Specimen Volume: Entire collection


Specimen Type: Tissue

Sources: Bladder, brain, colon, intestine, liver, lymph node, lung, muscle, rectal, spleen

Container/Tube: Sterile container

Specimen Volume: 5-10 mm

Collection Instructions: Place specimen in 1 to 2 drops of sterile saline to keep tissue moist.


If not ordering electronically, complete, print, and send a Gastroenterology and Hepatology Client Test Request (T728) with the specimen. 

Specimen Minimum Volume Defines the amount of sample necessary to provide a clinically relevant result as determined by the Testing Laboratory

Respiratory specimens, spinal fluid, abscess, or drainage material: 0.5 mL
Tissue: 3 mm

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected

All specimens will be evaluated by Mayo Clinic Laboratories for test suitability.

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included

Specimen TypeTemperatureTimeSpecial Container
VariesRefrigerated5 days