Jun 28, 2017




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Microbiology

Parasite, Extended Microscopic Exam, Fecal

Parasite, Extended Microscopic Exam, Fecal (XOP) Microbiology Lab Test

Name: Parasite, Extended Microscopic Exam, Fecal

Test Name: Parasite, Extended Microscopic Exam, Fecal

Health Link Test Code: XOP

LIS Test Code: PARE

CPT Code(s): 87177, 87209

Methodology: Microscopy

Days Performed: Mon-Fri, dayshift - day varies.

In-Lab Turnaround Time: 1 - 5 days.

Stat In-Lab Turnaround Time: Not available stat.

Specimen: Stool

Collection Instructions:

See instructions included in Para-Pak® Ova & Parasite (O & P) kit (pink and gray caps) for stool specimens. If patient has had barium or bismuth enemas, wait 2 weeks before collecting specimen. If the patient has received bismuth mineral oil, antibiotics, antimalarial agents or nonabsorbable antidiarrheal preparations, also wait 2 weeks before collecting specimen.


If sending fresh stool in a sterile container send minimum of 12 mL of stool.


If sending Para-Pak® Ova & Parasite (O & P) kit fill to red fill line indicated on vial (~5-6 mL of stool).

Stability Ambient:

Unpreserved: 1 hour

Para-Pak: Unlimited

Stability Refridgerated:

Not acceptable

Stability Frozen:

Not acceptable

Specimen Transport:

Transport specimen to the laboratory.

Unacceptable Criteria:

Specimens on patients hospitalized more than 3 days are not acceptable. See "Additional Information" below.


LIMIT: One specimen every 48 hours.



Interpretation Type: Expected Results

Critical Calls: yes

Additional Information:

Requests for parasite exam will be honored if the patient is characterized by one of the following.  Please include this information when ordering the test.

If the above criteria are NOT met, a Giardia/Cryptosporidium Antigen Test will be performed instead.


Specimens will be retained for 2 weeks from the collection date. If further testing is requested, please contact the Director of Microbiology by calling the UWHC Microbiology Lab at (608) 263-8710.


Examination for Cryptospordium, Cyclospora, Isospora, Microsporidia and pinworm must be ordered separately and clearly indicated on request form.


For most gastrointestinal parasites, a single stool sample has a sensitivity of over 90%. If symptoms persist, examination of additional stool specimens may be warranted.


Because these agents do not cause hospital acquired infections, specimens on patients who have been hospitalized greater than 3 days will require approval of the Director of Microbiology or Pathology Resident.