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Test Code PARID Parasite Identification

Performing Laboratory

Mayo Medical Laboratories in Rochester

Reporting Name

Parasite Identification

Specimen Type


Necessary Information

1. Specimen source and isolate description are required: morphology, tests performed, location of specimen, or other pertinent information.

2. Indicate reason for request.

Specimen Required

Specimen Type: Parasitic worms, insects, or mites

Container/Tube: Sterile container (10% formalin or 70% alcohol may be added if appropriate specimen type)

Specimen Volume: Entire specimen

Collection Instructions:

1. For scabies, submit skin scrapings on glass microscope slide. Cover with a clean slide and fasten down to transport. Rubber bands work well. Transport slides in a clean, dry container.

2. Submit whole worms and worm segments in 70% alcohol or formalin.

3. Submit arthropods (ticks, lice, nits, bed bugs, etc) in a clean, dry container.

Reject Due To









Specimen Stability Information

Specimen Type Temperature Time
Varies Ambient (preferred)

Specimen Minimum Volume


Day(s) and Time(s) Performed

Monday through Friday

Specimen Retention Time

1 week

Analytic Time

1 day

Reference Values

A descriptive report is provided.

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
BUG Arthropod Identification No, (Bill Only) No
WORMY Parasite Identification No, (Bill Only) No

Useful For

Gross identification of parasites (eg, worms) and arthropods (eg, ticks, bed bugs, lice, mites)


Detecting or eliminating the suspicion of parasitic infection by identifying suspect material passed in stool or found on the body


Diagnosing delusional parasitosis


Identifying ticks, including Ixodes (carrier of Lyme disease)

Testing Algorithm

When this test is ordered, 1 of the 2 reflex tests above will be performed and charged based on whether the object is an arthropod or worm. For parasite artifacts and nonhuman parasites, the reflex test performed will be based on whether the object most closely resembles a worm (eg, mucus strands, food material, fibers) or an arthropod (eg, free-living insects).


See Parasitic Investigation of Stool Specimens Algorithm in Special Instructions.

Method Name

BUG: Arthropod and Artifact Identification

WORMY: Gross and Microscopic Examination

CPT Code Information

87168-Arthropod (if appropriate)

87169-Parasite (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
PARID Parasite Identification 20932-0


Result ID Test Result Name Result LOINC Value
PARID Parasite Identification 20932-0

Clinical Information

Infectious diseases are spread and caused by a variety of macroscopic vectors. A wide array of macroscopic parasites (worms and ectoparasites) and parasite mimics or artifacts may be submitted for examination and identification. It is important to promptly and accurately identify these specimens so that the ordering physician can appropriately treat and counsel the patient.


A descriptive report is provided identifying the worm or arthropod. Worms and hard ticks are identified to the species level when possible, while other parasitic arthropods are identified to the genus level. Arthropods that do not cause human disease and parasite mimics resembling worms are reported as nonhuman parasites.


This test identifies a tick's species, age, sex, and level of engorgement. It does not include analysis of ticks for the presence of Borrelia burgdorferi, the agent of Lyme disease. Testing ticks for potential pathogens such as B burgdorferi, is not recommended since it does not indicate that the organism had been passed to the host during feeding.

Clinical Reference

Mathison BA, Pritt BS: Laboratory Identification of Arthropod Ectoparasites. Clin Microbiol Rev 2014;27(1):48-67

Method Description

The submitted organism or material is examined macroscopically and microscopically, as appropriate for the specimen. Organisms are identified to the species level when possible.(Garcia LS: Diagnostic Medical Parasitology. Fifth Edition. Washington, DC, ASM Press, 2007)


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