Feb 5, 2016




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

Blood Parasite Smear

Blood Parasite Smear (PARAST) Hematology Lab Test

Name: Blood Parasite Smear

Test Name: Blood Parasite Smear

Health Link Test Code: PARAST

LIS Test Code: PARAST (SLH Test Code) / UWPARAST (UW Test Code)

CPT Code(s): 87207x2

Test Component:

Thin prep smear for review by UWHC Laboratory; thick and thin prep smears for review by Wisconsin State Lab of Hygiene.


NOTE: To order this test you are required to provide pertinent travel history information including, the location of the travel, where the patient may have acquired the parasite and the date of such travel.

Clinical Information:

To diagnose parasitic infections, including speciation.  Screening for Malaria, Babesia and Ehrlichia will be performed by UWHC Laboratory.  Requests for microfilaria and trypanosoma will be sent to WSLH for testing.


Not recommended for patients that have no history of travel to endemic areas, blood transfusion or arthropod or insect bites/exposure.

Days Performed: Daily, 24 hours.

In-Lab Turnaround Time: Thin prep review: 1 hour. Thick/thin prep review: 1 - 3 days.

Specimen: Venipuncture or finger stick

Collection Container: See collection instructions.

Collection Instructions:

Preferred collection time is immediately before a fever spike is anticipated. Capillary blood collected into a lavendar- K3EDTA microtainer is preferred, lavendar-K2EDTA is acceptable. Otherwise whole blood in a lavendar K3EDTA tube is preferred, lavendar K2EDTA is acceptable.

Collection Volume: 1 mL

Pediatric Collection Volume: 0.25 mL in microtainer

Stability Ambient:

Whole blood: 1 hour

Stability Refridgerated:


Stability Frozen:

Not acceptable

Sample Analyzed: Whole Blood

Testing Volume: 1 mL

Pediatric Testing Volume: 0.25 mL in microtainer

Specimen Processing:

Slides must be prepared by laboratory within 1 hour of specimen collection. Prepare 5 thin slides (unstained, unfixed) and 2 thick slides (unstained, unfixed). Allow slides to dry completely prior to shipping.

Specimen Transport:

Transport whole blood specimen to UWHC Hospital Laboratory immediately. If sending slides, place in protective slide holder(s).


No blood parasites seen.

Interpretation Type: Expected Results

Critical Calls: yes

Additional Information:

Ordering source will be called if organisms are seen. One set of negative blood smears does not definitively rule out parasitic infection. Follow-up samples should be collected for a minimum of three successive days, every six to eight hours.