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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Peroxidase Stain

Test Code(s): PERX / HCPERX

CPT Code(s): 88313

Methodology: Manual

Clinical Significance: For histochemical demonstration of leukocyte peroxidase.

Days Performed: Mon-Fri, dayshift.

Turnaround Time: Stat: Not available stat.

Specimen Requirements

Specimen: Blood

Collection Container: Preferred: Lavender top

Collection Volume: Preferred: 4 mL
Pediatrics: 0.5 mL

Sample Analyzed: Stained peripheral blood coverslip

Volume Required: Preferred: 1 mL
Pediatrics: 0.5 mL

Specimen Processing: Keep specimen at room temperature.

Specimen Transport: Transport specimen at room temperature to UWHC Core Laboratory (B4/220) within 2 hours of collection.

Unacceptable Criteria: Hemolyzed or clotted specimens are not acceptable.

Stability: Ambient: 2 hours
Refrigerated: Not acceptable
Frozen: Not acceptable


A hematopathologist's written interpretive report is issued as a separate report.

Additional Information:

A professional fee may be associated with this test.

Myeloperoxidase Stain, Blood PMN MPO

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