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Test Code PFT-EPI Platelet Function Test

Important Note

For internal ordering only. Not available to outreach clients.

Synonyms/Keywords

PFA-100, Platelet Function Assay-100

Specimen Requirements

Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No Whole Blood Citrated Blue Top Tube (BTT)   2.7mL 2.7mL 1.8 mL

Collection/Processing Instructions

DO NOT CENTRIFUGE the vacutainer tube.

Specimen Stability Information

Specimen Type Temperature Time
Whole Blood Ambient 4 Hours

Rejection Criteria

Specimens filled below the fill line
Specimens showing platelet aggregates or microthrombi

Test Information

This orders a Platelet Function Test – EPI. If the epinephrine test is prolonged, a reflexive ADP test is ordered and billed.

Interpretations

The interpretation of a prolonged epinephrine test requires the ADP result. Prolonged epinephrine with a normal ADP suggests aspirin or aspirin-like effect. Prolonged epinephrine and ADP are suggestive of intrinsic platelet defect, von Willebrand’s disease or effect of platelet inhibiting agents.

Reference Range Information

Performing Location Reference Range
Marshfield

Platelet Function Test - Epi:
<1 month: 47-115 seconds
= or >2 years: 65-176 seconds


Platelet Function Test - ADP:
<1 month: 44-68 seconds
= or >2 years: 52-112 seconds


For ages not listed (>1 mo but less than 2 years), use the = or > 2 years ranges:
No reference ranges have been established for this group.
See Critical value List for list of current critical values

Marshfield Labs Performing Department

Marshfield Labs Hematology

Performing Information

Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Weston Monday through Sunday Less than 2 hours High Shear Closure Time with EPI/ADP / PFA-100
Marshfield Monday through Sunday Less than 2 hours High Shear Closure Time with EPI/ADP/ PFA-100

CPT Codes

CPT Modifier
(if needed)		 Quantity Description Comments
85576   1 PFT-EPI  
85576   1 PFT-ADP If reflexed

Ordering Applications

Ordering Application Description
Cerner Platelet Function-EPI