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Test Code LAB318 Platelet Function Test

Synonym

  • PFST
  • PFA Screen

Specimen Required

Preferred Container/Tube: 2 full 3.2% Citrate Blue Top - 2.7 mL
Specimen Volume: 2.7 mL
Acceptable Container/Tube: 2 full 3.2% Citrate Blue Top - 1.8 mL
Specimen Volume: 1.8 mL

Specimen Collection Information

Specimens should be collected using a 21 g needle and hand-walked down to the lab. Do NOT spin, separate, or freeze the samples. Note: Outreach samples should be received in the laboratory within 2 hours of collection and testing complete within 4 hours. Notify lab at 293-8332 BEFORE transporting specimens.

Specimen Stability Information

Ambient: 4 hours

Rejected Due To

  • Ambient specimens >4 hours old
  • Samples improperly centrifuged
  • Samples sent in pneumatic tube system (PTS)

Reference Values

Collagen / Epi Closure Time: 73-172 sec
Collagen / ADP Closure Time: 53-111 sec

Cautions

Platelet counts less than 119K or more than 502K, and Hematocrit values less than 33% or greater than 52% can interfere with testing and valid results may not be obtained.

Method Description

 Instrument PFA-100 closure time: the time measured from the start of the test until a platelet to close aperture after exposure to agonist.

Performing Lab

Clinical Lab UH

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 day

Reporting Name

Platelet Function Screening Test

CPT Code Information

85576

LOINC Code Information

24471-5
24472-3