View source for PFA-100

{{Short description|Platelet function analyser}}
The '''PFA-100''' ('''P'''latelet '''F'''unction '''A'''ssay<ref name="PFA">{{cite web |url=http://www.pathology.vcu.edu/media/pathology/clinical/coag/PFA-100FAQ.pdf |title=Platelet Function Assay FAQ |work=Department of Pathology |publisher=Virginia Commonwealth University |accessdate=2017-03-27 }}</ref> or '''P'''latelet '''F'''unction '''A'''nalyser<ref name="Google Books">[https://books.google.com/books?id=cBEqCAAAQBAJ&dq=PFA+test++abbreviation&pg=PA469 Burket's Oral Medicine, 12e. Edition. Edited by Michael Glick. PMPH-USA, 2015].</ref>) is a [[platelet]] function analyser that aspirates blood [[in vitro]] from a [[blood]] specimen into disposable test cartridges through a microscopic aperture cut into a biologically active [[Biological membrane|membrane]] at the end of a [[capillary]]. The membrane of the cartridges are coated with [[collagen]] and [[adenosine diphosphate]] (ADP) or collagen and epinephrine inducing a [[platelet plug]] to form which closes the aperture.
The PFA test result is dependent on platelet function, plasma von Willebrand Factor level, platelet
number, and (to some extent) the hematocrit (that is, the percent composition of red blood cells in the sample).
The PFA test is initially performed with the Collagen/Epinepherine membrane. A normal Col/Epi closure time
(<180 seconds) excludes the presence of a significant platelet function defect.
If the Col/Epi closure time is prolonged (>180 seconds), the Col/ADP test is automatically
performed. If the Col/ADP result is normal (<120 seconds), aspirin-induced platelet dysfunction is
most likely.
Prolongation of both test results (Col/Epi >180 seconds, Col/ADP >120 seconds) may indicate
the following;
* Anemia (hematocrit <0.28)
* Thrombocytopenia (platelet count < 100 x 10{{sup|9}}/L)
* A significant platelet function defect other than aspirin
Once anemia and thrombocytopenia have been excluded, further evaluation to exclude von
Willebrand disease and inherited/acquired platelet dysfunction can be made.<ref name="PFA"/>
==References==
{{Reflist}}
==External links==
* [http://www.practical-haemostasis.com/Platelets/platelet_function_testing_pfa100.html Practical Haemostasis]
{{DEFAULTSORT:Pfa-100}}
[[Category:Medical testing equipment]]
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