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Effects of storage conditions on two platelet agonists for whole blood impedance platelet aggregometry in dogs
Author(s) -
Shropshire Sarah B.,
Olver Christine S.
Publication year - 2018
Publication title -
veterinary clinical pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.537
H-Index - 51
eISSN - 1939-165X
pISSN - 0275-6382
DOI - 10.1111/vcp.12663
Subject(s) - platelet , whole blood , urinalysis , adenosine diphosphate , medicine , arachidonic acid , reagent , chemistry , urine , pharmacology , platelet aggregation , biochemistry , enzyme
Background Whole blood impedance platelet aggregometry (Multiplate‐) can be performed with different agonists to evaluate platelet function. Although the manufacturer recommends disposal of stored reagents after 1 month at −20°C or 24 hours at 4°C, reagent integrity after reconstitution under different storage conditions is unknown. If reagent integrity is stable for longer periods, assay costs could decrease dramatically. Objectives This study aimed to determine the stability of reconstituted arachidonic acid ( AA ) and adenosine diphosphate ( ADP ) platelet agonists stored at −20°C and −80°C for up to 6 months. Methods Aliquots of reconstituted AA and ADP were stored at −20°C and −80°C each month for a total of 6 months. Six healthy staff‐owned dogs were enrolled in the study. A physical examination, CBC , diagnostic panel, urinalysis, and baseline platelet aggregometry assessment was performed on all of the dogs. Platelet aggregometry was performed using fresh and stored aliquots of AA and ADP reagents on the same day. The area under the curve ( AUC ) was recorded from each platelet aggregometry analysis. Repeated measures ( RM ) analysis (one‐way ANOVA ) was performed and subsequent time points (1, 2, 3, 4, 5, and 6 months) were compared with fresh AUC results. Results All dogs were clinically healthy, and all diagnostic tests were normal. There were no differences in AUC obtained from fresh samples at any time point or either temperature for AA or ADP . Conclusions Whole blood impedance platelet aggregometry reagents, AA and ADP , were stable for up to 6 months when stored at −20°C or −80°C, obviating the need to discard viable reagents, and decreasing assay costs.