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Genetic thrombosis risk factors include a sequence variant in the prothrombin gene (20210G &gt; A) and factor V Leiden (1691G &gt; A). These single nucleotide polymorphisms can be diagnosed with restriction fragment length polymorphism (RFLP) analysis, fluorescent genotyping on the LightCycler (Roche Diagnostics, Indianapolis, IN), and microarray-based testing on the novel NanoChip electronic microarray (NanoChip Molecular Biology Workstation, Nanogen, San Diego, CA). We compared these methods for accuracy, time to results, throughput, and interpretation. Results from 789 of 800 individual amplicons analyzed on the NanoChip were in complete agreement with the other assays. Eleven were "no calls" (uninterpreted by the NanoChip system) resulting from failed polymerase chain reaction amplifications. Although the NanoChip System, when used in a low-throughput setting, requires more overall time than the LightCycler, it is nearly equivalent per genotyping call. Owing to minimal sample handling, assay results are more reliable on the NanoChip platform and on the LightCycler than with RFLP. The NanoChip assay is reliable and may be especially valuable to laboratories with a large volume of thrombophilia test requests.

american journal of clinical pathology

Diagnostic Single Nucleotide Polymorphism Analysis of Factor V Leiden and Prothrombin 20210G≫A: A Comparison of the Nanogen Electronic Microarray With Restriction Enzyme Digestion and the Roche LightCycler