Multiplex testing for Factor II and Factor V mutations in thrombophilia: technical verification and clinical validation of the cobas® Factor II and Factor V test

• Published in: Journal of thrombosis and thrombolysis Vol. 47; no. 1; pp. 87 - 95
• Main Authors: Longshore, John W., DeMartin, Kelli, Yu, Karen, Das, Partha, Zhang, Guili, Rehage, Taraneh Tamaddon, Jethwaney, Deepa, Karwowska, Sylwia
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-01-2019; Springer Nature B.V
• Subjects: Automation; Cardiology; Coagulation factors; Contamination; Deoxyribonucleic acid; DNA; DNA sequencing; Ethanol; Factor V; Genotypes; Hematology; Hemoglobin; Laboratories; Medicine; Medicine & Public Health; Polymerase chain reaction; Thrombophilia; Thrombophilia; Factor II G20210A; Factor V Leiden; Factor II and Factor V test; cobas® Factor II and Factor V test
• ISSN: 0929-5305; 1573-742X
• DOI: 10.1007/s11239-018-1745-8

Laboratory testing for thrombophilia is complicated but essential for diagnosis. In 2017, the
cobas
® Factor II and Factor V Test (cobas F2F5 test) was launched for use with the
cobas z
480 analyzer. This qualitative polymerase chain reaction test enables multiplex Factor II and Factor V testing with flexible reporting and workflow efficiency. Here, we report the results from studies investigating the performance of the cobas F2F5 test. Technical performance verification, clinical validation, external laboratory performance, and workflow comparison studies were performed. Fresh and frozen whole-blood and genomic DNA (gDNA) samples were tested, and several manual and automated DNA isolation methods were used. Bidirectional Sanger sequencing was used to verify genotypes identified by the cobas F2F5 test. One hundred percent agreement between the cobas F2F5 test and Sanger sequencing was observed for all genotypes. An external laboratory using remnant clinical samples also yielded 100% agreement between cobas F2F5 test results and their routine testing method. The cobas F2F5 test reduced the total sample processing time compared with the LightCycler® 1.2 platform (98.6 vs 420.2 min; 96 samples). Hemoglobin, extraction buffer, and ethanol contamination of the gDNA sample can lead to invalid results. The cobas F2F5 test has a high degree of accuracy for identification of Factor II and Factor V genotypes. This multiplex testing with short sample processing time can reduce handling errors and increase efficiency. Both manual and automated DNA isolation methods can be used with the cobas F2F5 test.