Maria Cordova, Mayo Labs, asks, How would calculate your DRVVT screen divisor?
Hello, Maria, and thank you. You've opened a provocative topic and inspired me to relive fun we had with our provocative September 25, 2015 post on this subject, "Don't Normalize the DRVVT ." This attracted perhaps the most attention of any 2015 topic. I'll invite you to follow the Liink to that topic, which includes a PDF of the 2013 article Dave McGlasson and I wrote for Seminars in Thrombosis and Hemostasis comparing six DRVVT kits and offering an opinion on the denominator used for DRVVT normalization. I hope the article and the blog entries answer your question.