I went to the unipath website too and read the technical info on the CBE Digital HPT and it said that if no HCG is found then no 2nd line should show up at all. That's the way that I understood it. Here is the website. http://www.unipath.com/gims/content/image/ot
her/upuk2k3/docs/CBDPT-TechnicalBrochure.pdf
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