Comments on: DNA Amplification by Polymerase Chain Reaction (PCR) Discover the Science of Health Tue, 22 Mar 2016 00:58:16 +0000 hourly 1 By: Karin Hastings Mon, 17 Dec 2007 03:31:38 +0000 rt-PCR is a useful tool for testing purposes, but in a potentially mixed sample, there are a high percentage of false positives.