what is pcr blood test
Polymerase Chain Reaction (PCR). PCR is a laboratory method used for making a very large number of copies of short sections of DNA from a very small sample of genetic material. This process is called amplifying the DNA and it enables specific genes of interest to be detected or measured.his method is used to measure the amount of DNA that is present in a sample. RT â PCR (Reverse Transcriptase PCR). This method uses PCR to amplify RNA. RNA is a single stranded nucleic acid molecule and needs to be made into DNA before it can be amplified.