PCR (polymerase chain reaction): PCR (polymerase chain reaction) is a technique in molecular genetics that permits the analysis of any short sequence of DNA (or RNA) even in samples containing only minute quantities of DNA or RNA. PCR is used to reproduce (amplify) selected sections of DNA or RNA for analysis.
Polymerase chain reaction (PCR) analysis is a laboratory technique. The purpose of PCR testing is to find small amounts of DNA in a sample, using a process known as amplification.During PCR amplification, the DNA of interest is copied repeatedly until there is enough of it for analysis and detection.
The PCR assay in diagnosis involves several critical steps, such as DNA extraction from specimens, PCR amplification, and detection of amplicons. In particular, when specific clinical specimens, such as CSF, with only a few bacteria present are tested by PCR, each procedure must be carefully ...
Polymerase Chain Reaction (PCR) Test. As with the viral culture, your doctor swabs or scrapes a sample from one of your sores. A lab gets the sample and looks for genes from the herpes virus. PCR ...
PCR does not copy all of the DNA in the sample. It copies only a very specific sequence of genetic code, targeted by the PCR primers. For example, Chlamydia has a unique pattern of nucleotides specific to the bacteria. The PCR will copy only the specific DNA sequences that are present in Chlamydia and absent from other bacterial species.
As illustrated in the animated picture of PCR, three major steps are involved in a PCR.These three steps are repeated for 30 or 40 cycles. The cycles are done on an automated cycler, a device which rapidly heats and cools the test tubes containing the reaction mixture.
Polymerase chain reaction (PCR) is a method widely used in molecular biology to make many copies of a specific DNA segment. Using PCR, copies of DNA sequences are exponentially amplified to generate thousands to millions of more copies of that particular DNA segment.
The test is quick and easy. ... How long does it take to get results? It usually takes a few days to a week to get results, though a rapid test is available in some places.
Sometimes called "molecular photocopying," the polymerase chain reaction (PCR) is a fast and inexpensive technique used to "amplify" - copy - small segments of DNA. Because significant amounts of a sample of DNA are necessary for molecular and genetic analyses, studies of isolated pieces of DNA are nearly impossible without PCR amplification.
This GI profile is a multiplexed nucleic acid test intended for the simultaneous qualitative detection and identification of nucleic acids from multiple bacteria, viruses and parasites directly from stool samples in Cary-Blair transport media obtained from individuals with signs and/or symptoms of gastrointestinal infection.