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In page Cell-free fetal DNA:

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In real-time PCR, fluorescent probes are used to monitor the accumulation of amplicons. The reporter fluorescent signal is proportional to the number of amplicons generated. The most appropriate real time PCR protocol is designed according to the particular mutation or genotype to be detected. Point mutations are analysed with qualitative real time PCR with the use of allele specific probes. insertions and deletions are analyzed by dosage measurements using quantitative real time PCR.[citation needed]