Background: We have previously developed a test for the diagnosis and prognostic assessment of the severe acute respiratory syndrome (SARS) based on the detection of the SARS-coronavirus RNA in serum by real-time quantitative reverse transcriptase polymerase chain reaction (RT-PCR). In this study, we evaluated the feasibility of automating the serum RNA extraction procedure in order to increase the throughput of the assay.
Methods: An automated nucleic acid extraction platform using the MagNA Pure LC instrument (Roche Diagnostics) was evaluated.
Background: Fetal RNA of placental origin has been detected in the plasma of pregnant women, but the timing of the first appearance and the detailed kinetics of postdelivery clearance of such circulating RNA have not been studied.
Methods: To address the timing of the first appearance of circulating placental RNA, we collected serial maternal blood samples from 47 women who had conceived by assisted reproductive procedures. To address the postdelivery clearance kinetics, we collected serial postdelivery blood samples from 6 pregnant women who had delivered by cesarean section.