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Workflows in NGS facilities require high-standard practices and high-throughput pipelines to process the large number of samples received in a timely manner. Downstream protocols such as NGS library preparation require accurate estimation of nucleic acid concentrations, which can be achieved using fluorescent dye-based nucleic acid measurement. Here, we report a protocol for preparing a 384-well Quant-iT PicoGreen assay. The protocol allows the concentrations of 184 DNA samples to be measured simultaneously in duplicate in only 1 h using an Eppendorf epMotion 5075 liquid handling system. The advantages of this high-throughput approach include a reduction in both reagents (10x less reagents compared to a standard protocol) and time (3 h for 384 samples compared with 3 days).