Samples should be provided at the recommended concentration and quality in the appropriate container. RNA or DNA should be assessed on a gel or microfluidic device (eg Bioanalyzer) for quality. Amounts are preferably measured by a fluorescence assay (eg. Qubit) as Nanodrop measurements are prone to measuring contaminants and can be less accurate. For some library preparation methods (eg. Nextera XT) it is critical to provide an exact amount, for other methods within a range is ok.
Where the facility is performing the initial sample QC it will be necessary to provide 2 aliquots. Please check the Sample Input Requirements Table on the Library Preparation service page for specific sample input requirements.