Frequently asked questions

Our Scientific Applications Support team has assembled a list of frequently asked questions to help you find answers quickly. Filter using one or more categories to focus on specific topics, or use the search bar to perform a text search.

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Why can’t I select a quantity when I order custom oligos?

IDT Custom DNA Oligos are available at several synthesis scales and are usually supplied dried down. Therefore, we do not offer the option for a quantity of tubes. Even with our lowest synthesis scale, the yield delivered is sufficient for thousands of reac­tions with most standard applications. Due to this excess of product, most researchers resuspend oligos as a concentrated stock solution and, from that, create several tubes of working solution. IDT also offers several options for normalization and preparative services. Please contact Customer Care at for additional informa­tion on custom formulation.

Custom DNA & RNA