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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.

What is the fidelity of your Ultramer® Oligonucleotide synthesis?

Standard DNA oligos have a coupling efficiency of 99.2%. Ultramer oligos have a 99.5% coupling efficiency. This increase results in higher fidelity synthesis. With both syntheses, purification may be recommended for longer oligos based on your specific application. For further information regarding Ultramer oligos, please see our Ultramer Oligos Catalog Page at

Custom DNA & RNA

*RUO—For research use only. Not for use in diagnostic procedures. Unless otherwise agreed to in writing, IDT does not intend for these products to be used in clinical applications and does not warrant their fitness or suitability for any clinical diagnostic use. Purchaser is solely responsible for all decisions regarding the use of these products and any associated regulatory or legal obligations.