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SameDay™ DNA Oligos

Custom DNA oligos—manufactured and shipped the same day you order

SameDay Oligos are standard, desalted DNA oligos, delivered in tubes using our fastest shipping method. Place your order before the specified deadline to receive your oligos the following business day.

  • Receive your custom oligos the next business day after placing your order
  • Verified by ESI-MS prior to shipment—expedited without compromising quality
  • No minimum or maximum order requirements
  • Choose formulation for shipment—dry or hydrated in IDTE, pH 8


SameDay Oligos

Shipped dry or resuspended to 100 µM in IDTE buffer, pH 8.0. Delivered in tubes. To meet the ordering deadline, orders for SameDay Oligos must be placed online.


SameDay Oligos are standard desalted DNA oligos, delivered in tubes using our fastest shipping service available. If you place your order before the day’s deadline (see below), you will receive your oligos on the following business day.

Every DNA Oligo you receive will be deprotected and desalted to remove small molecule impurities. In addition, your oligos will be quality controlled via proprietary ESI-mass spectrometry methods, and quantitated twice by UV spectrophotometry for accurate yield measurements.


  • 2 OD minimum guarantee (sufficient for >250 PCR reactions)
  • 15–45 DNA bases; no modifications or modified bases
  • Each oligo quality controlled by electrospray ionization–mass spectrometry
  • Available in tubes only, dry or hydrated in IDTE buffer, pH 8.0
  • Deprotected and desalted
  • Additional shipping and handling fee for expedited delivery

Ordering deadlines


United States

Order online by 3:00 pm ET



Order online by 1:00 pm CET



Order online by 10:00 am SGT

IDT’s long-standing reputation as a leader and pioneer in custom oligo manufacturing is largely due to our vertically integrated proprietary synthesis platforms. Nearly every component of our manufacturing process is designed and developed in-house, including specialized synthesizers that can accommodate the most demanding oligo requests, and high-throughput automation systems that ensure the fastest turnaround times possible. We do not rely on third-party manufacturers for any of the machines or chemical reagents used for synthesis, allowing us to easily monitor and refine instruments and reagents with ease. Our ability to control these variables allows us to produce oligos that are unmatched in quality and consistency.

An important measure of quality for any oligo manufacturer is coupling efficiency, because this directly affects the amount of full-length product you receive. Our manufacturing processes achieve extremely high coupling efficiencies (Figure 1) and are standardized across our global manufacturing sites (Figure 2) to provide you with the most consistent quality in the industry. No matter where in the world you are conducting your research, an IDT oligo is an IDT oligo. Our commitment to quality and consistency results in an extremely reliable product that will perform the same each time it is used. Because your research requires a steady supply of oligos over time, this reliability provides confidence in your research.

Figure 1. Proportion of full-length product is a factor of coupling efficiency. DNA oligos from IDT are sysnthesized on proprietary platforms that deliver higher coupling efficiency than industry standards. The increasing importance of coupling efficiency to increased oligo length is shown.

Figure 2. Daily monitoring of coupling efficiency at all IDT manufacturing sites. Many variables can lead to reduced oligo quality, including ambient temperature, humidity, and input reagents). We track coupling efficiency at all of our manufacturing sites to ensure consistent quality with change in variables. A 30-day rolling average is shown.

User guides and protocols

Frequently asked questions

OligoAnalyzer™ tool

Identify oligonucleotide properties, including melting temperature, hairpins, dimers and mismatches

UNAFold tool

Perform secondary structure analysis

Dilution Calculator

Find the volume needed to dilute your oligo stock to a lower concentration

Resuspension Calculator

Find the volume needed to resuspend a dry oligo to a desired concentration