How to Order Custom DNA Oligos from IDT (EU Site)

Updated

You can order custom DNA oligos directly on eu.idtdna.com through the Custom DNA Oligos online ordering flow. The site states that more than 90% of standard desalted orders ship within 24 hours and that oligos are quality checked by ESI-MS. Before you start, decide on your sequence, scale, purification, and any modifications, and have an account or the Quick Order option ready.

What the EU site lets you order

The EU storefront covers the main oligo categories you would need for molecular biology work:

Category Examples listed on the site
Custom DNA oligos DNA Oligos, Ultramer DNA Oligos, Oligo pools, SameDay Oligos, HotPlates, Rapid HPLC Oligos, TruGrade DNA Oligos, Mixed bases, Affinity Plus DNA Oligonucleotides, Normalized Oligos
Custom RNA oligos RNA Oligos, Ultramer RNA Oligos, Affinity Plus RNA Oligonucleotides
Modifications Attachment chemistry and linkers, fluorophores and dark quenchers, modified bases, phosphorylation, spacers, click chemistry modifications, phosphorothioate bonds
GMP oligos Custom GMP Oligos
Reagents Nuclease-free reagents, nuclease detection and control
Cards OligoCard

If your project involves qPCR or dPCR rather than plain oligos, the same site also lists PrimeTime qPCR probes, LNA qPCR probes, molecular beacons, MGB Eclipse probes, and predesigned assays.

Before you order: what to prepare

  1. Sequence — your target DNA sequence in the correct orientation.
  2. Scale and yield — how much oligo you need for your downstream application.
  3. Purification — the site distinguishes standard desalted orders (the ones with the 24-hour shipping claim) from other options such as HPLC-based purification.
  4. Modifications — if you need a fluorophore, quencher, phosphorylation, spacer, or phosphorothioate bond, select it from the modification menu rather than ordering a plain oligo.
  5. Account or quick order access — the site shows Sign in, My Account, Order History, Wishlist, and Quick Order in its navigation, so you can either log in to a full account or use the quick order path.

How to place the order

  1. Go to eu.idtdna.com and open the Custom DNA Oligos ordering entry under Products & Services → Oligos & Reagents.
  2. Enter your sequence and select scale, purification, and any modifications.
  3. Review the configuration and price shown in your cart (the site displays $ USD in its header).
  4. Sign in to your account or use Quick Order to submit.
  5. After ordering, you can track status through My Account and Order History.

Expected result: a confirmed order for your specified oligo, with standard desalted orders typically shipping within 24 hours according to the site.

Common sticking points

  • Modification vs. standard oligo: if you need a dye, quencher, or modified base, choose the modification option — a standard desalted oligo will not carry it.
  • Purification choice: the 24-hour shipping statement applies to standard desalted orders, not necessarily to every purification type.
  • Quality check: ESI-MS verification is stated for oligos, so factor that into your QC planning.
  • Payment and account questions: the site links to a Payment Information support page if you need details on how payment is handled.
  • Order questions: the site offers an Ask a Scientist contact path for questions about an oligo order or a custom project.

If you are unsure whether a specific modification or scale is available for your sequence, use the Ask a Scientist option before submitting rather than guessing at the configuration.