Twin Zygosity DNA Testing
This DNA test determines whether siblings are fraternal or identical twins or siblings. The cost of the DNA testing service includes two children but you may add more as needed; for instance a third sibling. Parental samples are optional; if provided, paternity and/or maternity can also be verified.
Step 1: Review shipping information
Please review the following important information:
All orders are shipped in plain, confidential packaging. There is nothing on our return address or packages to indicate the nature of the product inside!
For shipping in the continental U.S.
- All orders include a pre-paid addressed return mailer OVERNIGHT FedEx for NO EXTRA CHARGE
- You may choose how you want your kit sent to you. US Mail will take approximately 7-10 Days. For faster delivery of your kit, you may choose Priority Mail or overnight FedEx options (FedEx requires a street address and telephone number)
For shipping outside of the continental U.S: Orders to Canada, Mexico, Hawaii, Alaska, Puerto Rico and recognized US territories can be shipped by mail or FedEx but may not contain a prepaid FedEx return package, depending on location. For INTERNATIONAL orders please call or e-mail for shipping and handling charges.
When orders are shipped: Orders received* Monday through Thursday by 12 noon Mountain Time will be shipped that day; if you choose FedEx overnight you will receive the kit the following day. Orders placed on Fridays for FedEx shipment can be slotted for Saturday delivery (if service is available in your area), otherwise you will receive your shipment the following Monday. GTL does not ship or receive on weekends and most federal holidays.
* Although you may place your order before noon, GTL may not receive the order notification for several hours.
Step 2: Select a DNA test
Please Note: All orders include a pre-paid addressed return overnight FedEx mailer.
Click here for instructions to test parties in multiple locations.
Rush Analysis Options
- 24-Hour Release: $400
No more than 24 business hours from receipt of samples - Next Day Release: $175
By close of business on next business day following receipt of samples
- Second Day Release: $125
By close of business on 2nd business day following receipt of samples - Third Day Release: $75
By close of business on 3rd business day following receipt of samples
Review additional information
Information concerning how samples are taken, the difference between legal and informational testing, buccal versus "pin-prick" sample collection, and more is available and should be reviewed.
Our Refund Policy
Samples must be submitted within 3 months of case initiation or the case will be closed. Refunds will be issued only if applied for within 15 days of the order date. Refunds for orders involving test kits only will not be issued. Full details on our refund policy can be found here.
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