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Relationship Testing

Recent Reviews

DNA Paternity Testing
rated rated rated rated not rated 4.4 out of 5
I was not expecting the results so soon. Great job and great price! Glad I went with you all and not other companies that had bad reviews.
- Tameka, September, 2012
DNA Paternity Testing
rated rated rated rated rated 5 out of 5
Thank you for providing affordable testing for the public. From birth, my sister and I were told we were fraternal - now after 61 years - we have the answer our mother always thought was true. We are identical!
- Bonnie, July, 2012
DNA Paternity Testing
rated rated rated rated not rated 4.3 out of 5
I received excellent professional treatment from beginning to end. Also, the instructions were simple to understand and follow. Thank You!
- Carol, December, 2012
DNA Paternity Testing
rated rated rated rated not rated 4.2 out of 5
Thank you so much for you timely response! Now I know for sure that my darlings little boy is really my grandson. Thanks again!
- Linda, January, 2013
DNA Paternity Testing
rated rated rated rated rated 5 out of 5
I am very pleased with the lab. The results were easy to read and completed in a timely manner. These results confirmed what we suspected without delay. Now this child can move on to find her real biological father.
- Bobbi, December, 2012
DNA Paternity Testing
rated rated rated rated rated 5 out of 5
If I feel the need, I would definitely use this lab again. I will also give high recommendations for the prompt and excellent service that is provided.
- Allyn, January, 2013

Siblingship DNA Testing

sisters.jpgDNA siblingship tests determine the statistical probability of whether siblings (brothers and sisters) share the same two parents or not. The cost of the DNA testing service includes two siblings, but you may add more as needed; for instance a third sibling.

When the issue of siblingship is in question, the recommended method to determine whether individuals are true biological siblings is to test their parents. In situations where the alleged parents are unavailable for testing, a DNA siblingship test can be performed to analyze the relationship of biological siblings.

Including one common parent greatly increases the accuracy of this type of analysis and is recommended if at all possible. If this is not possible, disclosing that siblings share a common mother or father can also lead to more meaningful results.

Unlike a paternity test which will always provide a conclusive result, siblingship tests are different. When a siblingship test is conducted, the DNA laboratory will determine the genetic profile of the alleged siblings. Based on the type of genetic material inherited by each sibling, a siblingship DNA index is determined. If the siblingship DNA index is less than 1.00, this indicates non-relatedness. If the siblingship DNA index is greater than 1.00, this indicates that the two tested individuals are more likely to be true biological siblings. The higher the value of the siblingship DNA index, the greater the likelihood that the two individuals are true biological siblings. To analyze the possibility that the siblings share only one common parent versus two common parents (mother and father), a half siblingship DNA index is obtained. The ratio of the half siblingship DNA index versus the full siblingship DNA index would provide you with an idea of whether the two individuals are more likely to share only one common parent (e.g. mother only) or two common parents (mother and alleged father).

Our siblingship tests are preformed using what's known as an "All-vs-All" methodology. For example, if you have two siblings, Alice and Bob, one report will be generated which details the relationship between Alice and Bob. With three siblings you would receive 3 reports which describe the relationships between: Alice & Bob, Alice & Charlie and Bob & Charlie. Four siblings would yield 6 reports: Alice & Bob, Alice & Charlie, Alice & David, Bob & Charlie, Bob & David, and Charlie & David. The amount of reports would subsequently grow exponentially. If you have any questions regarding these reports, please feel free to contact us.

Please note: In some cases, a Y-STR DNA Test can provide more conclusive results for males determining common paternal lineage. If siblings are trying to determine whether or not they share the same maternal lineage, an X-SV DNA Test may be the analysis of choice.

New York State Residents

New York State has specific requirements for DNA testing including: collection by a third party under chain of custody; the specimen must be accompanied by a test order from your physician or lawyer; and specimens must be submitted to and analyzed by a laboratory holding a NYS permit. For more information on the NYS policy, call (518) 485-5357.

Step One: 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 Contiguous U.S.

* All orders, shipping within the Contiguous USA, include a pre-paid return mailer based on your selected shipping method for NO EXTRA CHARGE
* You may choose how you want your kit sent to you. US Mail will take approximately 7-15 business days. For faster delivery of your kit, you may choose Priority Mail or UPS overnight (UPS requires a street address and telephone number)

For shipping outside of the Contiguous U.S:

Orders to Canada, Mexico, Hawaii, Alaska, Puerto Rico and recognized US territories can be shipped by US Mail or UPS (additional international fees apply for UPS) but may not contain a prepaid return package. 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 UPS you will receive the paternity test kit the following day. Orders placed on Fridays for UPS overnight shipment will arrive Monday. GTL does not ship or receive on weekends and most federal holidays.

Multiple locations:

You may order additional kits, which will include prepaid returns based on your selected method of shipping (for use in the Contiguous United States only). Additional kits are $30 for informational and $40 for legally binding. To order additional kits, please call GTL Toll-Free at (866) 833-6895.

* Although you may place your order before noon, GTL may not receive the order notification for several hours.

Step Two: Select a DNA Test

Please Note: All orders, shipping within the Contiguous USA, include a pre-paid return via your selected method of shipping.

Informational DNA Test

2-person test. The cost of the service includes both siblings, but you may add more as needed; for instance a third sibling or one parent. Including one common parent greatly increases the accuracy of this type of analysis and is recommended if at all possible.
  1. Buccal Swabs or Blood Samples? Read Morewhat is this?

  2. Will a parent also be tested?

  3. Additional Siblings? Learn more about our "All-vs-All" testing method and additional reports. Read Morewhat is this?

  4. Add optional rush analysis: Full explanation of rush analysis can be found below. Read Morewhat is this?

  5. Shipping Method (we strongly recommend you choose to ship via a trackable carrier, such as UPS or FedEx. We cannot track US Mail or Priority Mail.): Read Morewhat is this?

Legally Binding DNA Test

If you believe you'll need your test results to be legally binding, you'll need the Legally Binding Test. Click here to learn more about this type of siblingship test. type
  1. Buccal Swabs or Blood Samples? Read Morewhat is this?

  2. Will a parent also be tested?

  3. Additional Siblings? Learn more about our "All-vs-All" testing method and additional reports. Read Morewhat is this?

  4. Add optional rush analysis: Full explanation of rush analysis can be found below. Read Morewhat is this?

  5. Shipping Method (we strongly recommend you choose to ship via a trackable carrier, such as UPS or FedEx. We cannot track US Mail or Priority Mail.): Read Morewhat is this?

  6. Please select "I agree" if you have read and agree to the GTL Legal Test Agreement:

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. Find out more about the requirements of legal paternity testing.

Helpful Links

* Finding the answers is important. Discover the benefits of our paternity testing services.

Our Refund Policy

DNA test samples must be submitted within one-year of case initiation or the case will be closed. Refunds for DNA or paternity test kits, Internet specials, and International orders will not be issued: all sales are final. Full details on our refund policy can be found here.

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

  • Accredidations and affiliations

    Quality is Assured

    Click here to see a list of our accreditations and affiliations

  • Testimonials

    Satisfaction Guaranteed

    Click here to read selected testimonials about our services and products

  • Accredidations and affiliations

    How Do the Tests Work?

    Click here to read easy-to-understand instructions about our tests