Forensic Twin DNA Test
Identical or Fraternal Twins

Determine Whether Twins Are Identical or Fraternal Using Forensic DNA Samples

Starting at $259

Our Forensic Twin DNA Test determines whether two individuals are identical (monozygotic) or fraternal (dizygotic) twins using DNA recovered from personal items or other non-standard samples.

This test is ideal when one or both individuals are unavailable for traditional cheek swab collection. Common forensic samples include toothbrushes (recommended), hair with roots, razors, dried bloodstains, and other personal belongings.

Our standard test includes DNA analysis for two individuals.

What Does the Forensic Twin DNA Test Determine?

Our laboratory compares DNA profiles to determine whether the individuals are:

• Identical Twins (Monozygotic): Twins who originate from the same fertilized egg and generally have matching DNA profiles at the markers examined.

• Fraternal Twins (Dizygotic): Twins who originate from separate fertilized eggs and typically have different DNA profiles, similar to other full biological siblings.

Please note: Standard DNA testing generally cannot distinguish one identical twin from the other.

For more information, visit our Forensic Twin DNA Testing information page.

What's Included in Your Test?

Our standard two-person Forensic Twin DNA Test includes:

• DNA testing for two individuals

  • 1 Non-Standard Sample and 1 Oral Swab Sample

• Forensic DNA extraction for the selected special sample(s)

• Comparison of the DNA profiles

• A written DNA test results report

• Collection instructions and an oral swab kit, if selected

Additional samples or specialized testing may incur additional fees.

Important Information About Forensic DNA Testing

Due to the nature of forensic DNA samples, a conclusive result cannot be guaranteed.

Samples may contain insufficient, degraded, or mixed DNA, which can prevent the laboratory from obtaining a usable DNA profile.

Unsuccessful DNA extraction or inconclusive results do not automatically qualify for a retest or refund. Please review our Refund and Cancellation Policy before ordering.

Legal Testing: This informational test is not intended for court use. If you require testing for legal purposes, please consult an attorney before ordering.

Special Sample Collection & Shipping Instructions

After ordering, you will receive instructions for preparing and submitting your samples.

Place each dry forensic sample in a separate paper envelope or paper bag. Avoid placing biological samples directly into plastic bags.

Label each sample with:

• Your order number

• A brief description of the item

• The date of collection

• The approximate age of the sample, if known

Place the packaged samples in a protective shipping envelope or box and use a trackable shipping service.

Send your samples to:

Validity Genetics Services
500 S Main St
Las Cruces, NM 88001

For more detailed instructions, visit our Guide to Gathering Special DNA Samples.

Specialized Samples: Teeth, bones, bone marrow, organs, muscle tissue, feces, and preserved tissue samples are not included in standard special sample testing. Please contact us before ordering testing for these materials.

Testing Time & Results

Forensic Twin DNA Test results are generally available within 5–7 business days after all required samples are received and checked in at our laboratory.

Business days are Monday through Friday, excluding weekends and holidays.

Results are delivered confidentially to the purchaser by email as a PDF report. Rush testing may be available for an additional fee when arranged before laboratory processing begins.

Our testing kits are shipped in discreet, unmarked packaging and may not appear exactly as pictured.