Sibling DNA Testing – Choose the Best Option for You


Both options give you everything required to collect cheek-swab samples quickly and safely at home. Select the approach that fits your situation.

Person using a smartphone showing a ‘Buy Now Pay Later’ screen, representing low-cost payment options for home paternity DNA testing.

Option 1. Low-Cost Sibling DNA Test Kit — Pay Lab Fee Later

Order your sibling DNA sample collection kit today and pay the laboratory analysis fee later, once your samples are returned.

● Low-cost sibling DNA sample collection kit – £4.99

● Free UK Royal Mail First Class postage included

● 45 genetic markers tested as standard for enhanced accuracy

● Laboratory analysis fee paid later, once samples are returned

● Option to split the laboratory fee (where available)

● No laboratory analysis fee to pay upfront

● Results typically issued the next working day once samples are received and approved

Order Pay-Later Sibling DNA Test Kit
Home sibling DNA test kit components laid out, including swabs, envelopes and paperwork.

Option 2. Pay Lab Fee Upfront — Free Postage Included

Pay the full laboratory analysis fee upfront and enjoy free UK postage, with nothing further to pay when returning your samples.

● DNA sample collection kit included

● Free UK Royal Mail First Class postage included

● 45 genetic markers tested as standard for enhanced accuracy

● Laboratory analysis fee paid in full at checkout

● Nothing further to pay when returning samples

● Results typically issued the next working day once samples are received and approved

● Optional instalment payments available (subject to eligibility)

Order Sibling DNA Test – Pay in Full £149
ISO 17025 accredited UK lab technician handling DNA test samples for paternity testing.

Simple, Reliable Sibling DNA Testing — Two Flexible Payment Options

Both sibling DNA test options use the same UKAS ISO 17025-accredited laboratory process and deliver the same highly accurate, reliable results. The only difference is when you choose to pay, allowing you to select the option that best suits your circumstances - without compromising accuracy, turnaround time, or reliability.

Each kit includes everything needed to collect cheek-swab DNA samples easily, comfortably, and discreetly at home, with clear step-by-step instructions provided.

Sibling DNA testing can help determine whether two individuals share both biological parents, one biological parent (half-siblings), or are not biologically related.

All samples are analysed in our UKAS ISO 17025-accredited UK laboratory using 45 genetic markers as standard, providing enhanced accuracy for more complex sibling relationship testing. Results are typically issued the next working day once all valid samples have been received and approved for analysis.

Why families choose DNA Clinics for sibling DNA testing

✔ Low-cost ordering options
Choose between a low-cost sibling DNA sample collection kit (£4.99, free UK postage) with the option to pay the lab fee later, or pay the full lab fee upfront with nothing further to pay.

✔ Flexible payment choices
Pay the laboratory fee upfront, or split the cost by paying when your samples are returned and once testing is complete (subject to eligibility).

✔ Enhanced accuracy with 45 DNA markers
Sibling DNA tests are analysed using 45 DNA markers, providing improved discrimination between full siblings, half siblings, and unrelated individuals.

✔ Fast Accredited laboratory testing
All testing is carried out in a UKAS ISO 17025-accredited UK laboratory, with results typically issued the next working day once samples are received and ready for analysis.

✔ Clear guidance and UK-based support
Our experienced team is available to answer questions, explain results, and guide you through the sibling DNA testing process at every stage.

✔ Option to switch to a clinic appointment
If you later need legally recognised sibling DNA testing, we can arrange a compliant clinic-based test through our nationwide network.

Sibling DNA Testing – Frequently Asked Questions

1. How accurate is a sibling DNA test?

Sibling DNA tests are highly reliable when assessing whether individuals share one or both biological parents. Testing is performed using 45 DNA markers, allowing the laboratory to calculate the statistical likelihood of a full sibling, half sibling, or unrelated relationship.

While sibling testing cannot provide the same absolute certainty as paternity or maternity testing, it delivers strong, laboratory-verified evidence when clear cheek-swab samples are provided.

All analysis is carried out in a UKAS ISO 17025-accredited UK laboratory, ensuring high standards of accuracy and quality control.

2. What relationships can a sibling DNA test determine?

A sibling test can help confirm whether individuals are:

  • Full siblings (same biological mother and father)
  • Half siblings (one biological parent in common)
  • Unrelated (no biological parent in common)

Where possible, including the biological mother can improve the strength of the comparison, but the test can still be performed without her involvement unless stated otherwise.

3. How long do sibling DNA test results take?

Results are typically issued the next working day once all samples have been received by the laboratory and are ready for analysis.

Samples must pass standard quality and documentation checks before testing begins.

If anything requires clarification — for example, incomplete forms or unclear swabs — our team will contact you promptly to avoid unnecessary delays.

4. Can I pay later or split the lab test fee?

Yes. You can order a low-cost sibling DNA sample collection kit for £4.99 with FREE UK postage, and pay the laboratory analysis fee later, once your samples are returned.

Where available, you may also choose to split the laboratory fee, paying part when samples are returned and the balance when results are ready.

Eligible customers may also be able to spread the cost using PayPal Pay Later, Klarna, or other split-payment methods shown at checkout.

These flexible options are designed to make sibling testing accessible regardless of your budget.

5. Does everyone need to be present to take part in a sibling DNA test?

No — each participant can collect their cheek-swab sample separately and at their own convenience.

If siblings live at different addresses, simply request extra swabs when ordering or contact us if you need to arrange additional kits.

Each participant must follow the instructions carefully to ensure proper sample collection and avoid delays during laboratory processing.

6. Can this sibling test be used for court, immigration, or legal reasons?

No. Home sibling DNA tests are intended for personal information and peace-of-mind purposes only and cannot be used as legal evidence.

If you require a legally recognised sibling DNA test (for example, for court, immigration, or official applications), please contact our team on 0800 988 7107 for advice on the correct testing route.

7. Will anyone else know I’ve taken a sibling DNA test?

Your test is completely confidential.

We do not share your data or results with any third parties, and results are sent securely by email to the person who ordered the test.

All personal information is handled in line with UK GDPR and our strict privacy policy.

If you would like results issued to more than one individual, our team can help set this up.

8. What happens after I send the samples back?

Once all samples reach the laboratory:

  1. They undergo a quality and documentation check
  2. DNA is extracted and analysed
  3. A statistical comparison is performed
  4. A secure report is issued to you by email within the expected timeline

If the lab identifies an issue — such as insufficient DNA or unclear handwriting — we will contact you straight away to resolve it.