Family relationship testing

Sibling DNA test cost and interpretation

A sibling DNA test evaluates whether two people are likely to share one or both biological parents. It can be useful when a parent is unavailable, family records are incomplete, or relatives want to investigate a possible relationship. Sibling testing is usually a probabilistic comparison rather than a direct parent-child test. The strength of the assessment depends on the relationship being considered, the participants available and the genetic information obtained. A genetic counsellor or laboratory professional can explain the report in context.

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At a glance

The important details, plainly stated.

Can assess full-sibling, half-sibling or unrelated possibilities

Testing a known parent may improve the design where available

Results are not a substitute for identity documents or family history

Legal use requires consent, identity checks and documented collection

Full or half sibling questions

The laboratory needs to know whether the question concerns a shared mother, shared father, both parents or simply any biological relationship. Different participant combinations can support different analyses, so describe the question honestly at booking.

Why relatives can matter

A known biological parent, grandparent or additional sibling can sometimes make interpretation more informative. This is not a guarantee of a conclusive result; the laboratory will advise what samples are useful before collection.

Questions patients ask

Before you decide

What is the cost of a Sibling DNA Test at DNA Labs India?

The cost is INR 24000, which includes sample collection, laboratory analysis, and a detailed report. Free home sample collection is available for online bookings.

How is a Sibling DNA Test performed?

A simple cheek swab or blood sample is collected from each sibling. The samples are sent to our NABL-accredited laboratory for DNA analysis using STR markers.

How long does it take to get results?

Results are typically available within 10 days after samples reach the laboratory.

Is fasting required before the test?

No, fasting is not required for a Sibling DNA Test.

Can the test be done for legal purposes?

Yes, the test can be used for legal purposes such as inheritance disputes or immigration. However, legal cases may require a chain-of-custody process. Please contact us for more details.

What is the accuracy of the Sibling DNA Test?

The test is highly accurate, with a probability of relationship exceeding 99% for full siblings and 95% for half siblings.

What is the difference between full and half sibling DNA testing?

Full siblings share both parents, while half siblings share only one parent. The test can distinguish between these relationships based on the DNA markers analyzed.

Can children be tested?

Yes, children can be tested with consent from a parent or legal guardian.

Is home sample collection available?

Yes, we offer free home sample collection for online bookings across major cities in India.

What documents are required?

All participants must provide a valid government-issued ID proof and sign consent documents.

How should I prepare for the test?

No special preparation is needed. For buccal swabs, avoid eating, drinking, or smoking for 30 minutes before collection.

Are the results confidential?

Yes, we maintain strict confidentiality. Results are shared only with the authorized individuals.

Editorial accountability

Written by

Nitin Yadav

Medical Content Writer · MSc Biotechnology

Reviewed by

Dr Pasupathy Arumugam

Consultant Pathologist · Reg. 21521

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