Paternal Lineage Y-STR Test
Short Name: Y-STR Paternal Lineage
Also known as: Y-Chromosome STR Test, Y-STR DNA Test, Paternal Ancestry Test
Paternal Lineage Y-STR Test test available at DNA Labs India for ₹24,000. Uses PCR amplification of Y-STR markers, Capillary electrophoresis on Buccal Swab, Blood EDTA Tube, Blood FTA Card samples. Results in Results are typically delivered within 10 working days after the sample reaches the laboratory.. Free home collection in 300+ cities across India.
🩺 Medically Reviewed By
Dr Pasupathy Arumugam
Consultant Pathologist · Reg: 21521
Last reviewed: September 7, 2026
Overview
The primary purpose of the Y-STR test is to establish whether two or more males are related through their paternal line. Since the Y-chromosome is inherited virtually unchanged from father to son, males sharing a common paternal ancestor will have identical or near-identical Y-STR profiles. This test is commonly used to confirm father-son relationships, paternal half-brothers, paternal uncle-nephew relationships, grandfather-grandson relationships, and paternal cousins. It is also useful in cases where the alleged father is unavailable for testing, by comparing the Y-STR profile of the child with that of a known paternal male relative. The test can also provide information about the individual's haplogroup, which indicates deep ancestral origins and migration patterns.
- Test Code
- 6263
- CPT Code
- 81479
- ICD Code
- Z13.89
- Price
- ₹24,000
- Sample Type
- Buccal Swab, Blood EDTA Tube, Blood FTA Card
- Result Time
- Results are typically delivered within 10 working days after the sample reaches the laboratory.
- Fasting Required
- No
- Method
- PCR amplification of Y-STR markers, Capillary electrophoresis
Sample Collection
No special preparation is required. However, it is important to provide valid identification and sign consent documents for all participants. For blood samples, avoid eating a heavy meal immediately before collection, though fasting is not mandatory.
Method: Cheek swab or venipuncture
Laboratory Analysis
A trained phlebotomist will collect a blood sample or a buccal swab. The procedure is quick and minimally invasive. For buccal swabs, the inside of the cheek is rubbed with a sterile swab for a few seconds.
Report Delivery
No specific aftercare is needed. You can resume normal activities immediately. The sample will be sent to the laboratory for analysis.
Timeline: Results are typically delivered within 10 working days after the sample reaches the laboratory.
Patient Instructions
About This Test
Who Should Get This Test
The primary purpose of the Y-STR test is to establish whether two or more males are related through their paternal line. Since the Y-chromosome is inherited virtually unchanged from father to son, males sharing a common paternal ancestor will have identical or near-identical Y-STR profiles. This test is commonly used to confirm father-son relationships, paternal half-brothers, paternal uncle-nephew relationships, grandfather-grandson relationships, and paternal cousins. It is also useful in cases where the alleged father is unavailable for testing, by comparing the Y-STR profile of the child with that of a known paternal male relative. The test can also provide information about the individual's haplogroup, which indicates deep ancestral origins and migration patterns.
How to Prepare
- All participants must provide valid ID proof
- Consent documents must be signed by all participants
- For buccal swabs, do not eat, drink, or smoke 30 minutes before collection
- For blood samples, use EDTA tube and ensure proper labeling
Doctor's Notes
Reviewed by Dr Pasupathy Arumugam — MBBS, MD (Pathology) · Reg. No. 21521
"The Y-STR test is a powerful tool for tracing paternal lineage. It is important to understand that while it confirms a shared paternal line, it does not specify the exact relationship. Results should be interpreted in the context of family history and other genetic evidence."
Last medically reviewed: September 7, 2026
Test Parameters & Specifications
Sample Stability
- Hemolyzed blood samples
- Insufficient quantity of sample
- Improper labeling or missing consent forms
- Contaminated swabs
Understanding Your Results
Matching Y-STR profiles
The tested males are likely related through their paternal line. The probability of a match by chance is extremely low, providing high confidence in the relationship.
Mismatch at one marker
May indicate a rare mutation or a very distant relationship. Additional testing may be recommended.
Mismatch at two or more markers
The tested males are not related through their paternal line. This is a definitive exclusion.
If you have questions about your paternal lineage or need to confirm a biological relationship, it is advisable to consult a genetic counselor or a healthcare provider who can help interpret the results and discuss implications.
Limitations
- ⚠Cannot determine the exact degree of relationship (e.g., father vs. brother)
- ⚠Cannot distinguish between males from the same paternal line if they are closely related
- ⚠Not useful for maternal lineage testing
- ⚠Results may be inconclusive if samples are degraded
Risks & Considerations
- ●Minimal risk of bruising or infection at the blood draw site
- ●No significant risks associated with buccal swab collection
Interfering Factors
- ●Contamination of sample with maternal DNA
- ●Recent blood transfusion (if blood sample used)
- ●Bone marrow transplant from a female donor
- ●Insufficient DNA quantity or quality
Compare With Similar Tests
| Test | Paternal Lineage Y-STR Test | Autosomal DNA Test | Mitochondrial DNA (mtDNA) Test | Full Y-Chromosome Sequencing |
|---|---|---|---|---|
| Comparison | Paternal Lineage Y-STR Test |
Frequently Asked Questions
What is the cost of the Paternal Lineage Y-STR Test?
How is the Y-STR test different from a paternity test?
Can the Y-STR test determine the exact relationship between two males?
What sample is required for the Y-STR test?
How long does it take to get results?
Is fasting required before the test?
Can the test be done for a child?
Is the test confidential?
Can the Y-STR test be used for legal purposes?
What is a haplogroup?
Are there any risks associated with the test?
Can the test be done if the alleged father is not available?
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