Prader-Willi Syndrome (FISH) Test
Also known as: PWS FISH Test, Prader-Willi Syndrome FISH
Prader-Willi Syndrome (FISH) Test test available at DNA Labs India for ₹5,250. Uses FISH on Peripheral blood, Amniotic fluid, Chorionic villi, Cord blood samples. Results in 3-4 days. 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 purpose of the Prader-Willi Syndrome (FISH) test is to diagnose PWS by detecting deletions or abnormalities on chromosome 15 using Fluorescence In Situ Hybridization. It helps confirm clinical suspicion, guide treatment plans, and provide genetic counseling.
- Test Code
- 3156
- Price
- ₹5,250
- Sample Type
- Peripheral blood, Amniotic fluid, Chorionic villi, Cord blood
- Result Time
- 3-4 days
- Fasting Required
- No
- Method
- FISH
Sample Collection
A doctor's prescription is required for the Prader-Willi Syndrome (FISH) test. Prescription is not applicable for surgery, pregnancy cases, or individuals planning to travel abroad.
Method: Venipuncture or as per sample type
Laboratory Analysis
Sample collection is performed via venipuncture for blood samples or as appropriate for other sample types, following standard aseptic techniques.
Report Delivery
Apply pressure to the collection site to prevent bleeding. Keep the sample as instructed and transport to the lab promptly.
Timeline: 3-4 days
Patient Instructions
About This Test
Who Should Get This Test
The purpose of the Prader-Willi Syndrome (FISH) test is to diagnose PWS by detecting deletions or abnormalities on chromosome 15 using Fluorescence In Situ Hybridization. It helps confirm clinical suspicion, guide treatment plans, and provide genetic counseling.
How to Prepare
- Keep sample at ambient temperature or with cool pack
- Use the specified sterile container or vacutainer
- Ensure proper labeling and documentation
Doctor's Notes
Reviewed by Dr Pasupathy Arumugam — MBBS, MD (Pathology) · Reg. No. 21521
"Early diagnosis of Prader-Willi Syndrome through FISH testing is crucial for managing symptoms and improving quality of life. Consult a genetic specialist for personalized care."
Last medically reviewed: September 7, 2026
Test Parameters & Specifications
Sample Stability
- Hemolyzed or clotted samples
- Improperly labeled or contaminated samples
- Insufficient sample volume
Understanding Your Results
Positive
Deletion detected on chromosome 15, confirming Prader-Willi Syndrome diagnosis.
Negative
No deletion detected; PWS is unlikely, but other genetic tests may be recommended if symptoms persist.
Consult a doctor if you or your child exhibits symptoms of Prader-Willi Syndrome, such as low muscle tone, excessive hunger, or developmental delays, or if the FISH test result is positive.
Limitations
- ⚠May not detect all genetic causes of PWS, such as uniparental disomy
- ⚠Requires specialized laboratory equipment and expertise
- ⚠Results may need confirmation with additional genetic tests
Risks & Considerations
- ●Minor bruising or pain at the blood collection site
- ●Rare risk of infection
- ●Minimal discomfort during sample collection
Interfering Factors
- ●Poor sample quality or contamination
- ●Technical errors in FISH procedure
- ●Improper sample storage or handling
Frequently Asked Questions
What is Prader-Willi Syndrome?
What is the FISH test for PWS?
How is the FISH test performed?
What are the symptoms of Prader-Willi Syndrome?
How much does the PWS FISH test cost in India?
Is home sample collection available for this test?
What is the turnaround time for results?
Do I need a doctor's prescription for this test?
What samples are accepted for the test?
What does a positive FISH test result mean?
Are there any risks associated with the test?
How can I book the PWS FISH test?
Related Tests
Reference Laboratory Services
We serve as a reference laboratory for hospitals and clinics across India. Send samples from your facility with same-day pickup, priority processing, and results delivered through our online portal. Competitive institutional pricing available.
Your Data Privacy
Your medical data is protected under Indian law.
✓ Stored in India: All patient records are stored on servers located in India. No data is transferred outside the country.
✓ DPDP Act Compliant: Under the Digital Personal Data Protection Act 2023, you can request deletion of your records at any time by contacting support.
Book Your Test
Enter your details and we'll connect you within 15 minutes.