Chromosome 21 Test
Short Name: Chromosome 21 Test
Also known as: Down syndrome test, Trisomy 21 test, Chromosome 21 analysis
Chromosome 21 Test test available at DNA Labs India for ₹5,500. Uses FISH on 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 Chromosome 21 test is to diagnose abnormalities in chromosome 21, such as trisomy 21 (Down syndrome), to enable early intervention, genetic counseling, and appropriate medical management.
- Test Code
- 2966
- Price
- ₹5,500
- Sample Type
- 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 Chromosome 21 test, except in cases of surgery, pregnancy, or travel abroad. No fasting is needed.
Method: Invasive procedures such as amniocentesis, chorionic villus sampling (CVS), or cord blood collection
Laboratory Analysis
Sample collection is performed via invasive procedures like amniocentesis, CVS, or cord blood draw by a healthcare professional.
Report Delivery
Post-collection, samples are handled with care and transported under appropriate conditions (ambient or cool pack) to the laboratory for analysis.
Timeline: 3-4 days
Patient Instructions
About This Test
Who Should Get This Test
The purpose of the Chromosome 21 test is to diagnose abnormalities in chromosome 21, such as trisomy 21 (Down syndrome), to enable early intervention, genetic counseling, and appropriate medical management.
How to Prepare
- Use sterile containers or sodium heparin vacutainers as specified.
- Ensure proper labeling and transport under ambient or cool conditions.
- Follow aseptic techniques to avoid contamination.
Doctor's Notes
Reviewed by Dr Pasupathy Arumugam — MBBS, MD (Pathology) · Reg. No. 21521
"Early diagnosis of Chromosome 21 abnormalities is crucial for timely intervention and management, especially in conditions like Down syndrome."
Last medically reviewed: September 7, 2026
Test Parameters & Specifications
Understanding Your Results
Normal
Two copies of chromosome 21 detected, no abnormalities.
Abnormal (e.g., Trisomy 21)
Three copies of chromosome 21 detected, indicating Down syndrome or related condition.
Consult a doctor if you or your child exhibit symptoms such as intellectual disability, distinct facial features, heart defects, or developmental delays, or if prenatal screening suggests a risk for chromosome 21 abnormalities.
Risks & Considerations
- ●Potential risks from invasive procedures include infection, bleeding, or miscarriage in prenatal cases, though rare.
Frequently Asked Questions
What is the Chromosome 21 test?
Why is the Chromosome 21 test done?
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How is the Chromosome 21 test performed?
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Is home collection available for the Chromosome 21 test?
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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.
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✓ DPDP Act Compliant: Under the Digital Personal Data Protection Act 2023, you can request deletion of your records at any time by contacting support.
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