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DNA Labs India

Chromosomes 13 & 21 Test

DNA Labs India | ISO 9001:2015 Certified

Chromosomes 13 & 21 Test

Also known as: FISH for Chromosomes 13 and 21, Prenatal Chromosomal Analysis

Chromosomes 13 & 21 Test test available at DNA Labs India for ₹6,000. Uses FISH on Amniotic fluid / Chorionic villi / Cord blood samples. Results in 3-4 days. Free home collection in 300+ cities across India.

Oncology🏠 Home Collection

✍️ Written By

🩺 Medically Reviewed By

Dr Pasupathy Arumugam

Dr Pasupathy Arumugam

Consultant Pathologist · Reg: 21521

Last reviewed: September 7, 2026

Overview

The purpose of Chromosomes 13 & 21 testing is to identify numerical or structural abnormalities in chromosomes 13 and 21, which can lead to genetic disorders such as Down syndrome (trisomy 21) and Patau syndrome (trisomy 13). This test aids in prenatal diagnosis, risk assessment, and genetic counseling, enabling early medical intervention and informed decision-making for patients and healthcare providers.

Test Code
2965
Price
₹6,000
Sample Type
Amniotic fluid / Chorionic villi / Cord blood
Result Time
3-4 days
Fasting Required
No
Method
FISH
Step 1

Sample Collection

A doctor's prescription may be required, except for pregnancy cases or individuals planning to travel abroad. Ensure proper documentation is provided.

Step 2

Laboratory Analysis

Sample collection is performed by a trained phlebotomist or healthcare professional using sterile techniques to avoid contamination.

Step 3

Report Delivery

Samples are transported to the laboratory under appropriate conditions (ambient or cool pack) for analysis.

Timeline: 3-4 days

Patient Instructions

1
Before the Test:Obtain a doctor's prescription if required. Inform the healthcare provider about any medications or medical conditions.
2
During the Test:The test involves sample collection (blood, amniotic fluid, etc.) and laboratory analysis using FISH method; it is generally painless with minimal risks.
3
After the Test:Results are available in 3-4 days. Follow up with your doctor to discuss findings and next steps.

About This Test

Who Should Get This Test

The purpose of Chromosomes 13 & 21 testing is to identify numerical or structural abnormalities in chromosomes 13 and 21, which can lead to genetic disorders such as Down syndrome (trisomy 21) and Patau syndrome (trisomy 13). This test aids in prenatal diagnosis, risk assessment, and genetic counseling, enabling early medical intervention and informed decision-making for patients and healthcare providers.

How to Prepare

  • Use sterile containers for sample collection
  • For amniotic fluid, chorionic villi, or cord blood, follow aseptic procedures
  • Label samples correctly with patient details

Doctor's Notes

Reviewed by — MBBS, MD (Pathology) · Reg. No. 21521

Last medically reviewed: September 7, 2026

Test Parameters & Specifications

Sample TypeAmniotic fluid / Chorionic villi / Cord blood
ContainerSterile container / Sterile Normal Saline Container / Sodium heparin Vacutainer (2ml)
Sample Rejection Criteria:
  • Contaminated samples
  • Improperly labeled specimens
  • Insufficient sample volume

Understanding Your Results

Results from Chromosomes 13 & 21 testing indicate whether there are abnormalities in the number or structure of these chromosomes. Normal results show two copies of each chromosome, while abnormal results may suggest conditions like Down syndrome or Patau syndrome.
📊

Normal

Two copies of chromosomes 13 and 21 detected, indicating no abnormalities.

📊

Abnormal

Additional or missing copies detected, suggesting chromosomal disorders; further genetic counseling and testing recommended.

⚠️ When to Consult a Doctor:

Consult a doctor if you experience symptoms of chromosomal abnormalities, have a family history of genetic disorders, are pregnant with risk factors, or receive abnormal test results for appropriate management and counseling.

Limitations

  • ⚠Test may not detect all chromosomal abnormalities
  • ⚠Results require confirmation with additional tests in some cases

Risks & Considerations

  • ●For invasive sample collection (e.g., amniocentesis), risks include infection, miscarriage, or discomfort
  • ●Minimal risks for blood sample collection

Frequently Asked Questions

What is Chromosomes 13 & 21 testing?
It is a diagnostic test that analyzes chromosomes 13 and 21 to detect abnormalities like Down syndrome using methods such as FISH.
How much does the test cost?
The cost at DNA Labs India is INR 6000, with free home sample collection available.
Is the test painful?
For blood samples, it involves a simple needle prick; for prenatal samples like amniocentesis, there may be mild discomfort.
Who should get this test?
Pregnant women with risk factors, individuals with symptoms of chromosomal abnormalities, or those with a family history of genetic disorders.
How is the test performed?
Samples such as blood, amniotic fluid, or chorionic villi are collected and analyzed in the lab using FISH technology.
What are the risks of the test?
Risks are minimal for blood tests; invasive procedures like amniocentesis carry small risks of infection or miscarriage.
How long does it take to get results?
Results are typically available within 3-4 days after sample collection.
Do I need a doctor's prescription?
A prescription may be required, except for pregnancy cases or travel abroad plans.
What does a normal result mean?
A normal result indicates two copies of chromosomes 13 and 21, with no detected abnormalities.
What if the result is abnormal?
Abnormal results suggest chromosomal disorders; consult a doctor for genetic counseling and further testing.
Is home sample collection available?
Yes, DNA Labs India offers free home sample collection in many cities across India.
Can this test detect all genetic disorders?
No, it specifically targets chromosomes 13 and 21; other tests may be needed for comprehensive genetic analysis.
Worried about the process? Our certified phlebotomists collect thousands of samples every month across India. The process takes under 5 minutes and is virtually painless. Questions? Message us on WhatsApp — we're here 7 days a week.

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For Hospitals & Clinics

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.

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✓ 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.

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