FISH Aneuploidy Detection XY Test
About FISH Aneuploidy Detection XY Test
| Field | Value |
|---|---|
| Also Known As | FISH XY Aneuploidy Test, Sex Chromosome Aneuploidy Detection by FISH Test, Fluorescence In Situ Hybridisation for X and Y Chromosomes Test |
| Sample Type | Peripheral Blood |
| Fasting Required | No fasting required |
| Report Time | 3 days |
| Recommended For | All genders; newborns, children, and adults with suspected chromosomal disorders |
| Price | Starting at ₹4,500 |
What is a FISH Aneuploidy Detection XY Test?
The FISH Aneuploidy Detection XY test uses a technique called Fluorescence In Situ Hybridisation (FISH) to examine the number of X and Y sex chromosomes in a person's cells.
The test is performed on a peripheral blood sample collected in a sodium heparin tube. It is typically requested when a doctor suspects a sex chromosome disorder in a newborn, child, or adult. The test is also known as the FISH XY Aneuploidy test and the Sex Chromosome Aneuploidy Detection by FISH test.
What Does a FISH Aneuploidy Detection XY Test Measure?
This test uses fluorescently labelled DNA probes that bind to specific regions on the X and Y chromosomes, making them visible under a microscope. The laboratory then counts the number of signals per cell to determine if the chromosome count is normal. The test analyses the following:
- Chromosome X copy number — detects extra or missing X chromosomes, as seen in conditions such as Turner syndrome (45,X) or Triple X syndrome (47,XXX)
- Chromosome Y copy number — detects the presence, absence, or extra copies of the Y chromosome, as seen in XYY syndrome (47,XYY)
- Sex chromosome pattern — confirms whether the chromosome pattern is XX (typically female), XY (typically male), or an abnormal variant
Why is a FISH Aneuploidy Detection XY Test Done?
A doctor may request this test when clinical signs suggest an abnormality in the sex chromosomes. It helps identify specific chromosomal conditions that affect development, growth, and fertility.
Common Symptoms That May Require This Test
The following symptoms may prompt a doctor to order this test:
- Short stature or unusually tall stature for age
- Delayed puberty or absent puberty
- Infertility or difficulty conceiving
- Recurrent miscarriages
- Ambiguous genitalia at birth
- Developmental delays or learning difficulties
- Suspected chromosomal abnormality on an ultrasound scan
Conditions This Test Can Help Detect
This test can help identify the following chromosomal conditions:
- Turner syndrome (45,X) — where one X chromosome is missing or altered
- Klinefelter syndrome (47,XXY) — where males carry an extra X chromosome
- Triple X syndrome (47,XXX) — where females carry an extra X chromosome
- XYY syndrome (47,XYY) — where males carry an extra Y chromosome
- Other sex chromosome aneuploidies (abnormal chromosome numbers)
How to Prepare and What to Expect
No special preparation is needed for the FISH Aneuploidy Detection XY test procedure. The steps are straightforward and the blood draw itself takes only a few minutes.
Do You Need to Fast?
No, fasting is not required for this test. You may eat and drink normally before your appointment.
Practical Tips Before Your Test
Keep the following in mind before your appointment:
- Bring a detailed clinical history, including your symptoms, previous test results, and relevant medical records
- Inform the phlebotomist of any medications you are currently taking
- Wear a short-sleeved or loose-sleeved top to allow easy access to the arm for blood collection
- Stay well hydrated
- Arrive calm and rested; there is no need for any specific activity restrictions
Step-by-Step Procedure
Here is what to expect during the FISH Aneuploidy Detection XY test procedure:
- A trained phlebotomist cleans the skin on your inner arm with an antiseptic swab.
- A small needle is inserted into a vein, typically in the crook of the elbow, to draw approximately 3 ml of blood.
- The blood is collected into a green-capped sodium heparin tube to prevent clotting.
- The needle is removed, and a small bandage or cotton swab is placed over the puncture site.
- The sample is stored at 2 to 8 degrees Celsius and dispatched to the laboratory on the same day.
- In the laboratory, fluorescent probes are applied to the cells and a trained technologist counts the chromosome signals under a microscope. The report is ready within 3 days.
Factors That Can Affect Accuracy
The following factors may influence the reliability of results:
- Low levels of mosaicism (where only some cells carry the chromosome abnormality) may not be detected by FISH
- Poor sample quality or inadequate sample volume
- Delay or improper storage during specimen transport
- High levels of maternal cell contamination in prenatal samples
Understanding Your FISH Aneuploidy Detection XY Test Results
Your doctor will review your results alongside your clinical history and symptoms. The table below shows what a normal FISH result looks like for X and Y chromosomes.
| Parameter | Normal Finding (Female) | Normal Finding (Male) |
|---|---|---|
| Chromosome X signals | 2 signals per cell (XX) | 1 signal per cell (XY) |
| Chromosome Y signals | 0 signals per cell | 1 signal per cell (XY) |
An abnormal result may show extra or missing signals, suggesting a sex chromosome aneuploidy such as Turner syndrome, Klinefelter syndrome, Triple X syndrome, or XYY syndrome. When no abnormality is detected, the report will state that findings are within normal limits for the probes tested.
Disclaimer: This information serves as a general guide. Your doctor will evaluate your cytogenetic results alongside your clinical background, symptoms, and other diagnostic findings. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
The following conditions may affect how results are interpreted:
- Low-level mosaicism involving the X or Y chromosome may not be picked up by this test, as FISH targets specific chromosome regions only
- Normal FISH results do not exclude the majority of other chromosomally detectable abnormalities; follow-up tests such as karyotyping or chromosomal microarray may be needed
Understanding Your Chromosomal Health and Support
Chromosomal constitution is determined at conception and cannot be changed by lifestyle choices. However, the following steps are useful after receiving results:
- Seek genetic counselling to understand what your results mean and what options are available
- Follow up with a specialist such as a geneticist or endocrinologist as recommended by your doctor
- Keep all follow-up appointments, as early management of related conditions can support overall health and development
Lupin Diagnostics FISH Aneuploidy Detection XY Test Price and Home Collection
The FISH Aneuploidy Detection XY test cost at Lupin Diagnostics starts at ₹4,500, and home collection is available across major Indian cities. The sample is processed in NABL-accredited laboratories with results delivered digitally.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 4500 |
| CHENNAI | 4500 |
| HYDERABAD | 4500 |
| NAVI MUMBAI | 4500 |
| PUNE | 4500 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Follow these steps to book your FISH Aneuploidy Detection XY test online:
- Select the test on the Lupin Diagnostics website
- Choose your city and preferred time slot
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre
- Receive your report via email or WhatsApp within the stipulated turnaround time
Home Collection
The FISH Aneuploidy Detection XY test home collection service is available across cities. A certified phlebotomist visits your home at your chosen time to collect the peripheral blood sample. All samples are processed in NABL-accredited Lupin Diagnostics laboratories, and your report is accessible digitally once ready.
Frequently Asked Questions
This test detects abnormalities in the number of X and Y sex chromosomes in a person's cells. It helps identify conditions such as Turner syndrome, Klinefelter syndrome, Triple X syndrome, and XYY syndrome. Your doctor will request it when clinical signs suggest a chromosomal disorder.
For this test at Lupin Diagnostics, a peripheral blood sample is collected from a vein in the arm using a standard blood draw. The sample is collected into a green-capped sodium heparin tube and dispatched to the laboratory under refrigerated conditions.
No, fasting is not required. You can eat and drink normally before your appointment. There are no dietary restrictions specific to this test.
The report for the FISH Aneuploidy Detection XY test is typically ready within 3 days of sample collection. Your report will be delivered digitally via email or WhatsApp.
No, this test is designed specifically to detect abnormalities in the X and Y chromosomes only. It does not identify structural chromosomal changes or abnormalities in other chromosomes. Your doctor may recommend additional tests such as karyotyping or chromosomal microarray if a broader assessment is needed.
An abnormal result means the expected number of X or Y chromosomes was not found in the cells analysed. This does not by itself provide a final diagnosis. Your doctor will discuss the findings with you and may recommend genetic counselling or further confirmatory testing.
No, lifestyle choices and medications do not change the number of chromosomes in your cells. Chromosomal constitution is fixed at conception. However, do inform your doctor of any medications you are taking, as this context helps with overall clinical assessment.
FISH Aneuploidy Detection XY Test
