Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) Test
About Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) Test
| Field | Value |
|---|---|
| Also Known As | CYP2D6 Genetic Test, Cytochrome P450 2D6 Pharmacogenetic Test, CYP2D6 Allele Test, Debrisoquine 4-Hydroxylase Genotyping |
| Sample Type | Peripheral blood (EDTA tube) |
| Fasting Required | No fasting required |
| Report Time | 15 days |
| Recommended For | Adults and children of any gender before starting or during treatment with medications processed by the CYP2D6 enzyme |
| Price | Starting at ₹6,600 |
What Is a Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) Test?
The Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) test is a genetic test that examines specific variants in the CYP2D6 gene. This gene controls how your body breaks down a wide range of commonly prescribed medicines. Also called the CYP2D6 Genetic Test or Cytochrome P450 2D6 Pharmacogenetic Test, it is typically ordered before starting certain medicines to help predict how your body will respond to them. A small blood sample is collected from a vein in your arm.
What Does a Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) Test Measure?
This test looks at the genetic makeup of your CYP2D6 gene to predict how efficiently your body processes specific drugs. The following components are analysed:
| Component | What It Tells Us |
|---|---|
| CYP2D6 star alleles | Specific gene variants that determine how fast or slow you break down certain medicines |
| Copy number variation (CNV) | Whether you have extra, fewer, or no copies of the CYP2D6 gene, which affects enzyme output |
| Metaboliser phenotype | Your overall drug-processing category: poor, intermediate, normal, or ultrarapid metaboliser |
Why Is a Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) Test Done?
Doctors order this test to understand how a patient's body handles medicines metabolised by the CYP2D6 enzyme, helping to guide safer and more effective treatment decisions.
Common Symptoms That May Require This Test
The following situations or symptoms often prompt a doctor to request this test:
- Unexpected or severe side effects from a standard medicine dose
- Lack of response to medications even at normal doses
- Therapeutic failure with multiple drugs over time
- History of serious adverse drug reactions
- Family history of unusual reactions to medicines
- Planned use of pain medicines such as codeine or tramadol
Conditions This Test Can Help Detect
This test is used to guide treatment rather than diagnose disease. It is relevant in the following clinical situations:
- Pain management with opioids such as codeine, tramadol, or oxycodone
- Breast cancer patients being considered for tamoxifen therapy
- Psychiatric conditions requiring antidepressants or antipsychotics
- Treatment with beta-blockers, antiemetics, or atomoxetine
- Pre-emptive pharmacogenomic testing before starting any CYP2D6-metabolised drug
How to Prepare and What to Expect
The CYP2D6 Allele Test procedure is straightforward and requires minimal preparation. Here is what you should know before your appointment.
Do You Need to Fast?
No fasting is required for this blood test. You can eat and drink normally before your appointment.
Practical Tips Before Your Test
The following steps will help ensure a smooth sample collection:
- Bring a detailed clinical history, including your symptoms, previous test results, and family history, as this is required for the test.
- Carry a complete list of all medicines you are currently taking, as some drugs can affect how the results are interpreted.
- Wear a short-sleeved top or clothing with sleeves that roll up easily for a blood draw.
- Inform the phlebotomist of any known needle sensitivity or medical conditions.
- No special dietary restrictions are needed before the test.
Step-by-Step Procedure
The following steps describe what happens during the Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) test procedure:
- A trained phlebotomist cleans the skin over a vein in your arm using an antiseptic wipe.
- A small needle is inserted, and 2 mL of blood is drawn into a lavender-top EDTA tube.
- The needle is removed, and gentle pressure is applied to the site to stop any bleeding.
- The sample is labelled with your details and stored at 2 to 8 degrees Celsius for safe transport.
- The sample is sent to a specialised molecular genetics laboratory for DNA extraction and analysis using Sanger Sequencing.
- Your report is prepared and delivered within 15 days.
Factors That Can Affect Accuracy
The following factors may influence the reliability of your results:
- Poor sample quality due to improper collection or storage
- Concurrent use of strong CYP2D6-inhibiting medicines such as fluoxetine, paroxetine, or bupropion
- Incomplete allele panel coverage at the testing laboratory
- Delayed transport of the sample without proper refrigeration
Understanding Your Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) Test Results
This test does not produce conventional high-or-low numerical values. Instead, the detected combination of gene variants (called a diplotype) is used to assign an activity score, which then predicts your metaboliser phenotype. The table below shows how activity scores map to phenotype categories:
| Phenotype | Activity Score | Enzyme Activity |
|---|---|---|
| Ultrarapid Metaboliser (UM) | Greater than 2.25 | Increased activity |
| Normal Metaboliser (NM) | 1.25 to 2.25 | Normal activity |
| Intermediate Metaboliser (IM) | 0.25 to 1.25 | Decreased activity |
| Poor Metaboliser (PM) | 0 | No activity |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain medicines taken at the time of testing can alter the interpretation of your results. Strong inhibitors such as fluoxetine, paroxetine, quinidine, and bupropion can completely suppress CYP2D6 enzyme activity. Moderate inhibitors such as duloxetine, sertraline, and terbinafine can reduce activity by around 50%. This means a person who is genetically a normal metaboliser may behave like a poor metaboliser while taking these drugs. Always inform your doctor about all medicines you are taking so they can interpret your results in the correct context.
How to Maintain Healthy Levels
Since this is a genetic test, the result itself does not change. However, the following steps help you get the most from your results:
- Share your metaboliser status with every healthcare provider before starting a new medicine.
- Keep a written or digital record of your CYP2D6 result for all future medical consultations.
- Remember that the genotype result complements, but does not replace, ongoing clinical and therapeutic drug monitoring.
Lupin Diagnostics Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) Test Price and Home Collection
The Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) test cost at Lupin Diagnostics starts at ₹6,600, and home sample collection is available across cities.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 6600 |
| CHENNAI | 6600 |
| HYDERABAD | 6600 |
| KOLKATA | 6600 |
| NAVI MUMBAI | 6600 |
| PUNE | 6600 |
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 complete your Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) test online booking:
- 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
Lupin Diagnostics offers Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) test home collection across multiple cities, with samples collected by certified phlebotomists at a time convenient for you. All samples are processed in NABL-accredited laboratories to ensure accurate and reliable results. Digital reports are shared directly with you via email or WhatsApp once ready.
Frequently Asked Questions
This test analyses your DNA to determine how your body processes medicines controlled by the CYP2D6 enzyme. Doctors use the result to select the right medicine and dose for you, reducing the risk of side effects or treatment failure.
This test only needs to be done once in your lifetime. Your genetic makeup does not change, so the result remains valid permanently and can be used for all future treatment decisions.
The test involves a brief needle prick to draw a small blood sample from your arm. Most people find it mildly uncomfortable for just a few seconds. The area may feel slightly tender afterwards, but this passes quickly.
Anyone starting medicines such as codeine, tramadol, tamoxifen, certain antidepressants, or antipsychotics may benefit from this test. It is also relevant for people with a personal or family history of unusual or severe reactions to these types of medicines.
Yes. Some medicines, particularly certain antidepressants such as fluoxetine, paroxetine, and sertraline, can suppress CYP2D6 enzyme activity. Your doctor needs to know about all medicines you are taking to correctly interpret the result in relation to your actual drug-processing capacity.
Yes. Studies show that the distribution of CYP2D6 gene variants in the Indian population differs from global averages. The most common alleles found in Indians are CYP2D6*1, *2, and *41, which together account for a high proportion of normal metabolisers. Your doctor will interpret your specific result in context.
Cytochrome P450 2D6 Genotyping (CYP2D6 - Alleles) Test
