5-Fluorouracil (5 FU) Test: Booking, Price, and Results
About 5-Fluorouracil (5 FU) Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | 5-FU test, 5-Fluorouracil TDM Test, 5-FU Therapeutic Drug Monitoring Test, Fluorouracil Level Test |
| Sample Type | Whole blood (EDTA tube) |
| Fasting Required | No fasting required |
| Report Time | 7 days |
| Recommended For | Adults of all genders; cancer patients receiving 5-FU chemotherapy |
| Price | Starting at ₹5,500 |
What is a 5-Fluorouracil (5 FU) Test?
The 5-fluorouracil (5 FU) test measures the level of the chemotherapy drug 5-FU in a patient's blood. It is used to check whether the drug is present at a safe and effective concentration during treatment. This test is prescribed by oncologists for patients undergoing 5-FU chemotherapy. It is also known as the 5-FU test, 5-fluorouracil TDM test, 5-FU therapeutic drug monitoring test, or fluorouracil level test. A small sample of whole blood, collected into an EDTA tube, is all that is needed.
What Does a 5-Fluorouracil (5 FU) Test Measure?
This test measures a single parameter in the blood plasma. The following table summarises what is measured:
| Parameter | What It Tells Us |
|---|---|
| 5-FU AUC (Area Under the Curve) | Total drug exposure during the infusion cycle, used to guide dose adjustments |
The AUC value is compared against a target therapeutic range to determine whether the dose needs to be increased, reduced, or maintained for the next cycle.
Why is a 5-Fluorouracil (5 FU) Test Done?
This test is ordered for cancer patients receiving 5-FU chemotherapy to make sure the drug is working effectively without causing harm. Below are the main reasons a doctor may request this test.
Common Symptoms That May Require This Test
The following symptoms during 5-FU chemotherapy may prompt a doctor to request this test:
- Severe or prolonged nausea and vomiting
- Persistent diarrhoea that does not settle
- Painful mouth sores (mucositis)
- Unusual or extreme fatigue
- Low blood counts during treatment
- Severe skin reactions such as hand-foot syndrome
- Neurological symptoms during infusion
Conditions This Test Can Help Detect
This test is used in the management and monitoring of several situations, including:
- Dose optimisation in patients receiving 5-FU as part of treatment for colorectal cancer, where it is a key part of standard chemotherapy regimens
- Monitoring treatment in cancers of the breast, stomach, pancreas, oesophagus, liver, head and neck, anal canal, and bladder
- Identifying patients who are under-dosed and may have reduced treatment benefit
- Identifying patients who are over-dosed and at risk of serious side effects
- Detecting DPD (dihydropyrimidine dehydrogenase) deficiency, an enzyme condition that affects the body's ability to clear 5-FU safely
5-Fluorouracil (5 FU) Test for Chronic Disease Monitoring
The International Association of Therapeutic Drug Monitoring and Clinical Toxicology (IATDMCT) strongly recommends 5-FU drug monitoring for patients with colorectal or head-and-neck cancer on common 5-FU regimens. Monitoring is recommended across all treatment cycles, with dose adjustments made to keep the AUC within the target range of 20 to 30 mg·h/L. This ongoing monitoring helps personalise treatment and reduce the risk of toxicity over time.
How to Prepare and What to Expect
The 5 FU test procedure is straightforward, but timing and sample handling are critical for accurate results. Here is what you need to know before your test.
Do You Need to Fast?
No fasting is required for this test. You may eat and drink normally before sample collection. However, the timing of collection relative to your infusion is what matters most for an accurate result. Always follow specific instructions provided by your doctor.
Practical Tips Before Your Test
A few steps before the test will help ensure an accurate result:
- Bring a detailed clinical history including your symptoms, previous test results, and family history, as this is required for the test
- Inform your healthcare team of your infusion schedule and the exact timing of your last infusion
- Blood should ideally be collected at least 16 hours after starting your 5-FU infusion, to ensure the drug has reached steady-state levels
- Mention all medications you are currently taking to your oncologist, as some drugs may interact with 5-FU metabolism
- Wear clothing that gives easy access to the inner elbow area for blood collection
- Avoid strenuous physical activity just before the sample is taken
Step-by-Step Procedure
The following steps describe what happens during sample collection:
- A trained phlebotomist identifies the collection site, usually the inner elbow or the back of the hand, and prepares the area.
- The skin is cleaned thoroughly with an antiseptic wipe to reduce any risk of contamination.
- A tourniquet (a soft band) is tied above the collection site to make the veins more visible and easier to access.
- A sterile needle is gently inserted into a vein, typically at the cubital (inner elbow) area, and approximately 2 ml of whole blood is drawn into an EDTA (lavender-top) tube.
- The tourniquet is released, the needle is carefully withdrawn, and gentle pressure is applied to the site using cotton wool or gauze to stop any minor bleeding.
- The sample is then labelled, stored at refrigeration temperature (2 to 8°C), and dispatched to the laboratory.
Factors That Can Affect Accuracy
Several factors can influence the reliability of your result:
- Timing of sample collection relative to the start of the infusion
- Improper sample handling or failure to maintain cold-chain conditions
- Circadian (time-of-day) variation in how the body clears 5-FU
- Genetic differences in 5-FU metabolism, particularly DPD enzyme activity
- Liver function, as the liver is the primary site of 5-FU breakdown
Understanding Your 5-Fluorouracil (5 FU) Test Results
Your results should always be reviewed alongside your oncologist, who will consider your overall treatment plan, health history, and any side effects you may be experiencing. The table below shows the standard reference range:
| Parameter | Therapeutic Range | Unit |
|---|---|---|
| 5-FU AUC | 20 to 30 | mg·h/L |
Disclaimer: 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 conditions can meaningfully affect how your results are interpreted:
- DPD deficiency reduces the body's ability to break down 5-FU. Normally, DPD degrades up to 80 to 90% of an administered dose, and the drug's half-life is around 10 to 15 minutes. In patients with DPD deficiency, this half-life can be significantly prolonged, leading to toxic drug accumulation.
- Liver function also plays a role, as 5-FU is primarily metabolised in the liver. Patients with liver impairment may clear the drug more slowly, affecting their AUC readings.
- Gender is another factor to consider. DPD activity is approximately 15% lower in women than in men, which can influence how the drug behaves at a given dose.
How to Maintain Healthy Levels
The following general tips can support your wellbeing during 5-FU treatment:
- Attend all scheduled blood monitoring appointments throughout your chemotherapy cycles
- Report any new or worsening symptoms (such as severe nausea, mouth sores, or numbness) to your oncologist without delay
- Stay well-hydrated and maintain adequate nutrition to support your body during treatment
Lupin Diagnostics 5-Fluorouracil (5 FU) Test Price and Home Collection
The 5 FU test cost at Lupin Diagnostics starts at ₹5,500, and home sample collection is available for this test. The approximate prices across major Indian cities are listed below:
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 5500 |
| CHENNAI | 5500 |
| HYDERABAD | 5500 |
| KOLKATA | 5500 |
| NAVI MUMBAI | 5500 |
| PUNE | 5500 |
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 for 5 FU 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
The 5 FU test home collection is available across cities, so you can have your sample collected at a convenient time during your treatment cycle. All samples are processed in NABL-accredited Lupin Diagnostics laboratories. Your digital report will be shared with you securely once ready.
Frequently Asked Questions
The 5-Fluorouracil (5 FU) test measures the level of this chemotherapy drug in your blood during treatment. It helps confirm that you are receiving a dose that is effective against cancer without crossing into a range that could cause serious side effects. Your oncologist uses the result to adjust your dose for subsequent cycles.
This test is for cancer patients receiving 5-FU chemotherapy. It is particularly important for patients being treated for colorectal, head and neck, gastric, breast, and other solid tumour cancers. Your oncologist will advise when monitoring is needed based on your treatment regimen.
Blood should ideally be collected at least 16 hours after starting your 5-FU infusion. This timing ensures the drug has reached steady-state levels in your blood and reduces the influence of circadian variation in drug clearance. Your oncology team will advise on the exact timing for your situation.
DPD (dihydropyrimidine dehydrogenase) is the main enzyme that breaks down 5-FU in the body. Patients with a partial or complete deficiency of this enzyme cannot clear the drug efficiently, which can lead to a build-up of toxic drug levels. Testing and monitoring can identify patients at higher risk of this problem before serious harm occurs.
Monitoring is typically done during each treatment cycle, with a blood sample drawn towards the end of the infusion. Your oncologist will use the results to adjust your dose each cycle, aiming to keep your AUC within the recommended therapeutic range throughout your treatment course.
Yes, 5 FU test home collection is available through Lupin Diagnostics. Because the sample requires careful handling and refrigeration, the phlebotomist will follow specific cold-chain protocols during collection and transport to ensure accuracy.
If your AUC is above the target range, your oncologist may reduce your dose for the next cycle to lower the risk of toxicity. If it is below the range, a dose increase may be considered to improve treatment effectiveness. Personalised dose adjustments based on drug monitoring have been shown to reduce toxicity and improve treatment outcomes.
5-Fluorouracil (5 FU) Test: Booking, Price, and Results
