Biotinidase Quantitative Test
About Biotinidase Quantitative Test
| Field | Value |
|---|---|
| Also Known As | Biotinidase Activity Test, Biotinidase Enzyme Activity, Biotinidase Deficiency Test, BTD Test, Serum Biotinidase |
| Sample Type | Serum |
| Fasting Required | No fasting required |
| Report Time | 3 Days |
| Recommended For | All ages; primarily newborns, infants, and children with suspected metabolic disorders |
| Price | Starting at ₹5,000 |
What Is a Biotinidase Quantitative Test?
The Biotinidase Quantitative test measures the activity of an enzyme called biotinidase in a blood sample. Biotinidase is responsible for recycling biotin, a B vitamin that the body needs for several key chemical processes. Also called the Biotinidase Deficiency Test or Biotinidase Activity Test, this test is widely regarded as the gold standard for confirming biotinidase deficiency, a rare inherited condition. A small serum sample, drawn from a vein, is used for the analysis.
What Does a Biotinidase Quantitative Test Measure?
This test measures how active the biotinidase enzyme is in the blood. The enzyme releases biotin from biocytin (a metabolic by-product) so the body can reuse it. Biotin, in turn, supports four important carboxylase enzymes involved in breaking down amino acids, building fatty acids, and producing glucose from non-sugar sources.
The result is expressed as a percentage of normal adult enzyme activity. Here is a summary of the activity levels and their meanings:
| Parameter | Range | Interpretation |
|---|---|---|
| Normal Activity | Greater than 30% of mean normal adult activity | Biotinidase function is adequate |
| Partial Deficiency | 10% to 30% of mean normal adult activity | Reduced enzyme function |
| Profound Deficiency | Less than 10% of mean normal adult activity | Severely reduced enzyme function |
Note: Full-term newborns naturally have 50% to 70% of mean normal adult activity, so age-specific reference ranges apply to this group.
Why Is a Biotinidase Quantitative Test Done?
Doctors order this test when they suspect a problem with biotin metabolism, especially in newborns who have had an abnormal result on routine newborn screening.
Common Symptoms That May Require This Test
The following symptoms may prompt a doctor to request a Biotinidase Quantitative Test:
- Recurrent seizures that do not respond to standard treatment
- Hypotonia (unusually weak muscle tone)
- Unexplained vision loss or eye problems
- Sensorineural hearing loss (nerve-related hearing difficulty)
- Persistent skin rash or hair loss (alopecia)
- Failure to thrive or poor weight gain in infants
- Excess acid in the body (metabolic acidosis)
Conditions This Test Can Help Detect
This test can help identify several conditions. These include:
- Profound biotinidase deficiency (enzyme activity below 10% of normal)
- Partial biotinidase deficiency (enzyme activity between 10% and 30% of normal)
- Certain organic acidurias (conditions where abnormal organic acids accumulate in the urine)
- Holocarboxylase synthetase deficiency, another disorder affecting biotin metabolism
Biotinidase Quantitative Test for Chronic Disease Monitoring
Individuals confirmed to have profound or partial biotinidase deficiency require lifelong biotin supplementation. This test can be repeated to verify treatment response and ensure the body is maintaining adequate enzyme function. Infants diagnosed with partial deficiency through newborn screening are typically retested at three to six months of age to confirm results.
How to Prepare and What to Expect
No special preparation is needed for the biotinidase quantitative test procedure. The steps below explain what to expect from start to finish.
Do You Need to Fast?
No, fasting is not required before this test. You can eat and drink normally beforehand. If additional tests are ordered at the same time, check with your doctor whether any of those require fasting.
Practical Tips Before Your Test
Keep the following points in mind before your appointment:
- Bring a detailed clinical history, including symptoms, previous test results, and relevant family history, as this is required for the test.
- Inform the phlebotomist or doctor if the patient (or child) is taking sulfonamide antibiotics, as these can interfere with the test result.
- Disclose any biotin supplements being taken, since high biotin intake may affect enzyme activity readings.
- Wear a loose-sleeved top for easy access during blood collection.
- Stay well hydrated to help with the blood draw.
Step-by-Step Procedure
Here is what happens during sample collection:
- A trained phlebotomist cleans the skin over a vein, usually on the inner arm.
- A small amount of blood (approximately 3 ml) is drawn using a fine needle into a gel tube.
- The needle is removed, and light pressure is applied to the collection site.
- The blood sample is centrifuged (spun) promptly to separate the serum from the cells.
- The serum is transferred into a labelled vial and stored under refrigeration for safe transport.
- The sample is sent to the laboratory, where enzyme activity is measured using spectrophotometry.
Factors That Can Affect Accuracy
Several factors may influence the test result:
- Use of sulfa (sulfonamide) drugs, which can interfere with enzyme activity measurement
- Recent blood transfusion, which may affect serum enzyme readings
- Premature birth, as preterm babies may have naturally lower enzyme activity
- Delayed sample processing or exposure to heat and humidity, which can cause false-positive newborn screening results
- Haemolysis (breakdown of red blood cells in the sample) or other sample handling issues
Understanding Your Biotinidase Quantitative Test Results
Results from the Biotinidase Quantitative Test indicate how well the biotinidase enzyme is functioning. A qualified doctor will review your results alongside your clinical history and other relevant information.
| Activity Level | Result | Meaning |
|---|---|---|
| Greater than 30% of normal | Normal | Biotinidase deficiency unlikely |
| 10% to 30% of normal | Partial deficiency | Reduced but not absent enzyme function |
| Less than 10% of normal | Profound deficiency | Severely reduced enzyme function |
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 situations can affect how results are interpreted:
- Newborns naturally have lower biotinidase activity (50% to 70% of mean normal adult levels), so adult reference ranges do not apply directly to this group.
- Premature babies may show out-of-range values unrelated to true deficiency.
- Patients on sulfonamide antibiotics may have falsely altered results due to assay interference.
- A high biotin diet may produce a normal clinical picture even when the enzyme level is genuinely low.
- A recent blood transfusion may make the serum sample unsuitable for accurate testing.
How to Maintain Healthy Levels
The following general tips support overall metabolic health:
- Maintain a balanced diet that includes biotin-rich foods such as eggs, nuts, and leafy vegetables.
- If biotinidase deficiency is confirmed, follow your doctor's specific guidance on biotin supplementation.
- Children diagnosed early through newborn screening and treated promptly typically develop normally, so attending scheduled follow-up appointments is important.
Lupin Diagnostics Biotinidase Quantitative Test Price and Home Collection
The Biotinidase Quantitative test cost at Lupin Diagnostics starts at ₹5,000, and home sample collection is available across cities. The approximate prices by city are listed below.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 6200 |
| CHENNAI | 6200 |
| HYDERABAD | 6200 |
| KOLKATA | 5000 |
| NAVI MUMBAI | 5000 |
| PUNE | 6200 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
You can complete your Biotinidase Quantitative test online booking in a few simple steps:
- 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 Biotinidase Quantitative test home collection is available across multiple cities through Lupin Diagnostics. A certified phlebotomist visits your home at your chosen time to collect the sample. All samples are processed in NABL-accredited laboratories, and digital reports are accessible once ready.
Frequently Asked Questions
The Biotinidase Quantitative test measures how active the biotinidase enzyme is in the blood. It is the gold standard method for confirming biotinidase deficiency, a rare inherited condition that affects the body's ability to recycle biotin. It is most commonly ordered as a follow-up to an abnormal newborn screening result.
No fasting is needed before the Biotinidase Quantitative test. You and your child can eat and drink normally on the day of the test. However, do inform your doctor about any medications or supplements being taken, as some can affect the result.
Biotinidase deficiency is part of most newborn screening programmes. Identifying the condition before symptoms appear allows treatment to begin early. Newborns diagnosed and treated promptly with biotin generally develop normally, without the neurological or skin-related complications seen in untreated cases.
A doctor may order this test if a child shows seizures that do not respond to standard treatment, weak muscle tone, unexplained hair loss, persistent skin rash, or signs of developmental delay. These can all be features of untreated biotinidase deficiency.
Both are confirmed by the Biotinidase Deficiency Test, but differ in severity. Partial deficiency means enzyme activity is between 10% and 30% of normal. Profound deficiency means activity is below 10% of normal and typically causes more serious symptoms if untreated.
Infants found to have partial deficiency on newborn screening should have a repeat test at three to six months of age to confirm the result. Those on biotin treatment for confirmed deficiency may need periodic retesting to check that the treatment is working effectively.
Biotin supplementation is effective in preventing the clinical features of biotinidase deficiency when started early. In patients who already have symptoms, treatment can reverse many features, though some complications involving development, vision, and hearing may not fully resolve. Your doctor will advise on the appropriate management plan.
Biotinidase Quantitative Test: Booking, Price, and Results
