Vitamin B6 (Vit B6) Test
About Vitamin B6 (Vit B6) Test
| Field | Value |
|---|---|
| Also Known As | Pyridoxine test, Pyridoxal 5-Phosphate (PLP) test, Serum Vitamin B6 test |
| Sample Type | Venous blood (plasma) |
| Fasting Required | Yes – 8 to 12 hours overnight fast; avoid vitamin supplements for 24 hours before collection |
| Report Time | 3 to 6 business days |
| Recommended For | All adults; particularly those with neurological symptoms, malabsorption conditions, or those on certain medications |
| Price | Starting at ₹3,900 |
What Is a Vitamin B6 (Vit B6) Test?
The Vitamin B6 test measures the level of pyridoxal 5-phosphate (PLP), the active form of vitamin B6, in your blood plasma. Doctors order this test when they suspect a patient may have too little or too much vitamin B6 in their body. Also called the Pyridoxine test or Serum Vitamin B6 test, it uses a small blood sample drawn from a vein in your arm.
What Does a Vitamin B6 (Vit B6) Test Measure?
The Vitamin B6 blood test primarily measures one key marker. Below is what the test analyses and why it matters.
| Parameter | What It Tells Us |
|---|---|
| Pyridoxal 5-Phosphate (PLP) | The main active form of vitamin B6 in the body; used to assess your overall vitamin B6 status |
Vitamin B6 is involved in over 140 enzyme reactions in the body. These include the production of neurotransmitters (chemical messengers in the brain), breakdown of amino acids and sugars, fat metabolism, haemoglobin synthesis, and gene expression. The Pyridoxal 5-Phosphate (PLP) test directly reflects how much usable B6 your body has available.
Why Is a Vitamin B6 (Vit B6) Test Done?
A Vitamin B6 level test is ordered when a doctor needs to check whether your vitamin B6 levels are within a healthy range.
Common Symptoms That May Require This Test
Several symptoms may prompt a doctor to request this test. Here are the most common ones:
- Numbness or tingling in the hands and feet (peripheral neuropathy)
- Inflammation or soreness of the tongue (glossitis)
- Mouth sores or cracked lips
- Skin rashes, including oily or flaky patches
- Irritability, depression, or confusion
- Weakness or persistent fatigue
- Dizziness or seizures
Conditions This Test Can Help Detect
The Vitamin B6 blood test can help identify a range of conditions linked to abnormal B6 levels:
- Vitamin B6 deficiency causing anaemia (low healthy red blood cells)
- Peripheral neuropathy linked to low or excessively high B6 levels
- Burning mouth syndrome associated with B6 deficiency
- Seborrhoeic dermatitis (oily, flaky skin rash) caused by deficiency
- Hypophosphatasia, a rare inherited metabolic disorder where PLP levels are elevated
- Sideroblastic anaemia related to B6 deficiency
- Pyridoxine toxicity from excessive supplement intake
How to Prepare and What to Expect
Preparing correctly for your Vitamin B6 test helps ensure your results are accurate.
Do You Need to Fast?
Yes, fasting is required. You should not eat or drink anything except water for 8 to 12 hours before your test. You must also avoid taking multivitamins or any vitamin supplements for 24 hours before sample collection, as these can raise your plasma B6 levels and affect accuracy.
Practical Tips Before Your Test
A few simple steps will help your test go smoothly:
- Drink plain water to stay hydrated
- Stop all vitamin supplements at least 24 hours beforehand
- Inform your doctor about any medications you take, especially isoniazid, oral contraceptives, or antiepileptic drugs
- Avoid high-carbohydrate meals before fasting, as carbohydrate intake can lower PLP levels
- Wear clothing with easy access to your inner elbow for blood collection
Step-by-Step Procedure
Here is what happens during a Vitamin B6 blood test collection:
- A trained phlebotomist (blood collection specialist) cleans the inside of your elbow with an antiseptic
- A small needle is inserted into a vein to draw a blood sample into a collection tube containing a preservative
- The tube is gently mixed several times to ensure the blood and preservative combine properly
- The sample is transferred into a special dark-coloured tube to protect it from light, as vitamin B6 compounds break down when exposed to light
- Pressure is applied to the puncture site, and a small bandage is placed over it
- The sample is sent to the laboratory in temperature-controlled, light-protected packaging for analysis
Factors That Can Affect Accuracy
Certain factors can alter your results. These include:
- Recent vitamin supplement intake (can artificially raise levels)
- Eating before the test (non-fasting conditions can elevate readings)
- Alcohol consumption (lowers PLP levels)
- Smoking or use of oral contraceptives
- Systemic inflammation or infection (can lower PLP levels even when B6 intake is adequate)
- Certain medications, including isoniazid, penicillamine, and carbidopa
Understanding Your Vitamin B6 (Vit B6) Test Results
Your results should always be reviewed with your doctor, who will consider your symptoms, medical history, and other test findings together.
| Parameter | Normal Range | Low May Indicate | High May Indicate |
|---|---|---|---|
| Pyridoxic acid (PA) | 3 to 30 µg/L | Vitamin B6 deficiency, low intake, or malabsorption | High recent dietary intake or supplementation |
| Pyridoxal 5-phosphate (PLP) | 5 to 50 µg/L (adequate status: 30 nmol/L or above) | Deficiency, malabsorption, kidney disease, medication effect | Hypophosphatasia,excess supplement intake, toxicity |
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
Some health conditions can affect how results are interpreted. During pregnancy, PLP levels may appear lower than usual. This is often a normal physiological response involving hormonal changes and blood dilution, rather than a true deficiency.
In patients with systemic inflammation, low PLP levels may not reflect genuine vitamin B6 deficiency. Inflammation itself lowers plasma vitamin levels, so your doctor will assess your albumin and alkaline phosphatase levels alongside B6 results.
In people with chronic kidney disease, vitamin B6 metabolism is affected by reduced kidney function, and B6 readings require careful interpretation.
How to Maintain Healthy Levels
These general tips support healthy vitamin B6 levels:
- Eat a varied diet that includes meat, fish, nuts, beans, wholegrains, fruits, and vegetables, all of which are natural sources of vitamin B6
- Limit alcohol intake, as regular alcohol consumption depletes vitamin B6 in the body
- Avoid taking high-dose B6 supplements without medical guidance, as excess intake can cause nerve-related symptoms
Lupin Diagnostics Vitamin B6 (Vit B6) Test Price and Home Collection
The Vitamin B6 test price at Lupin Diagnostics starts at ₹3,900, with home sample collection available across major cities. City-wise approximate prices are listed below.
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹3,900 |
| Bangalore | ₹3,900 |
| Chennai | ₹3,900 |
| Hyderabad | ₹3,900 |
| Indore | ₹3,900 |
| Kolkata | ₹3,900 |
| Pune | ₹3,900 |
| Bhopal | ₹3,900 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Booking your Vitamin B6 test near me through Lupin Diagnostics is straightforward:
- 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 home collection for the Serum Vitamin B6 test across cities, so you can have your sample collected at a time that suits you. All samples are processed in NABL-accredited laboratories by qualified technologists. Your digital report is delivered securely via email or WhatsApp.
Frequently Asked Questions
The Vitamin B6 test measures PLP levels in your blood to assess whether your vitamin B6 status is adequate. It is used to detect deficiency, which can cause anaemia, nerve problems, and skin changes, as well as toxicity from taking too many supplements.
Yes, an overnight fast of 8 to 12 hours is required. You should also avoid vitamin supplements for 24 hours before sample collection, as they can artificially raise your results.
A Pyridoxine test is worth discussing with your doctor if you have symptoms such as numbness or tingling in your hands or feet, persistent mouth sores, unexplained skin rashes, depression, or confusion. Those with kidney disease, malabsorption conditions, alcohol dependence, or those taking isoniazid or oral contraceptives may also benefit from testing.
Yes. Taking very high doses of vitamin B6 supplements over time can lead to sensory neuropathy, which involves tingling and numbness in the limbs, and in severe cases may affect walking. Doses of 100 mg or less per day are generally considered safe.
Vitamin B6 compounds, particularly PLP, break down when exposed to light. To prevent this, the sample is transferred into a dark-coloured tube and transported under light-protected conditions, ensuring your results are accurate.
The report turnaround for the Vitamin B6 level test is typically 3 to 6 business days, depending on laboratory processing times.
Yes. Systemic inflammation can lower plasma PLP levels even when your actual vitamin B6 intake is sufficient. This means a low result does not always confirm a true deficiency. Your doctor will consider your full clinical picture, including markers of inflammation, before drawing any conclusions.
Vitamin B6 (Vit B6) Test
