Vitamin B12, Active Holo Transcobalamin Test: Booking, Price, and Results
About Vitamin B12, Active Holo Transcobalamin Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | Active B12, HoloTC, Holotranscobalamin, Active Holo TC, TC-B12, Holotranscobalamin II |
| Sample Type | Venous blood (serum) |
| Fasting Required | Overnight fasting is recommended |
| Report Time | 1 to 3 working days |
| Recommended For | All genders and ages, especially vegetarians, vegans, elderly individuals, pregnant women, and those with gastrointestinal disorders |
| Price | Starting at ₹1,200 |
What Is a Vitamin B12, Active Holo Transcobalamin Test?
The Vitamin B12 Active Holo Transcobalamin Test measures the biologically usable fraction of vitamin B12 in your blood. Unlike a standard B12 test, which measures all forms of B12, this test isolates the portion that your cells can actually absorb and use. It is also known as Active B12, HoloTC, or Holotranscobalamin. A small blood sample drawn from a vein is used for this test, and overnight fasting is recommended.
What Does a Vitamin B12, Active Holo Transcobalamin Test Measure?
Only about 10 to 30% of the vitamin B12 circulating in your blood is bound to a protein called transcobalamin. This bound form, known as Holotranscobalamin (Active B12) or Active Holo TC, is the only fraction that body cells can take up through specific receptors. The remaining B12 in your blood is inactive and cannot be used by cells.
The table below summarises what the test measures:
| Parameter | What It Represents |
|---|---|
| Holotranscobalamin (HoloTC) | The biologically active, cell-available fraction of circulating vitamin B12 |
Because HoloTC is the first marker to drop when your body starts running low on B12, this test can detect a deficiency earlier than the standard total B12 test.
Why Is a Vitamin B12, Active Holo Transcobalamin Test Done?
Doctors order this test when they want to assess whether the body has enough functional B12, especially in people who may be at risk of deficiency or whose symptoms do not match their standard B12 results.
Common Symptoms That May Require This Test
The following symptoms may prompt a doctor to recommend an Active B12 test:
- Persistent tiredness and fatigue
- Pale or yellowish skin
- Pins and needles (paraesthesia) or numbness in hands and feet
- Dizziness or breathlessness
- Muscle weakness
- Memory problems or difficulty concentrating
- Mood changes or low mood
- Heart palpitations
Conditions This Test Can Help Detect
This test can assist in identifying several conditions, including:
- Vitamin B12 deficiency
- Pernicious anaemia (an autoimmune condition that prevents B12 absorption)
- Transcobalamin deficiency
- Atrophic gastritis (inflammation of the stomach lining)
- Ileal disease (conditions affecting the lower small intestine)
- Helicobacter pylori infection
- Chronic malnutrition or dietary deficiency, particularly in vegetarian and vegan diets without supplementation
Vitamin B12, Active Holo Transcobalamin Test During Pregnancy
Unlike total vitamin B12, which naturally declines during pregnancy, Holotranscobalamin levels remain stable throughout, making it a more reliable indicator of B12 status in expectant mothers. NICE guidelines recommend using active B12 as the first test for suspected B12 deficiency during pregnancy. Low maternal B12 during pregnancy is a recognised risk factor for neural tube defects and other neurological problems in the infant.
Vitamin B12, Active Holo Transcobalamin Test for Chronic Disease Monitoring
For people with ongoing conditions that affect B12 absorption, such as pernicious anaemia, coeliac disease, or those who have had gastric surgery, periodic Active Holo TC testing helps track whether supplementation is maintaining adequate B12 levels. The treating doctor determines how often the test should be repeated based on the underlying condition and treatment response.
How to Prepare and What to Expect
This test requires very little preparation. Here is what you need to know before your appointment.
Do You Need to Fast?
Yes, overnight fasting is required for this test. Certain types of medication and pregnancy can affect the test results. It is advised to consult your health care professional on whether or not a medicine needs to be stopped before the test.
Practical Tips Before Your Test
Keep the following points in mind before your sample is collected:
- Inform your doctor if you are taking vitamin B12 supplements in any form (tablets, injections, or patches)
- Mention all current medications, especially metformin, proton pump inhibitors, or oral contraceptives
- If your doctor advises it, avoid B12 supplements for two weeks before the test
- Drink plenty of water on the day of your test to stay well hydrated
Step-by-Step Procedure
Here is what happens during a standard blood sample collection:
- A trained phlebotomist (blood collection specialist) will ask you to sit comfortably and extend your arm.
- An elastic band is placed around your upper arm to make the veins easier to locate.
- You may be asked to make a fist to help fill the veins with blood.
- The skin over the selected vein is wiped with an antiseptic solution.
- A thin needle is gently inserted to draw a small amount of blood into a collection tube.
- The needle is removed, gentle pressure is applied to the site, and your sample is labelled and sent to the laboratory.
Factors That Can Affect Accuracy
Certain factors may influence your test result, including:
- Recent B12 supplementation or B12 injections
- Use of oral contraceptives, proton pump inhibitors, or metformin
- Kidney or liver disease
- Dehydration at the time of the blood draw
- Ongoing B12 treatment
Understanding Your Vitamin B12, Active Holo Transcobalamin Test Results
Your results should always be reviewed by your doctor alongside your symptoms and overall health history. The table below shows the general interpretation ranges used for HoloTC:
| HoloTC Level | Interpretation |
|---|---|
| Above 165 pmol/L | Deficiency unlikely; adequate functional B12 |
| 25 to 165 pmol/L | Indeterminate zone; further testing may be needed |
| Below 25 pmol/L | Deficiency likely |
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 health conditions can influence Active Holo TC levels:
- Kidney (renal) disorders may cause higher HoloTC concentrations due to changes in how the kidneys filter transcobalamin.
- Liver disease and certain conditions involving immune activation may also elevate HoloTC levels.
- During pregnancy, Holotranscobalamin stays stable even as total B12 falls, making it a dependable marker in this group.
- Oral contraceptives can lower total B12 but do not significantly affect HoloTC readings.
How to Maintain Healthy Levels
The following general habits support good B12 status:
- Include B12-rich foods in your regular diet, such as meat, fish, eggs, dairy products, and fortified cereals or plant milks.
- If you follow a vegetarian or vegan diet, speak to your doctor about whether a B12 supplement is appropriate for you.
- If you have a gastrointestinal condition that affects nutrient absorption, work with your doctor to manage it and monitor your B12 levels periodically.
Lupin Diagnostics Vitamin B12, Active Holo Transcobalamin Test Price and Home Collection
The Vitamin B12 Active Holo Transcobalamin Test at Lupin Diagnostics starts at approximately ₹1,200, and home sample collection is available across major cities.
| City | Approximate Price (₹) |
|---|---|
| Bhubaneshwar | ₹1,200 |
| Mumbai | ₹1,200 |
| Bengaluru | ₹1,200 |
| Kolkata | ₹1,200 |
| Chennai | ₹1,200 |
| Hyderabad | ₹1,200 |
| Pune | ₹1,200 |
| Nagpur | ₹1,200 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- 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 blood collection for the Active B12 test across multiple cities, carried out by trained and certified phlebotomists. All samples are processed in NABL-accredited laboratories to ensure accuracy and quality. Once your report is ready, you can access it digitally via email or WhatsApp.
Frequently Asked Questions
A standard vitamin B12 blood test measures all forms of B12 in the blood, including those the body cannot use. The Active B12 (HoloTC) test measures only the fraction bound to transcobalamin, which is the form cells can actually absorb. This makes it a more precise indicator of true B12 status and can detect a shortfall earlier than the standard test.
Total vitamin B12 levels naturally fall during pregnancy due to physiological changes, which can make standard results difficult to interpret. Holotranscobalamin levels remain stable throughout pregnancy, so they provide a more dependable reading of actual B12 availability for both mother and baby.
Yes, overnight fasting is recommended before this test.
This test is particularly useful for vegetarians, vegans, older adults, pregnant women, and people with digestive conditions that affect nutrient absorption. It is also worth considering when a standard B12 result is borderline or does not fit the clinical picture.
Yes. Vitamin B12 supplements, proton pump inhibitors, metformin, and oral contraceptives can all influence results. Always inform your doctor about any medications or supplements you are taking before the test.
The right frequency depends on your health, risk factors, and whether you are being treated for a deficiency. Your doctor will advise on timing. People receiving B12 supplementation for a diagnosed condition may need periodic Active Holo TC testing to check that treatment is working.
A low result should be discussed with your doctor, who will consider your symptoms, diet, and medical history before deciding on the next steps. Do not start or change supplementation without medical guidance.
Vitamin B12, Active Holo Transcobalamin Test: Booking, Price, and Results
