Serum Vitamin B12 Test in Delhi
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Know More About the Serum Vitamin B12 Test
The Serum Vitamin B12 test measures the concentration of cobalamin — vitamin B12 — in the blood, expressed in picograms per millilitre (pg/mL). It is the primary screening test for vitamin B12 deficiency and is used to investigate megaloblastic anaemia, unexplained neurological symptoms, and elevated homocysteine.
Vitamin B12 is a water-soluble vitamin that the body cannot synthesise and must obtain entirely from dietary sources — primarily meat, fish, eggs, and dairy products. It is absorbed in the terminal ileum via a highly specific mechanism that requires intrinsic factor, a glycoprotein secreted by the stomach's parietal cells. Deficiency therefore arises through two distinct pathways: inadequate dietary intake (common in strict vegetarians and vegans) or impaired absorption (due to pernicious anaemia, gastric atrophy, post-bariatric surgery, or medications such as metformin and proton pump inhibitors used long-term).
Reference ranges: Normal serum B12 is generally considered 200–900 pg/mL. Levels below 200 pg/mL indicate deficiency. Levels in the 200–300 pg/mL range are considered low-normal and clinically suspicious — individuals with these levels and compatible symptoms or risk factors may require further evaluation including plasma homocysteine and methylmalonic acid, which are more sensitive markers of functional B12 deficiency.
Clinical consequences of deficiency: Vitamin B12 deficiency causes two major categories of disease. First, megaloblastic macrocytic anaemia — where B12-deficient red blood cell precursors fail to divide normally, producing abnormally large, poorly functional red cells. This presents as fatigue, pallor, dyspnoea, and glossitis. Second, subacute combined degeneration of the spinal cord — a demyelinating neurological condition affecting the posterior and lateral columns of the spinal cord, causing progressive tingling and numbness (especially in the hands and feet), balance problems, and, in advanced cases, cognitive decline or psychiatric symptoms. Neurological damage from B12 deficiency can be irreversible if untreated for too long.
B12 is also essential for DNA synthesis and homocysteine metabolism. Deficiency causes hyperhomocysteinemia, which is an independent cardiovascular risk factor.
No fasting is required. Avoid B12 supplements for 24–48 hours before the test to prevent artificial elevation of the serum reading. The test is best interpreted alongside folate, CBC, and peripheral blood smear when investigating anaemia, and alongside homocysteine and methylmalonic acid when neurological symptoms are present.
Delhi's largely vegetarian urban population — across South Delhi, Dwarka, Rohini, East Delhi and the central districts — faces an extremely high burden of vitamin B12 deficiency, often silent until neurological or haematological symptoms emerge. Book from ₹500 and compare NABL-accredited labs on HealthVas.
Who Should Get a Serum Vitamin B12 Test
- Vegetarians, Vegans, and People with Low Animal Protein Intake – Vitamin B12 is found almost exclusively in animal-derived foods. Strict vegetarians and vegans have no dietary source unless they consume fortified foods or supplements. B12 deficiency is extremely common in this group and can develop silently over years as body stores are depleted.
- People with Tingling, Numbness, or Balance Problems – Peripheral neuropathy — tingling and numbness in the hands and feet — and balance disturbances are among the earliest neurological signs of B12 deficiency. Anyone with these unexplained symptoms should have B12 levels checked promptly, as neurological damage can be irreversible if the deficiency is prolonged.
- Individuals on Metformin for Diabetes – Metformin, the most widely prescribed oral antidiabetic drug, reduces vitamin B12 absorption in the ileum when taken long-term. People who have been on metformin for two or more years should have B12 levels checked annually as part of their diabetes monitoring.
- Elderly Individuals with Reduced Gastric Acid Production – The absorption of food-bound B12 requires adequate gastric acid and intrinsic factor. Elderly adults commonly develop gastric atrophy with reduced acid secretion, which impairs B12 absorption even when dietary intake is adequate. Annual B12 testing is advisable for people over 60.
- People Diagnosed with Macrocytic or Megaloblastic Anaemia – Elevated mean corpuscular volume (MCV) on a CBC — indicating large red blood cells — is the classic haematological sign of B12 deficiency. Anyone with macrocytic anaemia should have B12 and folate levels checked as part of the diagnostic workup.
- Delhi Residents with Predominantly Vegetarian Diets and Neurological Symptoms – Delhi's largely vegetarian population — across South Delhi, Dwarka, Rohini, East Delhi and the central districts — is at high risk for B12 deficiency. Tingling, fatigue, or memory changes in a person with no or minimal animal product intake warrant immediate B12 testing, as early treatment prevents irreversible neurological damage.
How to Prepare
No fasting is required for the Serum Vitamin B12 test. Avoid vitamin B12 supplements for 24–48 hours before the sample is collected — recent supplementation can artificially elevate the serum level and mask a true deficiency. Other medications, including metformin and proton pump inhibitors, should be continued as prescribed. If the test is being done to monitor response to B12 injections or high-dose oral supplements, wait at least a week after the last dose to allow a more representative steady-state level.
HealthVas partner labs offer free home sample collection across Delhi-NCR — a trained phlebotomist visits your home or office at a time slot you choose, so there is no travel and no waiting room. Reports are delivered digitally and a branded copy can be shared directly on WhatsApp.
Why Compare Lab Prices on HealthVas?
Multiple NABL-accredited partner labs offer the Serum Vitamin B12 test on HealthVas, and the price for the exact same test can differ widely from one lab to the next. Delhi has the densest concentration of NABL-accredited labs in NCR — and the price spread is widest here, meaning the difference between the most expensive and cheapest accredited option can be substantial.
NABL accreditation is the baseline standard for diagnostic accuracy in India — it certifies that a lab's equipment, reagents and reporting meet national quality benchmarks. Many partner labs additionally hold NABH, ISO or CAP certification, which add stricter internal quality controls. HealthVas shows you the accreditation alongside the price for each lab so you are comparing like with like, not just chasing the lowest number.
Unlike single-lab booking sites that only ever show you their own rate, HealthVas puts the accredited options side by side on one page. You see the lowest available price, the report turnaround, and whether free home collection is included — then book the lab that fits your budget and timeline.
Serum Vitamin B12 Test — What to Know Before Booking
The Serum Vitamin B12 test measures total cobalamin (pg/mL) in the blood. Normal range: 200–900 pg/mL. Levels below 200 pg/mL indicate deficiency; levels between 200–300 pg/mL are low-normal and may require further assessment with methylmalonic acid or homocysteine.
When investigating megaloblastic anaemia: order alongside folate, CBC, and peripheral blood smear. When investigating neurological symptoms: order alongside homocysteine and methylmalonic acid. Avoid B12 supplements for 24–48 hours before sampling.
Compare Serum Vitamin B12 test prices from NABL-accredited partner labs on HealthVas and book with free home sample collection across Delhi-NCR.
Frequently Asked Questions
Common questions for this test.
What does the Serum Vitamin B12 test measure?
The test measures the concentration of vitamin B12 (cobalamin) in the blood, expressed in picograms per millilitre (pg/mL). It is used to diagnose B12 deficiency, investigate megaloblastic anaemia, and evaluate unexplained neurological symptoms such as tingling, numbness, and balance problems.
What is the normal range for Vitamin B12?
Normal serum B12 is generally 200–900 pg/mL. Levels below 200 pg/mL indicate deficiency. Levels between 200–300 pg/mL are low-normal and clinically suspicious — functional deficiency may be present even when the number is technically within range. Plasma methylmalonic acid and homocysteine are more sensitive markers when the serum level is borderline.
Do I need to fast for the Vitamin B12 test?
No fasting is required. However, avoid vitamin B12 supplements for 24–48 hours before the test — recent supplementation can artificially elevate the serum level and mask a true deficiency.
What is the price of the Serum Vitamin B12 test?
It starts at ₹500 on HealthVas, with the lowest current rate from Dr khanna Pathcare. Prices vary across NABL-accredited partner labs — the live price for each is shown on the page.
Is home sample collection available for the Vitamin B12 test?
Yes. HealthVas partner labs offer free home sample collection across Delhi-NCR. A trained phlebotomist visits your home or office at the time slot you choose — no travel, no waiting room.
How long do Vitamin B12 test reports take?
Most partner labs deliver results within 24 hours of sample collection. The exact turnaround time for each lab is shown alongside the price on the HealthVas listing page.
Who is most at risk for vitamin B12 deficiency?
The highest-risk groups are: strict vegetarians and vegans (no dietary source); elderly individuals (reduced gastric acid and intrinsic factor production); people on long-term metformin for diabetes; people on long-term proton pump inhibitors; individuals who have had gastric bypass surgery; and anyone with a history of pernicious anaemia or autoimmune gastritis.
What are the signs and symptoms of vitamin B12 deficiency?
Symptoms fall into two main categories. Haematological: fatigue, pallor, shortness of breath, and rapid heartbeat from megaloblastic anaemia. Neurological: tingling and numbness (especially in hands and feet), balance difficulty, cognitive impairment, and, in severe or prolonged cases, memory problems or mood disturbance. Importantly, neurological damage can occur even before anaemia is detectable, and can be irreversible if treatment is delayed.
Can metformin cause vitamin B12 deficiency?
Yes. Metformin reduces vitamin B12 absorption in the terminal ileum when taken long-term. Deficiency develops gradually over years and is often asymptomatic until neurological symptoms emerge. People on metformin for two or more years should have annual B12 monitoring as part of their diabetes management.
Why should I compare Vitamin B12 test prices across labs?
The same NABL-accredited Serum Vitamin B12 test can be priced very differently across labs in the same city. Comparing on HealthVas ensures you pay the lowest accredited rate without any compromise in accuracy.
Do I need a prescription to book the Vitamin B12 test?
No. The Serum Vitamin B12 test does not require a prescription on HealthVas. You can book it directly for preventive screening, risk-factor evaluation, or symptom investigation.
Are the labs on HealthVas NABL-accredited?
Yes. Every partner lab listed on HealthVas is NABL-accredited. NABL certification verifies that the lab's equipment, reagents, methods, and quality systems meet national standards for diagnostic accuracy.
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