Vitamin B12 Active Venous Blood Test City of London
Vitamin B12 (Active) (Venous) to check nutritional status and identify potential deficiencies.
Book your test at our City of London clinic.
City of London Clinic
Vitamin B12 (Active) (Venous)
Test fee £81 + £50 phlebotomy fee (per visit)
- Results in 1 day"
- UKAS accredited laboratory
- Professional phlebotomy service
- Confidential results portal
Or call 020 7183 3709
Pay at clinic on the day of your appointment
About the Vitamin B12 (Active) (Venous)
The Vitamin B12 (Active) (Venous) is an individual blood test available at St Paul's Medical and Dental, our private practice at 5 Ave Maria Lane in the City of London, EC4M 7AQ. Your venous blood is taken by a registered nurse in an appointment of approximately 20 minutes. You can expect your results within 1 day", delivered securely to your email.
Vitamin B12 (cobalamin) is a water-soluble vitamin that is essential for the formation of red blood cells, neurological function, and DNA synthesis. It is primarily obtained from animal-derived foods including meat, fish, dairy, and eggs. The body stores vitamin B12 in the liver, and deficiency may take years to develop. When levels fall below the normal range, it can lead to megaloblastic anaemia and neurological changes. Individuals following a vegan or vegetarian diet, those over 50, and people with gastrointestinal conditions that affect absorption may be at higher risk of deficiency. A blood test measures the circulating level of B12 in the bloodstream.
St Paul's Medical and Dental is within walking distance of St Paul's tube station, Blackfriars, and City Thameslink. The clinic is open Monday to Friday from 8am to 8pm, making it convenient for City workers and local residents. All blood samples are processed by an accredited laboratory, and appointments can be booked online at a time that suits your schedule.
Who May Consider This Test
The Vitamin B12 (Active) (Venous) at our City of London clinic may be suitable for a variety of individuals. Below are some of the common reasons patients book this test:
- Individuals following a vegan or vegetarian diet
- People over 50, as absorption can decrease with age
- Those experiencing persistent fatigue or low energy
- Individuals with gastrointestinal conditions affecting absorption
- People taking long-term proton pump inhibitors (PPIs) or metformin
- Anyone experiencing tingling, numbness, or cognitive changes
How to Prepare
Stay well hydrated
Drink plenty of water before your appointment. Good hydration helps make veins easier to locate and can make the blood draw quicker and more comfortable.
Continue your regular medications
Unless specifically advised otherwise by your doctor, continue taking your prescribed medications as normal before the test.
Attend your appointment
Arrive at St Paul's Medical and Dental, 5 Ave Maria Lane, EC4M 7AQ with your booking confirmation. The nearest stations are St Paul's, Blackfriars, and City Thameslink. Your appointment takes approximately 20 minutes.
Pricing
Vitamin B12 (Active) (Venous)
Individual test
Phlebotomy Fee
Blood draw by qualified phlebotomist (per visit)
Total
£131Payment is collected at the clinic. The phlebotomy fee is charged once per visit, regardless of the number of tests booked.
Sample Information
Your Results
Your results will include reference ranges for each marker. If any values fall outside the expected range, we recommend booking a follow-up consultation or discussing the findings with your GP.
Nutritional Status Check
Vitamins are essential for energy, immunity, and optimal body function.
- Fatigue investigation
- Dietary concerns
- Vegetarian/vegan diet
- Absorption issues
- Supplementation guidance
- General wellbeing
How It Works
Book Online
Choose a convenient date and time
Visit Our Clinic
South Kensington or City of London
Quick Blood Draw
Professional phlebotomy - 5 minutes
Get Results
Results in 1 day"
Frequently Asked Questions
Common questions about this blood test
You May Also Be Interested In
Other blood tests you may want to consider alongside the Vitamin B12 (Active) (Venous)
Our City of London Clinic
Blood tests available at our City of London clinic
City of London
5 Ave Maria Lane
London EC4M 7AQ
- Near St Paul's Cathedral
- Central, Circle & District lines
Open 7 days a week • Walk-ins welcome • No GP referral needed
Ready to Book Your Test?
No GP referral needed. Book online and get tested at our City of London clinic. Results within 1 day".
What Our Patients Say
Real feedback from our patients at South Kensington Medical & Dental.
Meet Our Medical Team
Our experienced medical team is fully qualified and registered with the GMC and NMC, delivering safe, high-quality care in line with the highest professional standards.
Because our patients deserve nothing less.
Registered. Regulated. Trusted.
South Kensington Medical & Dental is registered with the Care Quality Commission (CQC) and our clinicians are registered with the relevant UK regulatory bodies, including the GDC and GMC. Our dentists, dental nurses and medical professionals deliver care that meets the highest clinical, safety and ethical standards, because our patients deserve nothing less.
