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Measures total and active B12 levels supporting neurological and haematological health.
A B12 blood test checks how much vitamin B12 (also called cobalamin) is in your blood. Vitamin B12 helps your body make healthy red blood cells and keeps your nerves working properly. Common B12 deficiency symptoms include tiredness, low energy, pins and needles, a sore tongue, memory problems and low mood. Our private B12 test is a quick and simple way to check your B12 levels and find out whether low B12 could be behind how you feel.
What It Measures: Vitamin B12 (cobalamin) levels in a venous blood sample. Looking for active B12 (holotranscobalamin)? See our separate Vitamin B12 Active (Cobalamin) Blood Test.
Who It’s For: Anyone with symptoms of low B12 or B12 deficiency, people following a vegan or vegetarian diet, people with gut conditions such as Crohn’s or coeliac disease, and anyone taking long-term medicines such as metformin.
Preparation: A standalone vitamin B12 test does not usually require fasting. Let us know if you take B12 supplements or have B12 injections, as these can raise your result.
Laboratory Processing: Simple, accurate blood test analysed in a UK laboratory with professional support available if required.
Turnaround Time: Same day or next working day depending on sample timing.
Booking Options: Clinic Visit, Home Visit (Essex only) or Kit Only (Venous Blood Collection). Find a B12 blood test near you using our clinic finder.
If you can’t find the test you’re looking for, simply give us a call and our support team will guide you to the right option. We’re here to ensure you get the correct test quickly and confidently.
A B12 blood test checks the level of vitamin B12 in your blood. Vitamin B12 helps your body make healthy red blood cells and keeps your nervous system working properly. Your body cannot make B12 itself, so it relies on food (mainly meat, fish, eggs and dairy), fortified products or supplements.
A private B12 test with Swift Blood Tests gives you a clear result you can act on quickly, whether you are checking for possible B12 deficiency, monitoring your levels or following a vegan or vegetarian diet. You can book a clinic appointment, a home visit if you live in Essex, or a venous collection kit.
This test measures vitamin B12 (cobalamin) in a venous blood sample. It is a focused vitamin B12 test, not a full nutritional or anaemia panel.
If you specifically want active B12 measured, also known as holotranscobalamin, Swift offers a separate Vitamin B12 Active (Cobalamin) Blood Test. Active B12 is the portion of B12 that is bound to the protein that delivers it to your cells, and some clinicians request it when a standard result is borderline or does not match symptoms.
Symptoms of low B12 often develop slowly and can be easy to put down to stress or a busy life. Common signs of vitamin B12 deficiency include:
A vitamin B12 blood test may be worth considering if any of the following apply to you:
A standard B12 result is a useful first step, but it is one piece of the picture. Some people have symptoms of deficiency with a result in the expected range, and clinicians sometimes use additional tests such as active B12, folate or a full blood count to look more closely. For balanced information, read the NHS guidance on vitamin B12 or folate deficiency anaemia.
B12 and folate work closely together, and a lack of either can cause a type of anaemia where red blood cells are larger than normal. Depending on your symptoms, you may want B12 on its own or as part of a wider check.
| Test | Best for |
|---|---|
| Vitamin B12 Blood Test (this test) | A focused check of your vitamin B12 level |
| Vitamin B12 Active (Cobalamin) Blood Test | Measuring active B12 (holotranscobalamin) specifically |
| Vitamin D, B12 & Folate Levels Blood Test | Checking B12 and folate together, plus vitamin D, in one appointment |
| Folate (Vitamin B9) Blood Test | Checking folate on its own |
| Anaemia Blood Test | Looking more widely at possible causes of anaemia |
| Tired All The Time Blood Test | Persistent fatigue where B12 is only one of several possible causes |
Choose this vitamin B12 test if B12 is the one result you want. If you are investigating ongoing tiredness, our guide to the best blood tests for fatigue explains which markers are commonly checked together.
Always follow the preparation instructions provided with your booking. If you are unsure whether your appointment timing is suitable, contact the Swift Blood Tests team before your visit.
Your result will show your vitamin B12 level alongside the laboratory's reference range. Reference ranges vary between laboratories, so your result should always be read against the range on your own report rather than figures found online.
A result within the expected range does not remove the need to seek advice if symptoms continue or get worse.
Looking for a B12 blood test near me or a private B12 test near me? Use the clinic finder to see Swift Blood Tests locations, or choose a home visit if you are in Essex and would rather have your blood taken at home.
A B12 blood test checks the level of vitamin B12 in your blood. Vitamin B12 helps your body make healthy red blood cells and supports your nervous system, and the result can be discussed with a GP or healthcare professional.
This test measures vitamin B12, also called cobalamin, in a venous blood sample. It is a focused B12 test rather than a full nutritional or anaemia panel.
A standard B12 test measures vitamin B12 in your blood. An active B12 test measures holotranscobalamin, the portion of B12 bound to the protein that delivers it to your cells. Swift offers a separate Vitamin B12 Active (Cobalamin) Blood Test if you want active B12 measured specifically.
Common symptoms of low B12 include tiredness and low energy, pins and needles, a sore red tongue, mouth ulcers, muscle weakness, memory or concentration problems, low mood and changes in vision. Seek medical advice promptly if you have numbness, balance problems or confusion.
A B12 blood test can show whether your B12 level is low, which is an important part of checking for deficiency. It cannot show the cause on its own, and some people have symptoms with a result in the expected range, so your result should be discussed with a GP or healthcare professional.
A standalone B12 test does not usually require fasting. If you are booking other tests at the same appointment, follow the preparation instructions for those tests, and always follow the instructions provided with your booking.
B12 supplements, multivitamins and injections can raise your result, so let the Swift Blood Tests team know what you take. Do not stop any prescribed medicine or B12 treatment unless your GP or healthcare professional advises you to.
You might consider a B12 test if you have symptoms such as ongoing tiredness or pins and needles, follow a vegan or vegetarian diet, have a gut condition such as Crohn's or coeliac disease, have had stomach surgery, or take medicines such as metformin long term.
B12 and folate work closely together, and a lack of either can cause a similar type of anaemia, so they are often checked together. Swift's Vitamin D, B12 and Folate Levels Blood Test checks both in one appointment.
Yes. Tiredness and low energy are among the most common symptoms of low B12. Fatigue has many possible causes, though, so a wider fatigue blood test may be more useful if B12 is only one of several things you want to check.
The current price for this test is shown in the booking options at the top of this page. Select your visit type and check your basket total before you pay.
You can book a clinic visit through the Swift Blood Tests clinic finder, choose a home visit if you are in Essex, or order a venous collection kit. Use the Find Your Nearest Clinic page to see locations.
Choose Clinic Visit, Home Visit (Essex only) or Kit Only in the booking options above and get a clear picture of your vitamin B12 level.
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Read All Our Google ReviewsGreat service. I’m not the best with needles, however, Jo made me feel comfortable and at ease which made the whole process much more tolerable. 5 stars from me.
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