Pernicious anaemia assessment in Reading
If you have been told you may have pernicious anaemia, or you are worried about B12 deficiency linked to poor absorption, you can book a careful GP-led assessment with me, Dr Asim Naqvi, to help you understand your results, symptoms and next steps.
Worried about pernicious anaemia or B12 absorption?
I often see people who have been told they may have pernicious anaemia, but have not had a clear explanation of what it means.
Some have low or borderline B12 results. Others have symptoms that fit possible B12 deficiency, but their results have been described as “normal”. Some have already started B12 injections or tablets and want to understand whether the underlying cause has been properly considered.
My role is to look at the whole picture – your symptoms, medical history, risk factors, blood results, possible absorption problems and response to any previous treatment – before advising on the most sensible next step.
My role is to look at the whole picture – your symptoms, medical history, risk factors, blood results, possible absorption problems and response to any previous treatment – before advising on the most sensible next step.
What is pernicious anaemia?
Pernicious anaemia is commonly used to describe B12 deficiency linked to problems absorbing vitamin B12, often because of autoimmune changes affecting the stomach.
Vitamin B12 from food normally needs to be absorbed through a process involving the stomach and a substance called intrinsic factor. If the immune system affects the stomach cells involved in this process, B12 absorption can fall over time.
Current UK guidance uses the term autoimmune gastritis for this process, and notes that autoimmune gastritis is sometimes referred to as pernicious anaemia. The NHS also describes pernicious anaemia as a condition where the immune system attacks healthy stomach cells, affecting the body’s ability to absorb B12.
This can be confusing for patients because different clinicians may use different wording. My aim is to help you understand what your results and symptoms may mean in practical terms.
Symptoms I often review
Pernicious anaemia can lead to B12 deficiency, and B12 deficiency can affect people in different ways. Symptoms can also overlap with other conditions, so it is important not to assume everything is caused by B12.
I do not treat a number on a screen. I look at the person in front of me, the pattern of symptoms, the risk factors, the blood results, the possible causes and the response to any previous treatment.
I also look for other contributors, because B12 is not always the whole story.
Fatigue, weakness and low energy
You may feel unusually tired, physically weaker than normal, drained after simple tasks or unable to recover in the way you used to.Brain fog, memory and concentration problems
Some people describe poor memory, slower thinking, reduced focus or feeling mentally unlike themselves.Pins and needles or nerve-type symptoms
This may include tingling, numbness, burning feet, altered sensation, nerve pain, balance problems or poor coordination.Dizziness, light-headedness or palpitations
These symptoms can feel unsettling, particularly if routine checks have not given a clear explanation.Mouth, tongue and mood symptoms
This may include a sore or red tongue, mouth ulcers, burning mouth, low mood, anxiety or changes in confidence.Symptoms despite reassurance or treatment
Some people come to me because they still feel unwell despite B12 tablets, B12 injections, previous reassurance or results that have been called “normal”.
Why pernicious anaemia can be missed or confusing
Pernicious anaemia is not always straightforward. It can be misunderstood, diagnosed late or discussed in a way that leaves patients unsure about what is happening.
The name itself can be misleading
The word “anaemia” can make it sound as though the condition only matters when red blood cells are abnormal. In practice, B12-related symptoms can involve energy, nerves, thinking, mood, balance and mouth symptoms too.
Blood results need context
A B12 result may be clearly low, borderline, affected by supplements or difficult to interpret. I look at the result alongside your symptoms, risks and wider blood tests.
Symptoms can overlap with other conditions
Fatigue, dizziness, nerve symptoms, pain and brain fog can have many possible causes. B12 may be part of the picture, but so might iron deficiency, thyroid disease, inflammation, vitamin D deficiency or other medical issues.
Testing is not always definitive
Tests such as anti-intrinsic factor antibodies can be useful when autoimmune gastritis is suspected, but a negative result does not always rule it out. This is why clinical judgement and the wider picture matter.
Treatment may need long-term planning
If B12 deficiency is caused by a long-term absorption problem, treatment and monitoring may need to be considered differently from a short-term dietary deficiency.
Follow-up is often missing
I often see patients who have been started on treatment but have not had a clear review of symptoms, response, cofactors or whether any further assessment is needed.
Risk factors I consider
Autoimmune gastritis or pernicious anaemia
Other autoimmune conditions
Gut health and surgery
Family history
Medication effects
Cofactors and overlapping deficiencies
My approach to pernicious anaemia assessment
Your symptom pattern
Your previous results
Possible absorption problems
Pernicious anaemia testing
Cofactors and alternative diagnoses
A practical plan
Blood tests for pernicious anaemia
Blood tests can be helpful, but they need careful interpretation.
Depending on your situation, I may review or arrange tests such as:
- Full blood count
- Vitamin B12
- Active B12, where available
- Folate
- Ferritin and iron studies
- Thyroid function
- Vitamin D
- Inflammatory markers
- Anti-intrinsic factor antibodies, where appropriate
- Other tests if the wider picture suggests they are needed
If you have already started B12 tablets, sprays, patches or injections, it is important to tell me what you have taken and when. B12 supplements can affect blood test results, which can make interpretation more difficult.
I will explain what your results show, what they do not prove and whether the pattern fits possible pernicious anaemia, another cause of B12 deficiency or a different issue.
B12 treatment and follow-up
Treatment depends on the likely cause, your symptoms, whether absorption is a concern and whether there are neurological features.
Some people may need B12 injections. Others may be suitable for oral B12. For some patients, treatment may be short term. For others, especially where absorption is a long-term issue, ongoing treatment and monitoring may be needed.
Response also varies. Some symptoms may begin to improve relatively quickly, while others can take longer. If symptoms do not improve as expected, that does not always mean “more B12” is the answer. It may mean we need to review the diagnosis, look for cofactors or consider another cause.
B12 injections where appropriate
If injections are suitable, I will explain why they are being recommended, what they are intended to do and how response should be reviewed.
Oral B12 where suitable
For some people, B12 tablets may be appropriate depending on the suspected cause, risk factors and clinical situation.
Monitoring and follow-up
Where treatment is started, I can review symptoms, blood results and treatment response so the plan remains clear and clinically sensible.
Advice if the picture does not fit
If symptoms do not fit pernicious anaemia or B12 deficiency, or response is not as expected, I will explain what else should be considered.
Pernicious anaemia can be part of a wider clinical picture
Some patients have more than one contributor to their symptoms. Others have a B12 issue, but also have iron deficiency, folate problems, thyroid disease, inflammation or another medical condition that needs attention.
Iron and ferritin
Folate and vitamin D
Thyroid and inflammation
Gut and autoimmune background
Stomach symptoms and specialist referral
Pernicious anaemia and autoimmune gastritis relate to the stomach, so it is important to take new or concerning digestive symptoms seriously.
The NHS notes that people with vitamin B12 deficiency caused by pernicious anaemia can have an increased risk of stomach cancer. This does not mean you should panic, but it does mean persistent or concerning stomach symptoms should be assessed properly.
I may advise speaking to your NHS GP or considering specialist referral if you have symptoms such as:
- Persistent indigestion or upper abdominal pain
- Unexplained weight loss
- Difficulty swallowing
- Vomiting blood or black stools
- New persistent change in appetite
- Ongoing symptoms that do not fit a simple deficiency picture
If symptoms are severe, sudden or unsafe to wait, please seek urgent medical help.
What happens when you book a consultation
You tell me what has been happening
I start by listening. I want to understand what has changed, how long your symptoms have been present and how they are affecting your work, family life, exercise, mood and confidence.
I review your background carefully
I look at your medical history, medication, diet, gut symptoms, menstrual history, family history, previous diagnoses and any past investigations.
I assess your risk factors
This may include autoimmune disease, gut problems, medication effects, vegan or restricted diet, nitrous oxide exposure, bariatric surgery, heavy periods or a family history of related conditions.
I interpret your results in context
I review relevant results such as B12, folate, ferritin, iron studies, vitamin D, thyroid markers and other tests where available.
I explain my clinical opinion clearly
I will explain what I think may be going on, what the results support, what they do not prove and whether B12, iron or another issue seems most relevant.
We agree a practical plan
Your plan may include further testing, B12 treatment, iron treatment, monitoring, symptom tracking, lifestyle advice, a GP letter or referral where appropriate.
B12 Metabolic Clinic is not an emergency service
Please seek urgent help through NHS 111, 999 or A&E if you have severe chest pain, sudden shortness of breath, fainting, weakness on one side of the body, new confusion, black stools, heavy bleeding, rapidly worsening symptoms or anything that feels severe, sudden or unsafe to wait.
If you have new or rapidly worsening neurological symptoms, severe weakness, problems walking or symptoms that feel unsafe to wait, please seek urgent medical advice.
Book a pernicious anaemia assessment with me
If you are worried about pernicious anaemia, autoimmune gastritis, B12 absorption or symptoms that have not been fully explained, you do not need to work it out alone.
I will take time to listen, review your symptoms and results carefully and help you understand the most sensible next step.
Frequently asked questions
If you are considering an appointment, you may have questions about blood tests, B12 injections, iron infusions or whether this clinic is right for your symptoms. I have answered some of the most common questions below, but if you are unsure, you are welcome to get in touch before booking.
- What is pernicious anaemia?
Pernicious anaemia is commonly used to describe B12 deficiency caused by problems absorbing vitamin B12, often because of autoimmune changes affecting the stomach. Current UK guidance often refers to this process as autoimmune gastritis.
- Can pernicious anaemia affect iron or folate?
It can sit alongside other deficiencies or overlapping issues. I often review ferritin, iron studies, folate and related markers because symptoms may not be caused by B12 alone.
- Will I need B12 injections for life?
Some people with long-term absorption problems may need ongoing treatment, but this depends on the cause and clinical situation. I will explain what is appropriate for you after assessment.
- Is pernicious anaemia the same as B12 deficiency?
No. Pernicious anaemia is one possible cause of B12 deficiency. B12 deficiency can also be linked to diet, medication, gut absorption problems, surgery, nitrous oxide exposure or other medical issues.
- Can pernicious anaemia cause symptoms without obvious anaemia?
Yes. B12-related symptoms can occur even when anaemia is not obvious. That is why I look at symptoms, risk factors and blood results together rather than relying on a single result.
- What if my intrinsic factor antibody test is negative?
A negative result can be useful information, but it does not always fully rule out autoimmune gastritis or an absorption problem. I would interpret it alongside your symptoms, B12 results, risk factors and wider clinical picture.
- What tests can help with pernicious anaemia?
Tests may include B12, active B12 where available, full blood count, folate, ferritin, iron studies and anti-intrinsic factor antibodies where appropriate. Some tests can support the diagnosis, but no single test gives the whole answer.
- How is this different from a standard pernicious anaemia or B12 appointment?
My approach is GP-led and whole-person. I do not look at pernicious anaemia as a single blood test result or simply advise injections without context.
I review your symptoms, B12 results, full blood count, folate, ferritin, iron studies, autoimmune background, gut history, medication and any previous response to treatment. This helps me consider whether pernicious anaemia, another cause of B12 deficiency or an overlapping issue may be contributing to how you feel.
- Where is B12 Metabolic Clinic based?
B12 Metabolic Clinic is located at The Forbury Clinic in Reading, Berkshire.
Remote consultations may also be available where clinically appropriate. If blood tests, B12 injections or iron infusions are needed, I will explain what can be arranged safely and practically.