Blood transfusion
Receiving donated blood, or part of blood, through a thin tube into a vein, usually to treat severe anaemia, blood loss or low blood counts.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- A transfusion gives you donor blood or part of blood through a vein, usually for severe anaemia, blood loss or very low blood counts.
- It treats the problem now but does not cure the underlying cause, which still needs its own treatment.
- UK blood is tested, group-matched and identity-checked at the bedside, making transfusion very safe — but not completely without risks.
- Where there is time, iron, medicines or other measures may reduce or avoid the need for a transfusion, so it is fair to ask about alternatives.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Can quickly raise a dangerously low blood count and relieve symptoms such as severe tiredness or breathlessness
When anaemia can be safely corrected another way, such as iron for iron deficiency, where there is time to wait.
Staff monitor you closely, especially in the first 15 minutes. Tell them at once if you feel hot, cold, shivery, breathless, itchy or have back or chest...
Close monitoring during the transfusion, especially in the first 15 minutes, by trained staff.
Staff monitor you closely, especially in the first 15 minutes. Tell them at once if you feel hot, cold, shivery...
The cannula is removed. Most people can go home the same day unless they are in hospital for other reasons. You...
Symptoms from anaemia, such as tiredness and breathlessness, often improve as the new red cells take effect.
Watch for any delayed reaction, such as a temperature, yellowing of the skin or eyes, or dark urine, and report...
What it is
A blood transfusion means receiving donated blood, or one part of blood, through a thin tube (a cannula) into a vein. It is used when your body does not have enough healthy blood, or enough of one type of blood cell, to work safely.
In haematology, transfusions are common. Red cell transfusions treat severe anaemia, for example in some blood cancers, after chemotherapy, or in sickle cell disease and thalassaemia. Platelet transfusions help when platelets are very low and there is a risk of bleeding. Plasma or other products help with clotting problems.
A transfusion treats the problem now — it does not cure the underlying cause. Whether you need one depends on your blood test results, your symptoms and your overall situation, not on a single number alone. Where there is time, your team should discuss the reasons, benefits, risks and any alternatives with you, and ask for your consent.
In the UK, donated blood is carefully tested, matched to your blood group and checked against your identity at the bedside. This makes transfusion very safe, although, like any treatment, it is not completely without risk.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Transfusion compared with treating the cause first
| Option | What it does | When it is used |
|---|---|---|
| Red cell transfusion | Raises blood count quickly | Severe or symptomatic anaemia, significant bleeding |
| Iron (tablets or drip) | Helps your body make its own red cells | Iron-deficiency anaemia where there is time to wait |
| Treating the cause | Tackles bleeding or marrow problem | When the underlying cause can be corrected |
| Cell salvage (in surgery) | Reuses your own blood | Some planned operations with expected blood loss |
These are not either/or — you may need a transfusion now and treatment of the cause as well. Your team will explain what is most appropriate.
Preparing for your treatment
- Where there is time, talk through why a transfusion is advised, the benefits, the risks and any alternatives, and give or withhold consent.
- Tell your team if you have had a transfusion before, especially if you had any reaction, or if you have antibodies from previous transfusions or pregnancy.
- Mention your beliefs about transfusion; if you would decline blood, say so early so alternatives and plans can be discussed and respected.
- A blood sample is taken first to confirm your blood group and cross-match suitable blood — this can take some time in the lab.
- You will be asked to confirm your name and date of birth and will wear an identity wristband that is checked against the blood.
- Let staff know about any allergies or previous drug or transfusion reactions.
- For planned transfusions, ask roughly how long it will take so you can arrange your day.
What happens
A blood sample is taken and sent to the laboratory to confirm your blood group and find compatible blood. Before the transfusion starts, staff carry out a strict identity check, asking your name and date of birth and matching your wristband to the blood bag, because giving the wrong blood is one of the most important risks to prevent.
A thin tube (cannula) is placed in a vein, usually in your arm, and the blood bag is connected like a drip. The blood runs in slowly. A unit of red cells usually takes up to about 4 hours, while platelets and plasma are quicker.
Staff check your temperature, pulse and blood pressure before you start, soon after starting, and during the transfusion, because most serious reactions show up early. You can usually sit and read or rest during this time.
Tell staff straight away if you feel unwell at any point — for example shivery, hot, breathless, itchy, or with pain in your back or chest. Reactions are uncommon and usually mild, but early reporting lets the team act quickly.
Is this treatment right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- When anaemia can be safely corrected another way, such as iron for iron deficiency, where there is time to wait.
- When the risks of fluid overload outweigh the benefit, unless given slowly and carefully in frail or heart-failure patients.
- When a person with capacity has chosen to decline blood; their wishes must be respected and alternatives discussed.
- As a treatment for the underlying cause itself, which still needs its own diagnosis and management.
- When a private setting cannot safely manage a possible reaction; transfusion needs trained staff and emergency support.
Delay or rearrange if…
- The transfusion is not urgent and iron or other treatment could be tried first.
- Blood group and cross-match results are not yet confirmed (except in a life-threatening emergency).
- You have a temperature or active infection that should be reviewed first, where the transfusion can wait.
- There is uncertainty about the indication that an experienced clinician should review.
- Your wishes or an advance decision about transfusion have not yet been clarified.
Alternatives to discuss
- Iron tablets or an iron infusion for iron-deficiency anaemia where there is time.
- Treating the underlying cause, such as stopping bleeding or treating a marrow disorder.
- Medicines that stimulate red cell production in selected conditions, under specialist advice.
- Cell salvage, tranexamic acid and correcting anaemia before planned surgery to reduce donor blood use.
- Accepting a lower blood count with monitoring, if you have few symptoms and are otherwise stable.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Can quickly raise a dangerously low blood count and relieve symptoms such as severe tiredness or breathlessness
- Replaces blood lost through bleeding, surgery or childbirth
- Reduces the risk of bleeding when platelets are very low
- Supports people through chemotherapy and other treatments that lower blood counts
- Can be life-saving in an emergency
- Uses UK-donated blood that is tested and matched to your blood group
Risks & complications
- Mild reactions such as a temperature, chills or a rash, often settling with simple treatment
- Discomfort or bruising where the cannula goes in
- Feeling tired after the appointment
- Itching or feeling flushed during the transfusion
- A more troublesome allergic reaction needing treatment and slowing or stopping the transfusion
- Fluid overload, where the extra fluid is too much for the heart, causing breathlessness (more likely in older or frail people)
- Developing antibodies that can make future cross-matching harder
- Iron build-up in the body in people who have many transfusions over time
- A serious allergic (anaphylactic) reaction, which the team is trained to treat
- A reaction from blood being given to the wrong person, which strict identity checks are designed to prevent
- A serious lung reaction (such as transfusion-related lung injury)
- Infection passed on through blood, which is very rare because of careful donor testing
In the UK, transfusion is very safe because of careful donor testing, blood-group matching and bedside identity checks, and serious harm is rare. The risks that matter most are giving blood to the wrong person (which the identity check prevents), reactions in the first 15 minutes, and fluid overload in frail or elderly patients. The clearest thing you can do is tell staff immediately if you feel unwell during the transfusion. Where there is time, it is reasonable to ask whether iron or other measures could reduce or avoid the need for blood.
Published figures to discuss
Serious transfusion reactions are rare in the UK, and figures come from national haemovigilance reporting (the SHOT scheme) rather than from any single clinic. These are population estimates: your own risk depends on your health, how many transfusions you have and your antibody status. Most reported transfusion incidents are linked to human error, which is why the bedside identity check matters so much. Rates change over time as safety improves, so treat any figure as approximate.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Death related to transfusion | Very rare; UK haemovigilance (SHOT) has estimated roughly 1 in 300,000 components issued | A national, approximate estimate from one year's data, not a personal prediction. Overall transfusion in the UK is very safe. | NHS — Blood transfusionnhs.ukPublished figure |
| Major illness related to transfusion | Uncommon; SHOT has estimated roughly 1 in 20,000 components issued | Most serious events relate to human error rather than the blood itself, which strict checks aim to prevent. | NHS — Blood transfusionnhs.ukPublished figure |
| Infection passed on through blood | Very rare in the UK because of donor screening and testing | Much lower than the risks above; exact figures vary by infection and year. Not zero, but very small. | NHS — Blood transfusionnhs.ukSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is usually no physical recovery from a transfusion itself. Many people feel better within a day as the new blood takes effect, although you may feel tired afterwards. The underlying cause of your low blood count still needs its own treatment and follow-up.
- Feeling more energetic within a day if you were very anaemic
- Mild tiredness or a slight temperature on the day, which usually settles
- Some bruising or tenderness where the cannula was
- No change in how you feel if the transfusion was preventing a problem rather than treating symptoms
Aftercare
- Tell staff straight away during the transfusion if you feel unwell in any way.
- After going home, report a temperature, yellowing of skin or eyes, dark urine, breathlessness or feeling unwell.
- Keep any transfusion record or card you are given, as it is useful for future care.
- If you have regular transfusions, attend iron-monitoring tests and any iron-removing treatment as advised.
- Make sure the underlying cause of your anaemia or low counts is being investigated and followed up.
- Note that, in the UK, once you have had a transfusion you can no longer become a blood donor.
- Ask your team when, and whether, you might need another transfusion or a blood test to check.
- Knowing why you are having the transfusion and what the alternatives were
- A clear plan for how long it will take and who is looking after you
- Knowing the warning signs of a reaction and who to tell during and after
- Any transfusion record or alert card kept safe
- A follow-up plan for the underlying cause of your low blood count
- For regular transfusions, iron-monitoring and chelation arrangements in place
- Transport home arranged if you will be tired
Scars and how they heal
There is no surgical wound. Blood is given through a thin cannula in a vein, usually in the arm or back of the hand. You may have minor bruising or tenderness at the cannula site for a few days, and people who have many transfusions over time may find veins become harder to use.
⚠ Get urgent help if…
- Breathlessness, chest or back pain, or feeling very unwell during the transfusion — tell staff immediately
- A rash, itching, swelling of the face or lips, or difficulty breathing — possible allergic reaction
- Shivering, fever or feeling hot and cold during or soon after the transfusion
- Yellowing of the skin or eyes, or dark or red-brown urine, in the hours or days after
- Feeling faint, a racing heartbeat, or sudden severe headache
- Increasing breathlessness or swelling in the days after (possible fluid overload), especially if you have heart problems
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
A good result means your blood count is raised to a safer level and any symptoms, such as severe tiredness or breathlessness, ease, usually within a day. For platelet or plasma transfusions, the aim is to reduce bleeding risk or help blood to clot.
A transfusion does not cure the cause of your low blood count. If the underlying problem continues — for example ongoing bleeding, a marrow disorder, or a condition such as thalassaemia — you may need further transfusions or other treatment. Your team will use blood tests to judge whether the transfusion has done what was intended.
How long the benefit lasts depends on the cause. After a one-off bleed that has been fixed, a transfusion may be all you need. In ongoing conditions, the effect is temporary and you may need repeated transfusions. Regular transfusions over time can lead to iron building up in the body, which is monitored and may need iron-removing (chelation) treatment.
Related tests, treatments or support
Transfusion is usually given alongside treatment of the underlying cause, such as iron for iron deficiency, chemotherapy for a blood cancer, or specific treatment in sickle cell disease and thalassaemia. In planned surgery, measures such as cell salvage, tranexamic acid or correcting anaemia beforehand can reduce how much donor blood is needed.
Follow-up & long-term care
Follow-up focuses on the reason you needed blood. You may have repeat blood tests to check your count, and investigations to find or treat the cause. People on regular transfusion programmes have planned reviews, iron monitoring and, where needed, chelation treatment. Report any delayed reaction symptoms to your team.
- Repeat blood tests to check whether the transfusion worked and whether more is needed
- Investigation and treatment of the underlying cause of low blood counts
- Iron-level monitoring for people having regular transfusions
- Iron-removing (chelation) treatment if iron builds up over time
- Keeping a transfusion record for future care
Repeat, follow-on and what comes next
- You may need more than one unit, or repeat transfusions, depending on the cause.
- Some conditions need a long-term regular transfusion programme rather than a one-off.
- Developing antibodies from previous transfusions or pregnancy can make finding compatible blood take longer next time.
- Iron build-up from repeated transfusions may need ongoing chelation treatment.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- Close monitoring during the transfusion, especially in the first 15 minutes, by trained staff.
- Clear, written warning signs and a contact route for delayed reactions after you go home.
- A plan to investigate and treat the underlying cause of your low blood count.
- Iron monitoring and chelation arranged for anyone on a regular transfusion programme.
- A transfusion record kept for future care, and coordination with your NHS team.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether the transfusion is a one-off or part of a regular programme
- The type and number of components needed (red cells, platelets, plasma)
- Laboratory cross-matching and any antibody investigations
- Day-unit or facility time and nursing monitoring during the transfusion
- Iron-monitoring and chelation treatment for people on regular transfusions
- Investigation and treatment of the underlying cause of the low blood count
- Management of any reaction or complication
- The facility or day-unit fee and nursing monitoring time
- Laboratory cross-matching and any special blood requirements
- The number of units or components expected
- Follow-up blood tests to check the result
- How a reaction or complication would be managed and covered
- For regular transfusions, iron-monitoring and chelation costs
- How investigation of the underlying cause is arranged and coordinated with the NHS
On the NHS? Blood transfusions are provided on the NHS when clinically needed; private care may give transfusions as part of other treatment, drawing on the same UK-tested national blood supply.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Not being told why a transfusion is advised, or what the alternatives are, when there is time to discuss it.
- Alternatives such as iron not being considered before transfusing.
- Your wishes or beliefs about receiving blood not being asked about early.
- Not being told the warning signs of a reaction, or who to contact afterwards.
- No clear plan to investigate and treat the underlying cause.
Marketing red flags
- Offering transfusions, 'blood boosts' or infusions privately for tiredness or wellness without a clear medical need.
- Skipping the discussion of alternatives such as iron when there is time.
- Downplaying that transfusion has any risk at all.
- Giving blood without proper laboratory cross-matching and bedside identity checks.
- No arrangements to safely manage a reaction or to follow up the underlying cause.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- Why do I need a transfusion now, and what would happen if I waited?
- Are there alternatives for me, such as iron, that could reduce or avoid the need?
- How many units do you expect to give, and how long will it take?
- What warning signs of a reaction should I look out for, during and afterwards?
- What is being done to find and treat the cause of my low blood count?
- If I need regular transfusions, how will iron build-up be monitored and managed?
- How will you respect my wishes if I have concerns about receiving blood?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my treatment, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this treatment not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Is a blood transfusion safe?
Can I catch an infection from donated blood?
Are there alternatives to a transfusion?
How long does a transfusion take?
Will I feel different afterwards?
Can I refuse a blood transfusion?
Can I give blood after having a transfusion?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NHS — Blood transfusion NHS Blood and Transplant — Blood transfusion Serious Hazards of Transfusion (SHOT) — UK haemovigilance NICE NG24 — Blood transfusion NHSBT Hospitals — Patient information leaflets British Society for Haematology — Transfusion guidelines
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
Related guides: Sickle cell and thalassaemia management · Chemotherapy · Raised or abnormal blood count investigation · Myeloproliferative disorder management · Iron infusion (intravenous iron)