People have the right to be involved in discussions and make informed decisions about their care, as described in making decisions about your care.
Making decisions using NICE guidelines explains how we use words to show the strength (or certainty) of our recommendations, and has information about prescribing medicines (including off-label use), professional guidelines, standards and laws (including on consent and mental capacity), and safeguarding.
This guideline contains recommendations about general principles of blood transfusion, and applies to a range of conditions and different settings. It does not make recommendations relating to specific conditions. For more information on what the guideline covers, see the context section.
Some people have religious beliefs that do not allow the transfusion of blood. Specific issues relating to these people have been addressed when reviewing the evidence and writing the recommendations.
A blood transfusion algorithm (PDF only) is also available.
Do not offer erythropoietin to reduce the need for blood transfusion in patients having surgery, unless:
the patient has anaemia and meets the criteria for blood transfusion, but declines it because of religious beliefs or other reasons or
the appropriate blood type is not available because of the patient's red cell antibodies.
Offer oral iron before and after surgery to patients with iron‑deficiency anaemia.
Consider intravenous iron before or after surgery for patients who:
have iron‑deficiency anaemia and cannot tolerate or absorb oral iron, or are unable to adhere to oral iron treatment (see the NICE guideline on medicines adherence)
are diagnosed with functional iron deficiency
are diagnosed with iron‑deficiency anaemia, and the interval between the diagnosis of anaemia and surgery is predicted to be too short for oral iron to be effective.
For guidance on managing anaemia in patients with chronic kidney disease, see the NICE guideline on chronic kidney disease: assessment and management.
Offer tranexamic acid to adults undergoing surgery who are expected to have at least moderate blood loss (greater than 500 ml). For advice on using tranexamic acid in primary hip, knee and shoulder replacement, see the NICE guideline on joint replacement (primary).
Consider tranexamic acid for children undergoing surgery who are expected to have at least moderate blood loss (greater than 10% blood volume).
Do not routinely use cell salvage without tranexamic acid.
Consider intra‑operative cell salvage with tranexamic acid for patients who are expected to lose a very high volume of blood (for example in cardiac and complex vascular surgery, major obstetric procedures, and pelvic reconstruction and scoliosis surgery).
Use restrictive red blood cell transfusion thresholds for patients who need red blood cell transfusions and who do not:
have major haemorrhage or
have acute coronary syndrome or
need regular blood transfusions for chronic anaemia.
When using a restrictive red blood cell transfusion threshold, consider a threshold of 70 g/litre and a haemoglobin concentration target of 70–90 g/litre after transfusion.
Consider a red blood cell transfusion threshold of 80 g/litre and a haemoglobin concentration target of 80–100 g/litre after transfusion for patients with acute coronary syndrome.
Consider setting individual thresholds and haemoglobin concentration targets for each patient who needs regular blood transfusions for chronic anaemia.
Consider single‑unit red blood cell transfusions for adults (or equivalent volumes calculated based on body weight for children or adults with low body weight) who do not have active bleeding.
After each single‑unit red blood cell transfusion (or equivalent volumes calculated based on body weight for children or adults with low body weight), clinically reassess and check haemoglobin levels, and give further transfusions if needed.
Offer platelet transfusions to patients with thrombocytopenia who have clinically significant bleeding (grade 2; see the table on World Health Organization [WHO] Bleeding Grades) – and a platelet count below 30×109 per litre.
Use higher platelet thresholds (up to a maximum of 100×109 per litre) for patients with thrombocytopenia and either of the following:
severe bleeding (WHO grades 3 and 4)
bleeding in critical sites, such as the central nervous system (including eyes).
Offer prophylactic platelet transfusions to patients with a platelet count below 10×109 per litre who are not bleeding or having invasive procedures or surgery, and who do not have any of the following conditions:
chronic bone marrow failure
autoimmune thrombocytopenia
heparin-induced thrombocytopenia
thrombotic thrombocytopenic purpura.
Consider prophylactic platelet transfusions to raise the platelet count above 50×109 per litre in patients who are having invasive procedures or surgery.
Consider a higher threshold (for example 50–75×109 per litre) for patients with a high risk of bleeding who are having invasive procedures or surgery, after taking into account:
the specific procedure the patient is having
the cause of the thrombocytopenia
whether the patient's platelet count is falling
any coexisting causes of abnormal haemostasis.
Consider prophylactic platelet transfusions to raise the platelet count above 100×109 per litre in patients having surgery in critical sites, such as the central nervous system (including the posterior segment of the eyes).
Do not routinely offer prophylactic platelet transfusions to patients with any of the following:
chronic bone marrow failure
autoimmune thrombocytopenia
heparin‑induced thrombocytopenia
thrombotic thrombocytopenic purpura.
Do not offer prophylactic platelet transfusions to patients having procedures with a low risk of bleeding, such as adults having central venous cannulation or any patients having bone marrow aspiration and trephine biopsy.
Do not routinely transfuse more than a single dose of platelets.
Only consider giving more than a single dose of platelets in a transfusion for patients with severe thrombocytopenia and bleeding in a critical site, such as the central nervous system (including eyes).
Reassess the patient's clinical condition and check their platelet count after each platelet transfusion, and give further doses if needed.
Only consider fresh frozen plasma transfusion for patients with clinically significant bleeding but without major haemorrhage if they have abnormal coagulation test results (for example, prothrombin time ratio or activated partial thromboplastin time ratio above 1.5).
Do not offer fresh frozen plasma transfusions to correct abnormal coagulation in patients who:
are not bleeding (unless they are having invasive procedures or surgery with a risk of clinically significant bleeding)
need reversal of a vitamin K antagonist.
Consider prophylactic fresh frozen plasma transfusions for patients with abnormal coagulation who are having invasive procedures or surgery with a risk of clinically significant bleeding.
Reassess the patient's clinical condition and repeat the coagulation tests after fresh frozen plasma transfusion to ensure that they are getting an adequate dose, and give further doses if needed.
Consider cryoprecipitate transfusions for patients without major haemorrhage who have:
clinically significant bleeding and
a fibrinogen level below 1.5 g/litre.
Do not offer cryoprecipitate transfusions to correct the fibrinogen level in patients who:
are not bleeding and
are not having invasive procedures or surgery with a risk of clinically significant bleeding.
Consider prophylactic cryoprecipitate transfusions for patients with a fibrinogen level below 1.0 g/litre who are having invasive procedures or surgery with a risk of clinically significant bleeding.
Use an adult dose of 2 pools when giving cryoprecipitate transfusions (for children, use 5–10 ml/kg up to a maximum of 2 pools).
Reassess the patient's clinical condition, repeat the fibrinogen level measurement and give further doses if needed.
Offer immediate prothrombin complex concentrate transfusions for the emergency reversal of warfarin anticoagulation in patients with either:
severe bleeding or
head injury with suspected intracerebral haemorrhage.
For guidance on reversing anticoagulation treatment in people who have a stroke and a primary intracerebral haemorrhage, see the section on reversal of anticoagulation treatment in people with haemorrhagic stroke in the NICE guideline on stroke and transient ischaemic attack in over 16s.
Consider immediate prothrombin complex concentrate transfusions to reverse warfarin anticoagulation in patients having emergency surgery, depending on the level of anticoagulation and the bleeding risk.
Monitor the international normalised ratio (INR) to confirm that warfarin anticoagulation has been adequately reversed, and consider further prothrombin complex concentrate.
For advice on reversing direct-acting oral anticoagulants (DOACs), see the MHRA safety advice on DOACs for a list of reversal agents, and NICE's technology appraisal guidance on andexanet alfa for reversing anticoagulation from apixaban or rivaroxaban.
Monitor the patient's condition and vital signs before, during and after blood transfusions, to detect acute transfusion reactions that may need immediate investigation and treatment.
Observe patients who are having or have had a blood transfusion in a suitable environment with staff who are able to monitor and manage acute reactions.
Consider using a system that electronically identifies patients to improve the safety and efficiency of the blood transfusion process.
Provide verbal and written information to patients who may have or who have had a transfusion, and their family members or carers (as appropriate), explaining:
the reason for the transfusion
the risks and benefits
the transfusion process
any transfusion needs specific to them
any alternatives that are available, and how they might reduce their need for a transfusion
that they are no longer eligible to donate blood
that they are encouraged to ask questions.
Document discussions in the patient's notes.
Provide the patient and their GP with copies of the discharge summary or other written communication that explains:
the details of any transfusions they had
the reasons for the transfusion
any adverse events
that they are no longer eligible to donate blood.
For guidance on communication and patient‑centred care for adults, see the NICE guideline on patient experience in adult NHS services.
For guidance on blood transfusions for people with acute upper gastrointestinal bleeding, see the section on resuscitation and initial management in the NICE guideline on acute upper gastrointestinal bleeding in over 16s.
These are defined as:
Children: over 1 year to under 16 years.
Young people: 16 years to under 18 years. No evidence was found on transfusions specifically for young people. Recommendations for adults in this guideline will generally apply to young people as well, but healthcare professionals should use their clinical judgement on when this is not appropriate for individual patients.
Adults: 18 years or older.
This can be defined as any of the following:
The loss of more than 1 blood volume within 24 hours (around 70 ml/kg, or more than 5 litres in a 70 kg adult).
A loss of 50% of total blood volume in under 3 hours.
Bleeding in excess of 150 ml/minute in adults.
As a practical clinical definition, bleeding which leads to:
a systolic blood pressure of less than 90 mm/Hg or
a heart rate of more than 110 beats per minute in adults.
This was used to assess bleeding in trials of platelet transfusions. Examples of bleeding at each grade are listed below:
| World Health Organization Bleeding Grade | Examples |
|---|---|
|
1 |
|
|
2 |
|
|
3 |
|
|
4 |
|