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Patient blood management and transfusion consent

Essential points for quick revision.

2 min synopsisUK scopeSources checked 27 Aug 2026Clinical review pending
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Immediate transfusion without prior discussion

Life-saving treatment can proceed when delay to obtain consent would endanger a patient who lacks capacity, but emergency necessity does not erase documentation or later communication duties.

Action: Confirm and document the immediate indication, capacity assessment, why delay is unsafe and any known valid advance decision, treatment refusal or patient-specific limitation. Use the least blood necessary in the patient's best interests and involve a senior clinician. As soon as the patient regains capacity, provide a face-to-face retrospective discussion covering what was given, why, material risks or reactions and implications including future donation; document the conversation and inform the GP or continuing team.

Synopsis

Optimise the patient's own blood, minimise avoidable loss, use evidence-based transfusion and obtain valid documented consent or refusal across elective and emergency care.

  • Patient blood management combines three goals: optimise red-cell mass, minimise blood loss and harness physiological tolerance of anaemia while transfusing only when benefit exceeds risk.
  • Screen for anaemia early before surgery with expected blood loss, classify the cause and allow time for oral or intravenous iron and other targeted treatment.
  • First-line for iron-deficiency anaemia is oral iron when tolerated and time permits; use intravenous iron for intolerance, malabsorption, functional deficiency, non-adherence or insufficient time for oral response.

Key red flags

Proceeding with elective transfusion after an informed capacitous refusal is unlawful even when clinicians strongly recommend treatment; escalate alternatives and document clearly.

Investigation priorities

01
First-line: full blood count and indicesFirst stepFirst line

Detect preoperative anaemia and classify microcytic, normocytic or macrocytic patterns.

02
First-line: ferritin and iron studiesFirst line

Confirm absolute or functional iron restriction and guide oral versus intravenous replacement.

Management branches

Preoperative anaemiaFind and treat the cause early

Anaemia is identified before surgery with expected blood loss.

  1. Classify anaemia with FBC, ferritin and directed B12, folate, renal, inflammatory, haemolysis and bleeding assessment.
  2. Start oral iron first-line when tolerated and time permits; use intravenous iron for NICE-defined intolerance, malabsorption, adherence, functional or timing reasons.

Key medicines

Ferrous sulfate for iron-deficiency anaemiaGive one 200 mg ferrous sulfate tablet orally once daily, providing about 65 mg elemental iron; if not tolerated, use one tablet on alternate days, a different oral preparation or intravenous iron. Check response within about 4 weeks and continue for around 3 months after haemoglobin normalises to replenish stores.
Tranexamic acid for routine surgical blood conservationGive 1 g intravenously slowly just before surgery in a typical adult when the procedure breaches skin or mucosa and has any risk of bleeding; use the relevant specialty and local regimen when repeated or weight-based dosing is required.
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Sources and review status4 sources · checked 27 Aug 2026 · clinical review pending
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom