Blood Transfusion in Surgery: SU3.1 Guide for MBBS Students
A patient with gastrointestinal bleeding is pale and tachycardic. The team asks for blood. The important question is not only “What is the haemoglobin?” but also “What does this patient need, why, and how can we give it safely?” That is the heart of
SU3.1: describing the indications and appropriate use of blood and blood products, and complications of transfusion. The NMC curriculum lists this as a General Surgery competency, taught through lectures and small-group discussion and assessed in written and viva formats, with Pathology integration. 1
Why this competency matters
Transfusion can save life, but it is not risk-free and should not be used as a substitute for diagnosis, haemorrhage control, or appropriate treatment of anaemia. Good practice means choosing the right component for a defined clinical need, avoiding unnecessary transfusion, and recognising harm early. In surgery, you will encounter this in trauma, perioperative care, gastrointestinal bleeding, and postoperative anaemia. India’s National Institute of Biologicals (NIB) guidance emphasizes rational use, patient identification, bedside checks, and haemovigilance. 2
Know the component—and the purpose
- Packed red blood cells (PRBCs): improve oxygen-carrying capacity in clinically significant anaemia or blood loss. They are not a routine volume expander.
- Platelets: used for clinically important thrombocytopenic bleeding, selected prophylaxis, or procedures when indicated by the clinical context and local protocol.
- Fresh frozen plasma (FFP): supplies clotting factors for relevant coagulopathy, especially with bleeding or an urgent procedure. It is not for simple volume replacement or nutrition.
- Cryoprecipitate: provides fibrinogen and selected clotting proteins; consider it when fibrinogen is low in a bleeding patient, guided by laboratory results and protocol.
- Whole blood: has limited, protocol-specific uses; component therapy is more common.
For a stable, non-bleeding hospitalized adult, the 2023 AABB guideline recommends considering red-cell transfusion when haemoglobin is below 7 g/dL. This is a decision aid—not a universal trigger. Active bleeding, symptoms, haemodynamic status, comorbidity, and the whole clinical picture matter; follow current local and national protocols. 3 4
What should an MBBS student be able to do?
Cognitive: know and explain
Be ready to describe the purpose of each component, common indications, important contraindications or inappropriate uses, and the major complications. In an exam answer, organise it as: indication → component → key safety checks → monitoring → complications and first response. Remember that haemoglobin alone does not determine the decision.
Psychomotor: demonstrate safely under supervision
You are expected to understand and practise the transfusion workflow in a supervised setting—not to independently prescribe or administer blood beyond your authorised role. Use a checklist and your institution’s policy:
- Confirm the indication, prescription, alternatives, and valid consent. Explain the plan in language the patient understands.
- Take and label the pre-transfusion sample at the bedside using the patient’s identifiers; complete the request accurately. The blood bank performs grouping and compatibility testing.
- Immediately before starting, match the patient, prescription, compatibility information, and blood component label at the bedside. Check the component and expiry, and resolve any mismatch before proceeding.
- Record baseline observations. Use the prescribed blood administration set and follow local instructions for starting, observation, and completion time. Stay especially alert early in the transfusion and continue monitoring as required by policy.
- Document the component, unit details, start and finish times, observations, response, and any adverse event. 2 4
A simple BT note to practise: Date/time | indication | consent | component and unit number | compatibility/identity check | baseline and follow-up observations | start/finish | clinical response | reaction and action, if any.
Affective: communicate, respect, and speak up
Ask permission, explain the expected benefit and material risks, invite questions, and respect the patient’s decision. Do not dismiss concerns or pressure a patient. Tell the patient and attendants to alert the team promptly if there is fever or chills, itching or rash, breathlessness, chest/back pain, or sudden discomfort. Be meticulous with identity checks and report a suspected reaction immediately. Counselling is also explicitly addressed by the related NMC surgery competency SU3.3; practising it here helps connect knowledge with patient-centred care. 1 2
A patient-friendly explanation might sound like this: “We recommend this blood component because of your current condition. It may improve oxygen delivery or replace a specific blood component you need. We will check that it is the correct product for you and monitor you closely. Reactions can occur, from a mild fever or rash to a serious breathing or compatibility reaction; screened blood also carries a very small residual infection risk. Please tell us immediately if you feel unwell. Do you have questions before we proceed?” Tailor the discussion to the patient, the urgency, and local consent policy.
Complications: recognise the pattern; act first
Complications include acute haemolytic reactions, febrile non-haemolytic reactions, allergy or anaphylaxis, bacterial contamination/sepsis, TACO (transfusion-associated circulatory overload), TRALI (transfusion-related acute lung injury), and delayed haemolysis or alloimmunisation. Transfusion-transmitted infection is another risk, though donor screening reduces it. 2
If a reaction is suspected: stop the transfusion immediately; call for senior help and notify the blood bank; assess the patient and record vital signs; re-check the patient and unit identity; keep IV access open according to local protocol; and do not restart the same unit. Preserve the bag and giving set and send required samples/forms as directed by the hospital’s reaction protocol. Treat this as urgent—do not assume fever, breathlessness, or hypotension is a “minor” reaction. 2
A focused way to prepare for the written exam and viva
Make a one-page summary of component, purpose, key indication, and one inappropriate use. Practise a 60-second viva response on “safe steps in blood transfusion,” then rehearse the reaction-first-aid sequence until it is automatic. In skills teaching, ask to observe and practise identity checks, bedside explanation, monitoring, and documentation under supervision. A useful viva closer is: “The safest transfusion is the one with a clear indication, the correct component, a correct patient–unit match, close monitoring, and prompt action if a reaction is suspected.”
For undergraduate reading, use SRB’s Manual of Surgery and Harsh Mohan’s Textbook of Pathology for Indian MBBS-focused coverage, including a dedicated blood banking and transfusion chapter. Bailey & Love’s Short Practice of Surgery is a useful UK/international surgery reference; Robbins & Kumar Basic Pathology reinforces the pathology; and Sabiston Textbook of Surgery offers deeper US surgical reference material. For finals, prioritise your curriculum, class notes, and current institutional/NIB guidance rather than trying to read every reference cover to cover. 5 6 7 8 9
Exam takeaway: SU3.1 is more than memorising thresholds. Show that you can select a component for a reason, follow the safety sequence, communicate respectfully, and recognise when to stop and escalate.
References
[1] National Medical Commission: Competency Based Undergraduate Curriculum
[2] National Institute of Biologicals: Good Blood Transfusion Practices—Guidance for Rational Use of Blood (2022 )
[3] Carson et al. Red Blood Cell Transfusion: 2023 AABB International Guidelines
[4] NICE Guideline NG24: Blood Transfusion
[5] Jaypee: SRB’s Manual of Surgery
[6] Jaypee: Harsh Mohan’s Textbook of Pathology, 9th Edition
[7] Taylor & Francis: Bailey & Love’s Short Practice of Surgery, 28th Edition
[8] Elsevier: Robbins & Kumar Basic Pathology, 11th Edition
[9] Elsevier: Sabiston Textbook of Surgery, 22nd Edition