High-yield map
Key points before the detail
- 01
Always identify which of the 5 Rs you are treating before choosing a bag.
- 02
General NICE adult resuscitation: crystalloid sodium 130–154 mmol/L, 500 mL over less than 15 minutes, then reassess; sepsis NG253 uses smaller 250 mL boluses.
- 03
Fluid responsiveness does not automatically mean fluid is required.
- 04
For adults without active bleeding who need red cells, NICE supports restrictive thresholds in most settings and single-unit transfusion followed by clinical and haemoglobin reassessment.
The 5 Rs
| R | Question |
|---|---|
| Resuscitation | Is organ perfusion inadequate because effective circulating volume is low? |
| Routine maintenance | What daily water and electrolytes are needed while oral/enteral intake is inadequate? |
| Replacement | What measured or estimated abnormal losses must be replaced? |
| Redistribution | Is fluid retained or shifted into the wrong compartment? |
| Reassessment | Has therapy worked, caused harm or become unnecessary? |
General adult resuscitation versus sepsis
For adult IV fluid resuscitation outside a more specific pathway, NICE CG174 recommends a crystalloid containing sodium 130–154 mmol/L, usually 500 mL over less than 15 minutes, followed by immediate reassessment. In suspected adult sepsis, NICE NG253 now specifies an initial 250 mL isotonic crystalloid bolus with reassessment and further 250 mL boluses only if needed. These recommendations are not contradictory: they apply to different clinical pathways.
Choose fluid by purpose
| Fluid | Useful concept | Important caution |
|---|---|---|
| Balanced isotonic crystalloid | Common resuscitation/replacement option | Composition varies; still produces extracellular expansion and can cause overload if overused. |
| 0.9% sodium chloride | Useful in selected chloride-rich loss/endocrine/neuro contexts | Large volumes can produce hyperchloraemia and metabolic acidosis; NICE recommends monitoring chloride with high-chloride fluids. |
| 5% glucose | Provides water after glucose metabolism; useful in selected maintenance/water-replacement contexts | Not a resuscitation fluid and can contribute to hyponatraemia/hyperglycaemia. |
| Blood components | Replace oxygen-carrying capacity and haemostatic deficits when indicated | Use transfusion guidance/local major-haemorrhage pathways rather than treating them as generic volume expanders. |
Red-cell transfusion outside major haemorrhage
NICE NG24, last updated in February 2026, recommends restrictive red-cell thresholds for most patients who do not have major haemorrhage, acute coronary syndrome or a need for regular transfusions for chronic anaemia. It suggests considering a threshold of 70 g/L with a post-transfusion target of 70–90 g/L in that general group. For adults without active bleeding, transfuse one unit at a time and reassess clinically and with haemoglobin before further units.
Coagulation tests and components
PT/INR, APTT, platelet count and fibrinogen sample different parts of haemostasis and must be interpreted with the clinical situation, medication and bleeding pattern. Plasma, platelets, cryoprecipitate/fibrinogen and prothrombin-complex products have specific indications; thresholds and reversal regimens should be taken from current transfusion/haematology guidance and local protocols rather than memorised as universal numbers.
- A normal platelet count does not prove normal platelet function.
- A prolonged PT or APTT is not by itself an indication for plasma in a non-bleeding patient.
- In major bleeding, hypothermia, acidosis, fibrinogen depletion and dilution can worsen coagulopathy and should be actively considered.
Active recall
Close the notes and answer these
Try each question from memory before revealing the answer. These public prompts are a small preview of the integrated retrieval system inside SurgAtlas.
01What are the NICE 5 Rs of IV fluid therapy?
Resuscitation, routine maintenance, replacement, redistribution and reassessment.
02What general adult resuscitation bolus does NICE CG174 describe?
A crystalloid containing sodium 130–154 mmol/L, usually 500 mL over less than 15 minutes, then immediate reassessment.
03What red-cell strategy does NICE recommend for adults without active bleeding when transfusion is indicated?
Use a single-unit red-cell transfusion and reassess clinically and with haemoglobin before giving more.
Sources & editorial basis
References & editorial basis
- SurgAtlas production chapter — Fluids, Blood and Coagulation. Primary SurgAtlas source. Guideline-dependent statements in this public lesson were separately checked against the current authoritative sources listed below.
- NICE CG174 — Intravenous fluid therapy in adults in hospital. Current adult IV-fluid assessment, 5 Rs, resuscitation and monitoring recommendations. Source ↗
- NICE NG24 — Blood transfusion. Current restrictive red-cell thresholds and single-unit strategy; last updated 26 February 2026. Source ↗
This lesson is derived from the corresponding SurgAtlas production teaching material. Where the source makes current management or guideline claims, the public lesson uses the cited contemporary guidance. It is written for education and examination preparation, not as patient-specific clinical advice.
Editorial details
Medical Doctor (MD) · MRCS Part A · Physician · Surgical Educator
SurgAtlas is an educational resource. For patient care, verify current national guidance, local antimicrobial and transfusion policies, specialty pathways and individual patient factors.
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