💧 Maintenance IV Fluids (Holliday-Segar)
Calculate maintenance IV fluid requirements with the Holliday-Segar method.
Clinical takeaway
For maintenance only — add deficits and ongoing losses.
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When to use
Maintenance fluids in children and adults (euvolaemic).
How it works
Daily: 100 mL/kg (first 10 kg) + 50 (next 10) + 20 (each kg > 20). Hourly (4-2-1): 4 + 2 + 1 mL/kg.
Key points
- For maintenance only — add deficits and ongoing losses.
- Use isotonic fluids; monitor sodium, especially in children.
- Reassess frequently in acute illness.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Weight | 24 kg |
|---|
→Maintenance rate64mL/h
- Daily volume：1580 mL/day
- Rule：Daily 100/50/20 mL/kg; hourly 4/2/1 mL/kg
Frequently asked questions
- What is Maintenance IV Fluids (Holliday-Segar)?
- Calculate maintenance IV fluid requirements with the Holliday-Segar method.
- How is Maintenance IV Fluids (Holliday-Segar) calculated? What is the core formula?
- Daily: 100 mL/kg (first 10 kg) + 50 (next 10) + 20 (each kg > 20). Hourly (4-2-1): 4 + 2 + 1 mL/kg.
- When is Maintenance IV Fluids (Holliday-Segar) used?
- Maintenance fluids in children and adults (euvolaemic).
- What are the key clinical points for Maintenance IV Fluids (Holliday-Segar)?
- For maintenance only — add deficits and ongoing losses. Use isotonic fluids; monitor sodium, especially in children. Reassess frequently in acute illness.
- What are the limits and cautions when using Maintenance IV Fluids (Holliday-Segar)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Maintenance IV Fluids (Holliday-Segar) calculated in practice? Can you show a worked example?
- Inputs: Weight 24 kg → Result: Maintenance rate 64 mL/h（Daily volume: 1580 mL/day, Rule: Daily 100/50/20 mL/kg; hourly 4/2/1 mL/kg）