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Clinical Notice:Calculations must be re-checked and should not be used alone to guide patient care, nor should they substitute for professional clinical judgment. OpiCalc is an auxiliary reference tool for qualified healthcare professionals.

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Recent Journal Updates

CancerApr 28, 2026
Drug development trajectory of anticancer drugs after initial pediatric‐eligible trials

Clinical Context

Matched clinical terms: pediatric, pediatric — may affect guidance relevant to Pediatric Maintenance Fluid (Holliday-Segar).

WHO NewsApr 22, 2026
WHO certifies the Bahamas for eliminating mother-to-child transmission of HIV

Clinical Context

Matched clinical terms: pediatric, pediatric — may affect guidance relevant to Pediatric Maintenance Fluid (Holliday-Segar).

Intensive Care MedicineApr 20, 2026
Implementation of a kidney protection strategy to prevent acute kidney injury after major surgery in high-risk patients identified by biomarkers: a systematic review and individual participant data meta-analysis of randomized controlled trials

Clinical Context

Matched clinical terms: fluid, fluid — may affect guidance relevant to Pediatric Maintenance Fluid (Holliday-Segar).

Pediatric Maintenance Fluid

4-2-1 RuleHolliday-Segar Fluid Calculation

Input Data

kg

Hydration Baseline

Calculate hourly maintenance fluid requirements for pediatric patients based on current weight.

Guidelines & Evidence

Verified

Last Review: 2026

4-2-1 Rule

Holliday-Segar (4-2-1 Rule)
First 10 kg:4 mL/kg/hour.
Next 10 kg (10–20 kg):2 mL/kg/hour.
Each additional kg (> 20 kg):1 mL/kg/hour.
Example (25 kg child)
Calculation:(10×4) + (10×2) + (5×1) = 40 + 20 + 5 = 65 mL/hr.

Related Scores in Practice

In clinical practice, this assessment is frequently evaluated alongside other validated measures. Depending on the patient's presentation and specific diagnostic requirements, you may also need to utilize the Pediatric Dehydration Fluid Deficit or the Pediatric Fluid Resuscitation to formulate a comprehensive care plan.

Last Comprehensive Review: 2026

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