01
Identify it
Foundation
Recognise the lesson’s key idea, the values that belong in the calculation and the unit the answer needs.
10 questions drawn from 24
One lesson · four quiz levels
Pediatric Maintenance Fluid Practice Questions (4-2-1 & 100-50-20)
Practise splitting a child's verified exercise weight into the first 10 kg, next 10 kg and kilograms above 20 kg, then calculate either the 4-2-1 hourly estimate or the 100-50-20 daily estimate without mixing the methods.
Pediatric maintenance fluid calculation practice
Quick review before you start
Use 4, 2 and 1 mL/kg/hr across the three weight bands for the hourly shortcut. Use 100, 50 and 20 mL/kg/day across the same bands for the daily Holliday-Segar method. Add the band results and keep hourly and daily units separate.
Formula
4-2-1 = hourly mL/hr; 100-50-20 = daily mL/day across first 10 kg, next 10 kg and kg above 20
The two methods are related but the rounded 4-2-1 hourly shortcut is not an exact 24-hour conversion of the 100-50-20 daily method.
Sample question
A fictional maintenance-fluid exercise gives a verified weight of 25 kg. What are the arithmetic estimates by each method?
4-2-1: 40 + 20 + 5 = 65 mL/hr; 100-50-20: 1000 + 500 + 100 = 1600 mL/day
Answer: 65 mL/hr and 1600 mL/day for the stated exercise
What these questions practise
- first-10-kg, next-10-kg and above-20-kg banding
- 4-2-1 hourly calculations in mL/hr
- 100-50-20 daily calculations in mL/day
- 10 kg and 20 kg boundary questions
- recognising that a maintenance estimate is not a complete patient-specific fluid prescription
Learn the skillWork through 4-2-1 and 100-50-20 calculations step by step.Read the formula guideReview how the two methods relate, why totals can differ and their clinical limits.Use the calculatorCalculate hourly and daily maintenance estimates from a verified weight within scope.Apply it clinicallyUse pediatric fluid calculations inside evolving paediatric scenarios.
Choose how you want to work
Guided practiceHints are available. Check each answer and see feedback before moving on.
Test yourselfNo hints or correctness feedback while you work. Submit the full set to see results.
02
Calculate it
Beginner
Use clearly stated orders and supplied information to complete straightforward calculations.
10 questions drawn from 24
03
Interpret it
Intermediate
Handle frequency, totals, conversions, order changes and realistic but relevant detail.
10 questions drawn from 24
04
Reason through it
Advanced
Reason through dense ward stories, changed orders, competing numbers and multi-part calculation chains.
10 questions drawn from 24
What the learning states mean
Learned means the lesson is complete. Practised means you have attempted questions. Secure requires a strong unassisted run. Mastered requires strong evidence again after time has passed. Review due means a previously stronger skill is ready for retrieval again.
These are MedMaths study states only. They do not certify clinical competence.