Pediatric Quick-Reference

CRNA Study Suite · Weight, Airway, Fluids, Drugs
All Calculators Pediatric
Patient
NPO Guidelines (p. 1244)
IntakeHours NPO
Clear liquids2
Breast milk4
Formula / light meal6
Regular meal8
"2-4-6-8 Rule" (Belson & Furstein, 2023, p. 1244)
Quick-Reference Values
Est. Weight
--
kg
ETT Size
--
mm ID
ETT Depth
--
cm at lips
Maintenance
--
mL/hr
EBV
--
mL
Age Group
--
category
Calculation Breakdown
1. Weight Estimation
--
--
Estimated Weight = -- kg
Pediatric advanced life support weight estimate; formula varies by age band.
2. ETT Size
--
--
ETT Size = -- mm ID
(Belson & Furstein, 2023, p. 1250)
3. ETT Depth
Three rules: (Age/2) + 12 cm · 3 × ETT ID · "1-2-3-4 / 7-8-9-10" for neonates
--
ETT Depth ≈ -- cm
(Belson & Furstein, 2023, p. 1250)
4. Maintenance Fluids (4-2-1 Rule)
4 mL/kg/hr (first 10 kg) + 2 mL/kg/hr (next 10 kg) + 1 mL/kg/hr (>20 kg)
--
Maintenance = -- mL/hr
(Belson & Furstein, 2023, p. 1255)
5. Estimated Blood Volume
--
--
EBV = -- mL
(Belson & Furstein, 2023, p. 1256)
6. Common Drug Doses
--
(Belson & Furstein, 2023, pp. 1241, 1246, 1253)
References

Belson, P. J., & Furstein, J. S. (2023). Pediatric anesthesia. In S. Elisha, J. S. Heiner, & J. J. Nagelhout (Eds.), Nurse anesthesia (7th ed., pp. 1239-1259). Elsevier.

How this works

Airway sizing

For uncuffed tubes in children over 2 years, internal diameter in mm is (age + 16) / 4, with (age / 4) + 4 also documented; cuffed tube size is (age / 4) + 3 (Belson & Furstein, 2023, p. 1250). Insertion depth at the lip is about 3 times the tube's internal diameter in cm (Belson & Furstein, 2023, p. 1250).

Estimated blood volume by age

EBV varies by age: 90 to 100 mL/kg in preterm infants, 80 to 90 mL/kg in full term newborns, 75 to 80 mL/kg in infants 3 months to 3 years, 70 to 75 mL/kg in children 3 to 6 years, and 65 to 70 mL/kg in children over 6 years (Belson & Furstein, 2023, p. 1256).

References

Belson, P. J., & Furstein, J. S. (2023). Pediatric anesthesia. In Elisha, Heiner, & Nagelhout (Eds.), Nurse anesthesia (7th ed., pp. 1239-1259). Elsevier.