Paediatric normal values and guesstimates

Physiological Data
Approx. values for vital signs
Age (yrs)	Resp Rate	HeartRate	Sys BP
<1	30 - 40	110 - 160	70-90
2 - 5	25 - 30	95 - 140	80 - 100
5 - 12	20 - 25	80 - 120	90 - 110
> 12	15 - 20	60 - 100	100 - 120

Weight (kg) = 3(age) + 7

Tidal volume = 7-10 ml/kg

Blood vol = 100 ml/kg in neonates, 80ml/kg by one year of age

Systolic BP = 80 + (Age x 2)

Body surface area (m²) = (( height in cm X weight in cm ) / 3600) ^-2

Estimate: Tube diameter = diameter child’s little finger or nostril

Internal diameter (mm) = (age/4)+4 in a child over one year

Length (cm) = (age/2)+12 for an oral tube

Full term neonates usually require a tube diam 3.0 - 3.5mm

Age	Gastric Tube	Chest tube	Urinary Catheter
Premie newborn	8 Fr	10 - 14 Fr	5 fr feeding
Newborn - 6mo	8 - 10 Fr	12 - 18 Fr	5 - 8 Fr feeding
6 mo - 1 year	10 Fr	14 - 20 Fr	8 Fr
1 - 3 years	10 - 12 Fr	14 - 24 fr	8 10 Fr

These are rough guides only. Use a tube that seems appropriate, and use the largest practicable