Chong et al developed a simple equation for predicting the ideal needle insertion length for performing a lumbar puncture in a pediatric patient. The authors are from the University of Malaya in Kuala Lumpur.

This is similar to the equation of Abe et al.


Patient selection: 0.5 to 15 years, body weight from 7 to 63 kilograms, height from 70 to 162 cm



(1) height in centimeters

(2) weight in kilograms


ideal depth of needle insertion in cm =

= (10 * (weight) / (height)) + 1



• The regression coefficient is 0.77

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