<prompt> A newborn has weight 2000 g and length 50 cm. What is the Ponderal index of this child?11.62.22.6  <response>: Ponderal index PI, which is calculated using the following formula: PI Bihweight x 1000crown-heel length3 Therefore, PI 20001000503 1.6 A normal index at 28 weeks is 1.8. This value increases by 0.2 every 4 weeks to reach 2.4 at 40 weeks. Asymmetric IUGR infants will have a low ponderal index ie, they will be long, lightweight infants, whereas small normal infants will have a normal ponderal index. Ref: Rahimian J., Varner M.W. 2007. Chapter 16. Dispropoionate Fetal Growth. In A.H. DeCherney, L. Nathan Eds, CURRENT Diagnosis Treatment Obstetrics Gynecology, 10e. 