The use of plasma creatinine concentration for estimating glomerular filtration rate in infants, children, and adolescents

Pediatr Clin North Am. 1987 Jun;34(3):571-90. doi: 10.1016/s0031-3955(16)36251-4.


The formula GFR = kL/Pcr can be used to estimate GFR in infants, children, and adolescents who have grossly normal body habitus and are in steady-state condition. GFR is expressed in ml/min per 1.73 m2 BSA, L represents body length in cm, Pcr represents plasma creatinine concentration in mg per dl and k is a constant of proportionality that reflects the relationship between urinary creatinine excretion and units of body size. The value of k varies as a function of age and sex being 0.33 in preterm infants, 0.45 in full-term infants, 0.55 in children and adolescent girls, and 0.70 in adolescent boys. The advantages of rapid determination, reasonable accuracy, and the avoidance of urine collection justify the use of this formula in pediatric patients.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adolescent
  • Adult
  • Age Factors
  • Blood Chemical Analysis / methods
  • Body Constitution
  • Body Height
  • Child
  • Child, Preschool
  • Creatinine / blood*
  • Creatinine / urine
  • Female
  • Gestational Age
  • Glomerular Filtration Rate*
  • Humans
  • Infant
  • Infant, Newborn
  • Infant, Premature
  • Male
  • Models, Biological
  • Reference Values
  • Sex Factors


  • Creatinine