S. Alsaedi et al., REFERENCE RANGES FOR SERUM CORTISOL AND 17-HYDROXYPROGESTERONE LEVELSIN PRETERM INFANTS, The Journal of pediatrics, 126(6), 1995, pp. 985-987
Reference ranges for cortisol and 17-hydroxyprogesterone were develope
d with sera from 39 healthy preterm infants less than 31 weeks of gest
ational age, collected weekly until 37 weeks of corrected age.