<prompt> Hasses formula used in pregnancy to?Identify sex ageIdentify fetal blood groupEstimate fetal ageIdentify fetal congenital malformations  <response>: Hasses formula If the crown-heel length is known then the intrauterine age of the fetus is calculated as:If CH length is up to 25 cm then IU age Square root of CH length If the CH length is 25 cm then IU age 15 of CH length 