Turner syndrome can be diagnosed before birth if the mother has an amniocentesis. Prenatal ultrasound may also be used to diagnose due to visualization of malformations in the head or neck of the fetus.
After birth, Turner syndrome will be diagnosed by physical characteristics in girls or by delayed sexual development when they reach puberty. Finally, to confirm that you have this condition, it will be necessary to do a karyotype test to see the chromosomes.
Suggested for you: Turner Syndrome: Causes, Characteristics and Pregnancy.