Fetal sex can be easily seen by the US Patented technique developed by Dr John D Stephens. By correlating the ultrasound sex with the chromosomes obtained from a genetic amniocentesis he achieved 100% accuracy in over 10,000 cases. This led to the development of FASAsm recognized by his USPatent 4,986,274 FETAL ANATOMIC SEX ASSIGNMENT BY ULTRASOUND IN EARLY PREGNANCY 12-14 weeks of gestation granted to the inventor John D Stephens  Jan 22nd 1991.

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