Patent ID: 8759109

Claim:
A method of determining the gender of an unborn child comprising the steps of: (a) obtaining a body fluid from a pregnant female carrying the unborn child; (b) aging the body fluid at ambient temperature for at least about 2 days; (c) measuring levels of testosterone (T), estrogens (E), progesterone (P) and gonadotropins (G) in the body fluid; (d) calculating [E−(T+P+G)] as the difference between the level of estrogens (E) and the total levels of testosterone (T), progesterone (P) and gonadotropins (G); and (e) determining the gender of the unborn child to be male if the [E−(T+P+G)] value from step (d) ranges from about 300 to about 1,500, or to be female if the [E−(T+P+G)] value from step (d) ranges from about −10 to about −800.