Sex determination

Sex determination may refer to:

Development of an organism's sex

 * A sex-determination system, a biological system that directs the development of sexual characteristics in an organism
 * Sexual differentiation in humans
 * Sexual differentiation, the development of sexual characteristics in sexually reproducing organisms in general

Discernment of an organism's sex

 * Determination of sex, the scientific or medical discernment of an infant's biological sex at birth
 * Prenatal sex discernment, prenatal testing for the discernment of the fetal sex in humans
 * Sex assignment, a colloquial term for the discernment of an infant's sex at birth
 * Sexing, used by biologists and agricultural workers to discern the sex of livestock or other animals