Determination of the progesterone receptor gene polymorphisms rs590688 C/G and rs500760 A/G was provided using PCR method. To investigate the genetical precursors of threatened abortion the next groups were included: 67 patients with threatened abortion and 93 healthy persons. These allelic variants have the significantly different at rs590688 study: C/C - 23,9%, C/G - 44,8%, G/G - 31,3%, and C/C - 27,2%, C/G - 58,7%, G/G - 14,1% in the control group (P<0,05 by x2-test). The allelic variants of the rs500760 polymorphism did not differ statistically in the study group A/A 53,7%, A/G - 40,3%, G/G - 6% in the control group A/A- 52,2%, A/G - 44,6%, G/G - 3,3% (P>0,05 by x2-test). Distribution of minor homozygote G/G polymorphism rs590688 progesterone receptor gene in patients with threatened abortion in our study almost in 10 times higher in comparing with women of Taiwanese Han population, who had idiopathic recurrent pregnancy loss. The obtained data indicate significant ethnic differences in PGR and show polymorphism rs590688 clinical significance.