8/24 had mid-luteal progesterone levels below 30 nmol/L (9.43 ng/ml). <a href="http://www.ncbi.nlm.nih.gov/pubmed/1119210291%">http://www.ncbi.nlm.nih.gov/pubmed/1119210291%</a> of pregnancies with progesterone lower than 15 ng/ml will end in miscarriagePregnant women between 5 and 13 weeks' gestational age were included as Group I who resulted in miscarriage including missed miscarriage, incomplete miscarriage, complete miscarriage and inevitable miscarria