IRCT201012035294N.

Trial name or title	Clinical trial comparison of progesterone suppository and placebo on the concentration of cervical inflammatory cytokines in patients at risk of miscarriage
Methods	Randomised, parallel, double‐blinded study
Participants	All women who are 20 weeks pregnant and who have been referred for pain or increased cervical secretion and spotting are included in the study.
Interventions	Intervention group: progesterone suppository 400 mg twice/d for 1 week Control group: placebo
Outcomes	Primary miscarriage rate Secondary measurement of cervical inflammatory cytokines
Starting date	June 2006
Contact information	Dr Sedigheh Hanustah Zadeh Valiasr Hospital, Tehran University of Medical Sciences Iran, Tehran 00982166581617 hantoushzadeh@tums.ac.ir
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