New trials are being carried out with drugs to reduce miscarriage.

Repeat or "recurrent" miscarriage is defined as at least three consecutive spontaneous pregnancy losses before 20 weeks of gestation. While higher maternal age, smoking, drinking, and other factors can raise the risk of miscarriage, oftentimes the cause is unknown.

The trials on 52 women who were treated with prednisone, progesterone, aspirin and folate had a considerably higher birth rate than untreated subjects.

Read about Miscarriage - Drug trials

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