Prognosis
The prognosis of a threatened miscarriage is best assessed with an ultrasound scan.
Adverse prognostic factors include:
- large empty gestational sac
- discrepancy between gestational age and crown to rump length
- fetal bradycardia or absence of fetal heart activity at presentation
- advanced maternal age
- history of recurrent pregnancy loss
- maternal serum progesterone < 45 nmol/l or low maternal serum hCG or inhibin A (1).
Fetal heart activity and the absence of above mentioned factors are considered as favourable prognostic factors (1).
Approximately 75% of pregnancies continue.
Reference:
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