TABLE 1.

Heparins prevent pregnancy loss and inhibit complement activation

	Anticoagulation	Prevention of pregnancy loss	Complement inhibition
UFH (10 U)	−	+	+
UFH (20 U)	+	+	+
LMWH	+	+	+
Fondaparinux	+	−	−
Hirudin	+	−	−

LMWH, low molecular weight heparin; UFH, unfractionated heparin.