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. 2005 Apr 20;2005(2):CD002859. doi: 10.1002/14651858.CD002859.pub2

Rai 1997.

Methods Single centre, non‐blinded, non‐placebo controlled RCT.
Participants Inclusion criteria: 
 1) >/= 3 consecutive miscarriages. 
 2) +ve APL antibody on at least 2 occasions > 8 weeks apart determined by ACL IgG > 5 GPL units or ACL IGM > 3 MPL units or a positive LA (APTT, dRVVT ratio>/= 1.1 confirmed by platelet neutralisation ‐ decrease of >/= 10% of ratio). 
 Exclusion criteria: 
 1) Previous thromboembolism. 
 2) SLE. 
 3) Uterine abnormality on ultrasound. 
 4) Hypersecretion of luteinising hormone. 
 5) Multiple pregnancy. 
 6) Abnormal karyotype of either partner.
Interventions Calcium heparin 5000 units twice daily sc plus aspirin 75 mg/day versus aspirin 75 mg/day alone.
Outcomes Live birth, gestational age and weight, congenital abnormality, admission to neonatal ICU, bone mineral densitometry and maternal morbidity.
Notes Aspirin commenced in all when +ve pregnancy test. 
 Randomisation occurred when fetal heart activity noted on ultrasound (6.6 weeks in aspirin group and 6.7 weeks in aspirin/heparin group). Heparin commenced in heparin only group after randomisation.
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment? Low risk A ‐ Adequate