What do systematic reviews say?

Heparin plus aspirin vs aspirin

Heparin plus aspirin may leads to lower pregnancy loss compared with aspirin (low certainty).

• Aspirin or heparin or both for improving pregnancy outcomes in women with persistent antiphospholipid antibodies and… 2020 · Cochrane Headline outcomes only
  RR 0.48 [0.32, 0.71]
  5 studies · 1295 participants
  Low