Low molecular weight heparin in prophylactic doses should not interfere with the body’s ability to clot at the site of injury. A clotting screen should be normal, and this indicates no increased risk of epidural haematoma. In controlled studies at least 10,000 women on prophylactic low molecular weight heparin have been given epidural/spinal anaesthesia without complications. Some units do have rules about timing e.g. epidurals may not be given if it is less than 12 hours since the last injection. The evidence for this is poor. It would be worth you arranging to see an anaesthetist about this so that you can establish the policy of your local team with regard to this issue.