Antiphospholipid syndrome in pregnancy: what is the plan?

By trimester

Weeks 1–13

1st trimester

Before or early in pregnancy, clarify the clinical history, antibody profile, and agreed medicine plan.

Weeks 14–27

2nd trimester

During prenatal follow-up, keep blood-pressure, laboratory, and fetal assessment appointments.

Weeks 28–birth

3rd trimester

Before birth, document medicine timing, anesthesia communication, and the postpartum follow-up plan.

What does the evidence show for antiphospholipid syndrome?

• APS is an autoimmune condition associated with abnormal blood clots and certain pregnancy complications. These include preeclampsia, placental problems, early birth, and pregnancy loss. An association describes increased risk across groups and does not mean that a complication is inevitable in an individual pregnancy. 1
• EULAR guidance distinguishes an antibody finding from APS with a relevant clinical history. Antibody type, persistence, and whether several tests are positive affect the assessment. Bring original laboratory reports and records of previous clots or pregnancy complications so the specialist can interpret the full picture. 2
• Pregnancy regimens differ for prior obstetric APS and for APS with a previous thrombosis. The guidance discusses clinician-prescribed low-dose aspirin and heparin in selected circumstances. The dose, timing, delivery interruption, and postpartum plan should be specific to the indication, not copied from another patient. 2
• Blood-pressure monitoring and review of preeclampsia symptoms remain part of obstetric follow-up. Ask what findings would lead to additional laboratory tests or fetal assessment. A medicine plan does not remove the need to report new headache, vision changes, or upper abdominal pain. 3
• Chest pain, trouble breathing, fainting, or a painful swollen limb requires urgent assessment. Serious maternal warning signs should not wait for a routine anticoagulation appointment. Tell clinicians about APS, pregnancy, and the exact medicines and last doses taken. 4

Questions to discuss with your care team

When should I call my provider about antiphospholipid syndrome?

Chest pain, sudden breathing difficulty, fainting, or a painful swollen limb needs urgent assessment.,Severe headache, new vision changes, or upper abdominal pain should be reported promptly to the pregnancy team.,Significant bleeding while using anticoagulants needs immediate advice; do not make unsupported dose changes. When in doubt, call your obstetric team the same day. Early input almost always beats waiting, and the on-call line exists exactly for this.