Management of Sickle Cell Disease in Pregnancy
Preconception Care
Women with sickle cell disease (SCD) should be seen preconceptually by a sickle specialist for optimisation and screening for end-organ damage: echocardiography for pulmonary hypertension (tricuspid regurgitant jet velocity >2.5 m/s indicates high risk), blood pressure/urinalysis, annual renal and liver function tests, retinal screening, and iron overload assessment. Partner haemoglobinopathy testing should be offered. Hydroxycarbamide must be stopped at least 3 months before conception (teratogenic in animals); ACE inhibitors/ARBs should also be stopped preconceptually.
Antenatal Management
- Folic acid 5 mg daily, both preconceptually and throughout pregnancy, to cover increased folate demand from chronic haemolysis and to reduce neural tube defect risk.
- Penicillin prophylaxis (or erythromycin if penicillin-allergic) should be continued throughout pregnancy, as SCD patients are functionally hyposplenic and at risk from encapsulated organisms (Neisseria meningitidis, Streptococcus pneumoniae, Haemophilus influenzae). Pneumococcal vaccine every 5 years; annual influenza vaccine.
- Low-dose aspirin 75 mg from 12 weeks to reduce pre-eclampsia risk.
- Care is multidisciplinary (obstetrician, midwife, haematologist), with blood pressure and urinalysis at every visit, monthly MSU, and serial fetal growth scans every 4 weeks from 24 weeks (growth restriction risk).
- Routine prophylactic blood transfusion is not recommended (Grade A). Transfusion (top-up or exchange) is reserved for specific indications: acute anaemia (Hb <6 g/dl or fall >2 g/dl from baseline), acute chest syndrome (ACS) or acute stroke (both require exchange transfusion), twin pregnancy, or women already on a pre-pregnancy transfusion regimen. Blood must be matched for extended phenotype (Rh C, D, E and Kell) and be CMV-negative.
- Women admitted to hospital should receive prophylactic LMWH thromboprophylaxis.
Management of Acute Painful Crisis
Sickle crisis must be excluded urgently in any unwell pregnant woman with SCD. Initial analgesia within 30 minutes of arrival, effective analgesia within 1 hour, following the WHO analgesic ladder: paracetamol, then NSAIDs (only between 12–28 weeks), then opioids. Pethidine must be avoided due to seizure risk (normeperidine accumulation); morphine/diamorphine are preferred. Fluids at least 60 ml/kg/24h, oxygen if saturation falls below baseline or <95%, and monitoring of pain, sedation, respiratory rate and oxygen saturation every 2 hours. Thromboprophylaxis (LMWH) is given during admission. Acute chest syndrome — the leading cause of death in SCD — requires antibiotics, oxygen, and top-up or exchange transfusion depending on severity and hypoxia.
Delivery Considerations
- Elective birth (induction of labour or elective caesarean if indicated) is recommended after 38+0 weeks for a normally growing fetus; SCD alone is not a contraindication to vaginal birth, including VBAC.
- Continuous intrapartum electronic fetal heart rate monitoring is recommended given increased risk of fetal distress, abruption, and stillbirth.
- Keep the woman warm, well hydrated, and avoid prolonged/dehydrating labour (crisis risk rises after 12 hours); maintain oxygen saturation ≥94% with pulse oximetry and arterial blood gas if needed.
- Regional anaesthesia is recommended for caesarean section; pethidine remains contraindicated; anaesthetic assessment should occur in the third trimester.
- Postnatally: maintain oxygenation/hydration, continue LMWH for 7 days after vaginal birth or 6 weeks after caesarean, and offer early neonatal SCD testing where the baby is at risk.
High-Yield Exam Points
- Folic acid dose in SCD pregnancy is 5 mg daily (higher than the standard 400 microgram dose).
- Penicillin (or erythromycin) prophylaxis continues throughout pregnancy due to functional hyposplenism.
- Pethidine is contraindicated in SCD crisis — risk of normeperidine-induced seizures.
- Routine prophylactic transfusion is NOT recommended (Grade A); transfusion is indicated for acute anaemia, ACS, stroke, or twin pregnancy.
- ACS requires exchange transfusion in severe/hypoxic cases; top-up transfusion may suffice if Hb is falling but oxygenation preserved.
- Elective birth timing target is 38–40 weeks; SCD is not itself an indication for caesarean section.
Source: RCOG Green-top Guideline No. 61 (Archived 3 May 2023 — successor is the British Society for Haematology guideline "Management of sickle cell disease in pregnancy" (Oteng-Ntim et al., *Br J Haematol* 2021); much of the RCOG content below remains clinically relevant and consistent with the BSH update) (July 2011 (first edition; RCOG review was due 2014 but the guideline was archived rather than revised))
Read the original on rcog.org.uk
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