When is antenatal steroid injection recommended for premature rupture of membranes?

Premature rupture of membranes means the fluid-filled sac around the baby breaks before labour begins. The timing of an injection depends on pregnancy stage, signs of labour, infection, bleeding, fetal wellbeing, and how soon birth may occur. Steroids cross the placenta and help prepare a baby’s lungs and other organs for possible early birth; they do not repair the membranes or treat an infection.

If you think fluid is leaking, use a pad, note its colour and smell, and contact your maternity unit immediately. Avoid inserting anything into the vagina until assessed. The team may check your temperature, pulse, abdomen, fetal heart rate, and the fluid, then discuss steroids, antibiotics, observation, or delivery. Read more about [Antenatal Steroid Injection](/treatments/pregnancy-and-birth-care/antenatal-corticosteroid-injection/).

Seek urgent maternity assessment for fever or chills, feeling unwell, foul-smelling or green fluid, vaginal bleeding, worsening abdominal pain, regular contractions, or reduced fetal movements. These can signal infection, labour, or a concern requiring prompt care.

Ask how likely early birth seems, why steroids are advised now, what monitoring is planned, and which symptoms should trigger an immediate call.