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The C*STEROID Trial: Corticosteroids before planned caesarean section from 35+0 to 39+6 weeks of pregnancy.

The C*STEROID Trial. Antenatal corticosteroids prior to planned caesarean section delivery from 35+0 to 39+6 weeks gestation; a randomised controlled trial assessing the effects on neonatal respiratory morbidity and glycaemic control.

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
ANZCTR
Registry ID
ACTRN12620000914965
Acronym
The C*STEROID Trial
Enrollment
1334
Registered
2020-09-16
Start date
2020-10-07
Completion date
Unknown
Last updated
2026-04-27

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Brief summary

Birth by planned caesarean section poses some risk to babies, in particular, the need for admission to the neonatal unit for breathing support. Corticosteroid injections given to mothers expecting a preterm birth reduce neonatal respiratory morbidity but is not known if corticosteroids before a planned caesarean section at or near term have the same effect. Limited research suggests that as well as benefits on babies’ breathing these injections may lower babies’ blood sugar levels and so possibly cause harm. The C*STEROID Trial is a multi-centre, placebo-controlled, randomised trial to assess the effects of corticosteroids given to mothers before a planned caesarean section at or near term on neonatal and childhood health.

Interventions

Two doses of 11.4mg betamethasone by intramuscular injection into the thigh, arm or buttock, 24 hours apart given within seven days of planned caesarean section. Adherence will be assessed by review of the drug accountability log and/or medication chart.

Sponsors

The University of Auckland
Lead SponsorUniversity

Study design

Allocation
Randomised controlled trial
Intervention model
Parallel
Primary purpose
Prevention
Masking
Blinded (masking used) (Subject, Caregiver, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender
All
Healthy volunteers
No

Inclusion criteria

1. Women for whom caesarean section is planned pre-labour at 35+0 to 39+6 weeks gestation. 2. >24 hours and <7 days before planned birth. 3. Singleton or twin pregnancy with a live fetus.

Exclusion criteria

1. Diabetes: pre-existing or gestational. 2. Major fetal abnormality. 3. Prior corticosteroid use in this pregnancy (intramuscular corticosteroid use for fetal lung maturity). 4. Prior enrolment in the C*STEROID Feasibility Study or C*STEROID Trial, in a previous pregnancy.

Outcome results

None listed

Source: ANZCTR · Data processed: May 1, 2026