Maternal isoimmunisation

Maternal isoimmunisation — referral criteria for Obstetrics services.

Eligibility

At least one must be met for the patient to be eligible for referral.

Clinically suspected or confirmed maternal isoimmunisation with initial primary-care work-up completed

Routine referral criteria

Determine Category 2 or 3 urgency.

Previously affected baby

Abnormal ultrasound finding — high fetal middle cerebral arterial (MCA) peak systolic velocity (PSV) with greater than 1.5 multiple of median (MoMs)

Abnormal ultrasound finding — fetal hydrops

Antibody titre greater than or equal to 1:32 of any intermediate or high-risk antibody

Any positive anti-K antibody

Usually managed in primary care