Growth scan at 35 weeks pregnant

It is a snapshot rather than an exact prediction of birth weight. Your clinician interprets the measurements with earlier scans, your health, and the reason the scan was requested.

The sonographer usually measures the baby's head, abdomen, and thigh bone. The ultrasound software combines these measurements into an estimated weight and plots growth against the expected range for the stage of pregnancy.

A single estimate has a margin of uncertainty. The pattern across scans often gives more context than one measurement alone. Fluid volume, movements seen during the examination, position, and Doppler blood-flow findings may affect whether routine care, another scan, or closer observation is advised.

Use the preparation instructions from your clinic, because bladder guidance can vary. Wear clothing that allows access to your abdomen and bring previous reports if they are held outside the clinic's system.

Afterwards, confirm who will discuss the report and when. If a measurement is outside the expected range, ask whether this may reflect normal variation, whether Doppler or fetal heart-rate monitoring is needed, and when the next review should happen.

Contact your maternity unit immediately if your baby's movements are reduced or different from their usual pattern. Also seek prompt maternity advice for vaginal bleeding, leaking fluid, regular painful contractions, severe headache, vision changes, marked swelling, strong pain under the ribs, fever, or feeling acutely unwell. A booked ultrasound is not a substitute for urgent assessment.

Ask how the estimated size compares with earlier measurements, whether fluid and blood flow look reassuring, what position the baby is in, and whether the result changes your appointments or birth plan. If repeat imaging is proposed, clarify what change the team is watching for.