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What do BPD, HC, AC and FL mean on my scan report?

BPD is the width of the head, HC the head circumference, AC the circumference of the tummy and FL the length of the thigh bone. Together they're used to follow growth and estimate the baby's weight.

What percentile is typical for a baby on ultrasound?

Anywhere from the 10th to the 90th percentile is the typical range, where 8 in 10 babies measure. The 50th is the middle, not a target.

My baby's AC is below the 10th percentile. What happens next?

Often a follow-up scan to see how your baby grows over time. Many babies who measure there are simply small. Your team may also check the estimated weight, the fluid and the blood flow. Call now if your baby moves less than usual.

What is the HC/AC ratio and what does a high ratio mean?

It compares the head with the tummy. It falls from about 1.19 at 20 weeks to just under 1 at term. Above the 90th percentile, the head measures large compared with the tummy, and sonographers look at it together with weight, fluid and blood flow.

Why do my percentiles differ from my report?

Clinics use different charts, and the same measurement can sit on a different percentile on each. Your report uses your clinic's own chart, and that's the one your team goes by.

Can I see my baby's length on a scan?

Not after about 14 weeks. The crown–rump length is measured in early pregnancy. Later the baby is too curled up, so scans measure the head, tummy and thigh bone. Length is measured after birth.

What is a typical fetal length (CRL) by week?

In early pregnancy the crown–rump length is about 10 mm at 7 weeks, 16 mm at 8 weeks, 33 mm at 10 weeks, 56 mm at 12 weeks and 84 mm at about 14 weeks. Enter your CRL in the early scan mode to see the week it matches.

How accurate is dating by crown–rump length?

Measured between 10 and 14 weeks, it dates a pregnancy to within about 5 days. Before 10 weeks it's less precise.

My scan and my period dates disagree. Which due date is used?

Usually the scan's, when the difference is more than a few days. A due date set by an early scan isn't changed by later scans.

Is my data saved?

No. Everything is worked out in your browser and nothing is stored or sent.