How accurate are dating scans at 16 weeks
After your baby's heartbeat is checked, the main purpose of this scan is to check your baby's anatomy for normality.
A thorough examination of your baby's brain, heart, spine, kidneys, organs and limbs will be undertaken.
At the second trimester scan they check that your baby is developing normally, they assess the gestational age by measuring the crown-rump length and will also look for any major problems.
This is a routine ultrasound examination performed at 18 to 20 weeks of gestation.
As a rough rule of thumb, the CRL 6.5 = Menstrual Age in Weeks.