Pregnancy Scan Accuracy: Understanding Potential Discrepancies

It is possible that the scan results could be wrong about one week. Ultrasound scans are not always 100% accurate in determining the exact gestational age of a fetus, especially in the early stages of pregnancy. There are several factors that can affect the accuracy of ultrasound measurements, including the skill and experience of the sonographer, the quality of the ultrasound equipment, and the position of the fetus. In some cases, the gestational age may be off by a few days or even a week.

If you are concerned about the accuracy of your scan results, you should talk to your doctor. They can review your medical history and perform additional tests, such as a blood test or another ultrasound, to confirm the gestational age of your pregnancy.