When can ultrasound show fetal sex, and is the result certain?
Fetal sex may be visible during a mid-pregnancy scan if the position allows a clear view, but the result is not guaranteed. The main purpose is assessment of growth and anatomy. Blood tests vary in what they report; not every prenatal test provides fetal sex information.
Details
Why might the view be unclear?
Fetal position and image quality affect assessment. Tell the sonographer whether you want to know or prefer not to. An answer may not be possible at that visit, and a medical scan should not be prolonged simply to obtain a prediction.
What about a blood test?
The report depends on the test and screening programme. For example, the NHS non-invasive screening pathway does not provide fetal sex information. Ask what a test includes before paying rather than relying on a general accuracy claim.
If results differ
Discuss the reports with your maternity team. Conflicting predictions do not by themselves establish a genetic problem. An invasive procedure should not be sought merely out of curiosity. Knowing fetal sex does not replace an anatomy scan or assessment of fetal health.
Related reading: Why is ultrasound used in pregnancy, and when are extra scans needed?.