When is the combined test performed during pregnancy?

The combined test during pregnancy is performed between 11 and 14 weeks of gestation. This timing is crucial because it allows for accurate assessment of the risks of chromosomal abnormalities, particularly Down syndrome, in the developing fetus.

The combined test includes a blood test that measures specific markers in the mother’s blood and an ultrasound examination known as a nuchal translucency scan. This scan measures the fluid at the back of the baby's neck, which is an important indicator used to calculate the risk of chromosomal anomalies. Conducting the test within this specific window ensures that the measurements obtained are most reliable, as the nuchal translucency can vary at different stages of the pregnancy.

Performing the test outside of this timeframe may lead to less accurate results and could miss the optimal period for detecting potential issues. Hence, the significance of the 11 to 14-week period is critical for informed decision-making regarding further testing and management during the pregnancy.