Questions
- When the last menstrual period, ovulation period, and ultrasound examination estimate different gestational ages, which value should be used for Down syndrome screening?
- When undergoing Down syndrome screening, should the age be calculated based on the age at pregnancy or the estimated age of delivery? How might the difference between the two affect the screening results?
Answers
- During Down syndrome screening, the consistent gestational age among the last menstrual period, ovulation period, and ultrasound examination should be used as a reference. Inconsistencies in gestational age can affect the screening results, so it is essential to ensure data consistency.
- The age for Down syndrome screening is calculated based on the age at pregnancy. The difference in age may affect the screening results, such as an increased risk of a positive test when the estimated age of delivery is older than the actual age at pregnancy. However, the specific impact should be determined by the physician based on individual circumstances.