Is a lower SD value better at 24 weeks of pregnancy?
Sep 25, 2024
Source: Cainiu Health
Dr. Zhang Lu
Introduction
The S/D ratio refers to the ratio of peak systolic velocity (S) to end-diastolic velocity (D) in the umbilical artery. At 24 weeks of gestation, the S/D ratio typically falls within a relatively stable range, generally between 2.5 and 5.5. A lower S/D ratio is not necessarily better; an abnormally low value may indicate reduced peripheral vascular resistance in the fetus. It is preferable for the S/D ratio to remain within the normal range.
At 24 weeks of gestation, the S/D ratio is not necessarily better when lower; it is preferable for it to remain within the normal range. Specific analysis is as follows:
The S/D ratio refers to the ratio of peak systolic blood flow velocity (S) to end-diastolic blood flow velocity (D) in the umbilical artery. At 24 weeks of pregnancy, the S/D ratio typically remains within a relatively stable range, generally between 2.5 and 5.5. A lower S/D ratio is not always better, as an abnormally low value may indicate reduced peripheral vascular resistance in the fetus. Each fetus has individual differences in growth rate and size. As long as ultrasound examinations show normal fetal structural development, appropriate amniotic fluid volume, good placental function, and the S/D ratio within the normal range, the condition is considered normal. However, if the S/D ratio is significantly below the normal range, it may suggest intrauterine growth restriction of the fetus, which requires timely medical intervention.
If a pregnant woman experiences any discomfort symptoms, she should seek medical attention promptly and receive symptomatic treatment under the guidance of a qualified physician to ensure healthy fetal growth and development.
