[Doppler ultrasound of fetal blood vessels--optimizing the diagnostic value by a combined diagram].

The dopplersonographic data of 1926 pregnant women in the 3. trimester of pregnancy was used to evaluate a graphic system for the analysis of A/B-ratio in fetal vessels (pulsed wave duplex system; descending aorta and umbilical arteries). The basis of the newly developed combination diagram were dopplersonographic standard values (single cut off and pregnancy duration related percentiles). One of the results was the fact, that the combined measurement and analysis of both fetal vessels increased the positive predictive value compared to single measurements. The value of dopplersonographic examinations in the aorta was slightly better than those in the umbilical arteries. The combined diagram showed a marked improvement in graphicness, especially in follow-up cases, and a partial improvement in statistical values.