The relationship between fetal umbilical venous pH (±2 SD) by cordocentesis and the fetal biophysical profile score

The correlation was linear, inverse, and very significant (R² 0.912; p <0.01).

SD: standard deviation.

Data from: Manning FA. Dynamic ultrasound-based fetal assessment: The fetal biophysical profile score. Clin Obstet Gynecol 1995; 38:26.