Fetal Well Being. The nst is a test for fetal well being. It monitors fetal heart rate. The beat-to-beat variability tells you the following: a) high bbv is good b) low or absent bbv may indicate distress and may need further testing or delivery.
Ask him/her. There are several indications for fetal surveillance (non-stress testing and amniotic fluid index or afi vs. Bpp or full biophysical profile) once or twice weekly after 32 weeks in general. Only your doctor can explain your condition on the basis of your history and examination, however fetal surveillance in general has helped decrease the perinatal fetal loss rate in the us despite comorbidities.