A grade 3 placenta, for example, is normal at 40 weeks. But if too many calcifications are seen early in pregnancy, it can indicate that the placenta is aging too rapidly. This can happen in high blood pressure and diabetes, for example. If the placenta is found to have advanced calcifications early in pregnancy, the baby will be evaluated for growth at intervals to be sure he is getting the nutrients that he needs. In addition, the amniotic fluid level is checked frequently to make sure there is enough of it, because decreased fluid could mean the placenta is not providing enough nutrients to the fetus.
Grade 1 – (minor) the placenta is mainly in the upper part of the womb, but some extends to the lower part.
Grade 2 – (marginal) the placenta reaches the cervix, but doesn't cover it.
Grade 3 – (major) the placenta partially covers the cervix.
Grade 4 – (major) the placenta completely covers the cervix (most serious type of placenta praevia).
Anterior and upper segment means the baby is above the birth position but still not attached to the cervix...