Intrauterine growth restriction(IUGR): Causes & Work-ups
The IUGR and the SGA are interrelated and actually mixed, but not synonymous. IUGR is defined as the case where the growth of the fetus is inhibited by various causes and is defined as the case where the expected weight of the fetus according to the gestational age is less than the 10th percentile. On the other hand, SGA means that the birth weight of newborn when birth is below the 10th percentile of body weight distribution according to gestational age. Therefore, even if IUGR was present, it may not be the SGA depending on the timing and degree of its occurrence. IUGR is observed in 3-10% of total pregnancies and in 20% of still babies. Placenta dysfunction is the most common cause, with congenital infection (10%), chromosomal abnormalities and other genetic diseases accounting for 5-15%. Factors related to IUGR can be divided into maternal related factors, placental factors, and fetal factors. Maternal side factors include experience with drug use, malnutrition, hypoxia, hypertensi...