An amniotic fluid index of 67 millimeters in 37 weeks of pregnancy is not normal and is below the normal range, generally known as oligohydramnios. The amniotic fluid index at 37 weeks of pregnancy should be between 80 and 180 millimeters is normal, some with 200 millimeters as the upper limit. So an amniotic fluid index of 67 millimeters is relatively low. The cause of low amniotic fluid at 37 weeks of pregnancy may be due to fetal structural abnormalities (fetal urinary tract anomalies are common), placental hypoplasia (degenerative changes of the placenta), amniotic membrane lesions (premature rupture of membranes is common), maternal factors (such as hypertensive disorders of pregnancy) and other reasons. Low amniotic fluid at 37 weeks of pregnancy can affect the health of the fetus, increase perinatal morbidity and mortality, and can increase the rate of surgical delivery and induction of labor in the mother. Further examination, close observation, regular rechecking of amniotic fluid index and timely termination of pregnancy if necessary are needed. Pregnant women whose amniotic fluid index is 67 millimeters in 37 weeks of pregnancy should actively seek medical attention, do not delay the condition, under the guidance of the physician in accordance with the norms of regulation or treatment, pregnant women should not use their own medication.