Platelets of 89×10^9/L in 38 weeks of pregnancy are not very serious, which can be physiologic or caused by other diseases such as viral or bacterial infections. The normal range of platelets should be 100-300×10^9, which is relatively wide. Now at 38 weeks pregnant, platelets are 89×10^9, slightly low, may be a normal phenomenon, transient low during pregnancy, followed by termination of pregnancy, if platelets return to the normal range, no need to worry. It may also be related to diseases such as bacterial or viral infections. 1. Normal phenomenon. After pregnancy, as the fetus grows, the blood volume increases. The increase in blood volume leads to dilution of blood cells, and low platelets may occur. 2. Bacterial or viral infection. Bacterial or viral infections may also cause thrombocytopenia, which is a common cause of thrombocytopenia, such as upper respiratory tract infections. Low platelets may also be caused by other diseases. If the platelets decline progressively, it is recommended to consult a doctor in time to clarify the cause of the disease.