Generally, there is a decrease in platelet count in pregnant women and it will be due to many reasons. The two main causes of<unk>  are a decrease in the production of platelets in the bone marrow and an increase in the destruction of the platelets. Platelets, along with other components of the blood, are produced in the spongy tissue found in the bone, known as bone marrow. Low platelet count maybe due to the decreased production of platelets in the bone marrow. A decreased production would be due to vitamin B12 deficiency, iron deficiency, aplastic anemia, viral infections, chemotherapy, alcohol consumption, leukemia, myelodysplasia, and cirrhosis. During pregnancy, the fetus’ waste products diffuse into the mother’s sinuses (blood stream), and cause the mother's spleen to become overactive and enlarged. Normally, the spleen filters and removes the waste products and with the overload of unwanted substances in the bloodstream, the spleen will remove blood cells too quickly or store the platelets. In both cases, the overactive spleen would cause a decrease in the circulation of the platelets.
Gestational thrombocytopenia
Neonatal alloimmune thrombocytopenia
X linked thrombocytopenia
Hypodysfibrinogenemia
Exophilia
Dysfibrinogenemia
Congenital amegakaryocytic thrombocytopenia
Acquired haemophilia