<prompt> Most common cause of platelet.L in pregnancy :ImmuneIncidentalIdiopathicBenign Gestational  <response>: Ans. is d i.e. Benign Gestational Gestational thrombocytopenia Benign Gestational Thrombocytopenia It is the most common cause of thrombocytopenia accounting for 80-90 of all cases of thrombocytopenia occuring during pregnancy. Exact cause is not known may be due to hemodilution and increased platelet consumption. Platelet count is rarely 70,000mm3. Women are asymptomatic and their is no HO bleeding. Condition is benign and has no risk to mother or infant. The only problem associated with it is - that anaesthesiologists are reluctant to give epidural or spinal anaesthesia if platelet count is 1lakhmm3. Treatment with steroids and IgG or platelet transfusion before delivery is sometimes necessary. Other rare causes of thrombocytopenia during pregnnacy : Associated with eclampsia preclampsiaHELLP syndrome Immune thrombocytopenia Consumptive coagulopathy from placental abruption, severe obstetrical heamorrhage. Inherited thrombocytopenia i.e. Bernard soulier syndrome. 