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From your query I understood that you have a previous history of miscarriage and a follow up scan showed a 13 mm endometrium thickness. A 13 mm endometrium thickness is borderline, which means you may or may not have required a surgical evacuation at that time. Also, endometrial thickness is not a valuable guide and we consider the clinical parameters like bleeding per vagina as more important for opting evacuation. I have gone through your recent ultrasonography report (attachment removed to protect patient identity) where endometrium is 7.6 mm. It is fine and I must say you it has nothing related with your previous poor pregnancy outcome. Both the ovaries are also normal and this is essentially a normal scan report. Could you elaborate me whether you have any associated disorders as evidenced in your past case history? If such a case then you need a detailed treatment of those conditions first. Otherwise, there is a possibility of another similar mishap. If you are fit at present then just start to have Folic acid 5 mg tablets once a day. This will help your pregnancy against developing few congenital anomalies.
Investigations to be done:
Blood for Hb gm% (hemoglobin), TC (total blood cell count), DC (differential count), platelet, LFT (liver function tests), total cholesterol, urea, creatinine, FBS (fasting blood sugar) and PPBS (postprandial blood sugar).