test. Bivariate analysis between characteristics and hCG level tested with chi-square. Results Twelve cases were analyzed, consisted of choriocarcinoma (7/12), Placental Site Trophoblastic Tumor (2/12), invasive mole (2/12), and hydatidiform mole (1/12). The average patient's age was 37 years old. The highest preoperative hCG level was 378.909 mIU/mL. The highest post-operative beta hCG level was 136.710 mIU/mL. The Average decrease of serum beta HCG was 72.317,34 mIU/ mL. Post-operative hCG levels were found to be normal (<5 mIU/mL) only in four cases (33.33%). There was significant difference of hCG level between pre and post hysterectomy (p=0,002) with strong correlation (r=0,773). Clinical characteristic that correlated with normal Beta hCG level after hysterectomy was WHO score (p=0,007). Age, parity, history of miscarriage, last child age, histopathology type, and surgery type were not correlated with normal hCG level after hysterectomy. Conclusion Hysterectomy was a procedure that can effectively decrease serum Beta HCG level in GTN patients. WHO risk score also correlated with the post-hysterectomy level of serum Beta HCG.
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