Criteria for diagnosis of gestational trophoblastic neoplasia includes all except

TABLE 20-3. Criteria for Diagnosis of Gestational Trophoblastic Neoplasia Plateau of serum β-hcG level (+ 10 percent) for four measurements during a period 3 weeks or longer - days 1, 7, 14, 21. Rise of serum β-hcG level > 10 percent during three weekly consecutive measurements or longer during a period of 2 weeks or more - days 1, 7, 14. Serum β-hcG level remains detectable for 6 months or more Histological criteria for choriocarcinoma.