In case of hydatidiform mole, investigation used for diagnosis is?

All of the above REF: Dutta obs 61' e p. 196 Investigations\\ used in H.mole ultrasound * * * * Snow storm appearance in uterus Complete molar pregnancy (chorionic villi show diffuse hydropic swelling and absence of fetal shadow) Some fetal tissue seen For diagnostic purpose USG alone is adequate, hormonal assays are for post molar and post chemo follow up Serum beta HCG * Very high in molar pregnancy * > 40000 detected by RIA * Rapidly increasing levels suggest molar pregnancy Chest X-ray * To rule out lung metastasis CT scan * To rule out brain and liver metastasis