the present role of ultrasound is to establish whether the ovary responds to gonadotropin stimulation , to ensure that the follicle has reached a minimum size , to determine the number of preovulatory follicles to inform better the patient about the possibilities of multiple pregnancies , to establish that ovulation has occurred after administration of hcg , and to document the presence or absence of ohs .
C0018061
gonadotropin
C0018062
hcg