Microscopy

Eggs of Fasciola hepatica are broadly ellipsoidal, operculated and measure 130-150 µm long by 60-90 µm wide.  The eggs are unembryonated when passed in feces.  The eggs of F. hepatica can be difficult to distinguish from Fasciolopsis spp., although the abopercular end of the former often has a roughened or irregular area.

A	B

A, B:  Eggs of F. hepatica, in unstained wet mounts.