SummaryIn contrast to P.vivax, the late trophozoite stage of P.ovale tend to retain a recognisable "ring" form for the parasites which become larger. However the rings may have some complexity of shape or become solid - so the distinction from P.vivax can still be difficult. James' dots will be prominent at this stage and malaria pigment will generally be seen. Often the most useful features is the the red cell is elongated and often has cytoplasmic fimbriation. Red cells end to be enlarged, but less so than the very large forms seen in P.vivax.
Very early form A very early ring form that is quite robust with fine dots just visible
Early ring form Dots are now more visible and the red cell begins to show fimbriation.
Early ring form The ring has thickened and in an edge form, but with dots and fimbriation
Intermediate ring The ring is large and the red cell shows some ovoid features of shape
