Dear Abdullah,

We use formalin in our lab to preserve the positive faecal samples and with the years you can still identify the protozoa organisms. It works very well.

Hope this helps.

Regards,

Graciela.

Thank you very much for the input.

Is it Formalin 10% or 5%? and can it preserve the trophozoite forms as well?

Best Regards,

You are very welcome.

We use formalin 10%. Trophozoites as well as cysts forms are well preserved.

Hope this helps!

A good fixative especially for trophozoites, cysts and also helminths ova is SAF (Junod's solution).