What has been the “gold standard” for stool collection systems?
The standard two-vial set has been used for many years and consists of one vial of 10% formalin from which the concentration is performed and one vial of PVA fixative (base fixative can be mercury or non-mercury to which has been added the plastic resin powder – polyvinyl alcohol, PVA) from which the permanent stained smear is prepared.