What is the formalin-ether concentration procedure primarily used to demonstrate?

The formalin-ether concentration procedure is primarily utilized for the detection and concentration of protozoan cysts and helminth eggs in stool samples. This technique involves mixing a stool sample with formalin to preserve the specimens and then adding ether to separate the organic material from the inorganic substances. The ether aids in the concentration of parasites by facilitating the gathering of debris and separating it from other components of the stool.

This method is particularly effective for isolating protozoan cysts and helminth eggs due to their resistant nature and presence in fecal samples. The concentration allows for more effective microscopic examination and identification of these pathogens, which are critical for diagnosing infections caused by various parasites. Other options focus on specific characteristics or forms of organisms that may not be accurately represented by this particular concentration method.