Do my specimens in suspension need to be concentrated, and what kind of sample volume is required?

In order to provide the best results possible, it is very important that each particular specimen to be examined is at a minimum concentration of 2.0 × 10⁷ per milliliter.

If concentration of the sample is difficult, ABI has a full-service BSL-3 laboratory where samples can be concentrated in a matter of a few hours to meet the specifications of negative staining techniques.