Fluid sample conduits have absorbing bodies to absorb contaminants in fluid samples or suspensions. The absorbing bodies are shaped to provide surface area for absorption, absorbent materials, and have flow channels for decontaminated portions of the sample to flow through the couduit and be collected. Applications include those in the medical and industrial fields. Absorbing bodies according to this disclosure can also serve the functions of discarding, changing, analyzing, and signaling the composition or physical characteristic or contents of the first, contaminated portion of a fluid sample or suspension through a conduit assembly.
