An apparatus is provided for use with a fluid that contains biological cells, e.g. seminal fluid. The apparatus (20) includes a tray (22) shaped to define a flat upper surface configured to support the fluid, and an underside. The apparatus (20) further includes a plurality of protrusions protruding from the underside of the tray, which may serve to separate the underside from a flat surface on which the tray is placed, or as delineating protrusions that facilitate subsequent retrieval of the fluid following placement on the tray. The tray has a thickness between 0.4 and 0.8 mm, and is transparent or translucent. The upper surface preferably has a level of hydrophobicity that is sufficient for droplets to maintain their shape to a certain extent. A handle (52) facilitates handling of the tray. The apparatus typically fits into a standard-sized cryogenic vial (70).
