A container assembly is disclosed including an outer container, a hollow inner member, and a closure. The outer container has a closed bottom, an open top, and a sidewall extending there between. The hollow inner member is disposed within the outer container and has an inner surface defining at least one capillary channel. The inner member includes a first end adjacent to the open top of the outer container and has an outer periphery seated against the sidewall of the outer container. The closure has a proximal end and a distal end. The closure proximal end is seated at least partially within the first end of the inner member to seal the outer container and inner member and define a fluid collection chamber. The closure distal end defines a recessed area shaped to direct fluid under capillary action to the at least one capillary channel in the inner member.Se describe un conjunto de recipiente incluyendo un recipiente exterior, un elemento interior hueco, y un cierre. El recipiente exterior tiene una parte inferior cerrada, una parte superior abierta, y una pared lateral que se extiende entremedio. El elemento interior hueco está dispuesto dentro del recipiente exterior y tiene una superficie interior definiendo al menos un canal capilar. El elemento interior incluye un primer extremo adyacente a la parte superior abierta del recipiente exterior y tiene una periferia exterior asentada contra la pared lateral del recipiente exterior. El cierre tiene un extremo próximo y un extremo distal. El extremo próximo de cierre está asentado al menos parcialmente dentro del primer extremo del elemento interior para sellar el recipiente exterior y el elemento interior y definir una cámara de recogida de fluido. El extremo distal de cierre define una zona rebajada conformada para dirigir fluido bajo acción capilar al al menos único canal capilar en el elemento interior.
