Abstract: A nasal cannula comprises a body portion, having a first end and a second end spaced from the first end by the body portion; a body fluid inlet port formed at the first end, and a body fluid outlet port formed at the second end; and a first nasal inlet port and a first nasal outlet port each extending from the body portion of the cannula. The first nasal inlet port is in fluid communication with the body fluid outlet port, and the first nasal outlet port is in fluid communication with the body fluid inlet port. The nasal cannula includes first and second end caps at the first and second ends respectively. The first and second end caps are attachable to the body portion. The body fluid inlet port is formed in the first end cap, and the body fluid outlet port is formed in the second end cap.