Collect nasal or other body fluid specimen in clean tube or container. Freeze (preferred) or refrigerate. Indicate specimen source. Include whether the source is from the right or left side of the body, if applicable. If direct collection is not feasible, specimen may be collected using a plain cotton swab or gauze. If gauze is used to collect specimen, circle area on the gauze where specimen was collected and place cotton swab or gauze in as small a container as possible (eg, plain test tube or collection container); do not collect specimen with a culture swab; do not add any liquid to the swab or gauze. Specimens collected from above the shoulders risk salivary contamination, which can degrade the beta-2 transferrin protein. These specimens should be frozen immediately following collection and kept frozen until testing is performed.