OSHA Regulation pertaining to Respiratory Protection for healthcare workers listed in the Code of Federal Regulations (CFR)

A measurement commonly used to measure the outside diameter of needles, catheters, and other cylindrical medical instruments. One (1) Fr is equivalent to 0.33 mm = .013 = 1/77 of diameter.

Cancer of the lyphoid tissue which includes the lymph nodes, spleen and other organs of the immune system