Surgery Miscellaneous dd999560 16F circumference of a catheter means A 4.8 mm B 2.8 mm C 8.4 mm D 8.2 mm High-Yield Explanation Ans. a (4.8 mm). (Ref. B & L, Surgery, 23rd ed., 1262)3.12 SF = 1mm, hence a 16F Circumference of catheter means (r)