The widespread practice of not lubricating plastic vaginal specula because of fears of interfering with bacteriological sample processing has been shown to be invalid. A water based lubricant, Aquagel, had no effect on colony counts when different dilutions of Neisseria gonorrhoeae were cultured, nor did the gel alter the results of standard assays for Chlamydia spp. Without lubrication, plastic specula are more difficult to insert and cause more discomfort, so they should no longer be used in this way.
L Kozakis, J Vuddamalay and P Munday Sex Transm Infect 2006;82: 263-4
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