Nugent's scoring system for diagnosis of bacterial vaginosis
Nugent's scoring system for diagnosis of bacterial vaginosis
Score
Lactobacillus morphotypes
Gardnerella and Bacteroides morphotypes
Curved gram-variable rods
0
4+
0
0
1
3+
1+
1+ or 2+
2
2+
2+
3+ or 4+
3
1+
3+
4
0
4+
The score is determined by the average number of each morphotype seen per oil-immersion field but varies with the type of bacteria. Excluding Lactobacillus morphotypes, a score of 0 means no morphotypes are present; 1, 0 to 1 morphotype present per high-power field; 2, 1 to 4 morphotypes present; 3, 5 to 30 morphotypes present; 4, 30 or more morphotypes present. A total score of 7 to 10 is indicative of bacterial vaginosis infection, 4 to 6 is indeterminate, and 0 to 3 is normal. (Total score = lactobacilli score and Gardnerella vaginalis score and Bacteroides species score and curved gram-variable rod score.)
Adapted from data in Nugent RP. J Clin Microbiol 1991; 29:291.
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