Using Gram's Stain to Screen for Group B Streptococcus in Pregnant Women
Author Information
Author(s): Albert H. Adriaanse, Harry L. Muytjens, Louis A.A. Kolle, Jan G. Nijhuis, Jacomina A.A. Hoogkamp-Korstanje
Primary Institution: University Hospital Nijmegen
Hypothesis
The study investigates the effectiveness of Gram's stain in screening for maternal carriership of Group B Streptococcus during labor.
Conclusion
The study concludes that Gram's stain should not be routinely used for intrapartum GBS detection due to its limited sensitivity and positive predictive value.
Supporting Evidence
- The sensitivity of the cervical Gram's stain was only 25%, while the specificity was 99%.
- The introital Gram's stain had a sensitivity of 31% and a specificity of 98%.
- Higher sensitivities were observed in heavily colonized women.
- The study found a poor correlation between Gram's stain results and culture growth density.
- Routine use of Gram's stain is not recommended due to its limited sensitivity.
Takeaway
Doctors checked if a quick test called Gram's stain could help find a germ called Group B Streptococcus in pregnant women, but it didn't work well enough to be used all the time.
Methodology
The study involved taking Gram's stain samples from the cervix and introitus of 1,020 women and comparing the results with cultures from the same sites.
Limitations
The study's findings may not be applicable to all populations due to the specific exclusion criteria and the nature of the sample collection.
Participant Demographics
The study included 1,020 women who were parturients, with specific exclusion criteria such as known GBS carriership and use of antibiotics prior to admission.
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