Room Temperature Stability of Liquid Amies Media for Vaginal Pathogen Detection

Stability by Pathogen Type

The Centers for Disease Control and Prevention recommends that specimens in laboratory-provided transport devices, including liquid Amies, remain stable at room temperature for 2 days for NAAT testing of Chlamydia trachomatis, Neisseria gonorrhoeae, and Trichomonas vaginalis 1
The American College of Obstetricians and Gynecologists notes that this 2-day window applies to vaginal swabs, endocervical swabs, and urine specimens for NAAT testing of Chlamydia trachomatis, Neisseria gonorrhoeae, and Trichomonas vaginalis 1
Some FDA-cleared multiplex NAAT systems allow room temperature storage for up to 7 days for Trichomonas vaginalis detection specifically, as recommended by the Infectious Diseases Society of America 1
The European Centre for Disease Prevention and Control states that NAATs for Herpes Simplex Virus (HSV) detection allow less strict sample transportation conditions compared to viral culture, which requires refrigeration and transport within 1-2 hours 2, 3, 4
The Clinical and Laboratory Standards Institute recommends that specimens for HSV PCR can be stored in laboratory-provided transport devices at room temperature, though specific duration is assay-dependent and requires laboratory consultation 1

The American College of Obstetricians and Gynecologists advises that wet mount microscopy for Trichomonas requires examination within 30 minutes to 2 hours, as motile organisms lose viability and become undetectable 1
The Infectious Diseases Society of America recommends that saline wet mount preparations for immediate microscopy should be submitted in 0.5 mL saline and examined within this narrow window 1
The Centers for Disease Control and Prevention notes that laboratory-provided transport devices are specifically designed for room temperature stability, and universal transport medium (UTM) or viral transport medium (VTM) may be used for HSV specimens 1

The Clinical and Laboratory Standards Institute recommends that for PCR/NAAT testing of vaginal pathogens, specimens should be collected using laboratory-provided collection devices and placed immediately in liquid Amies or appropriate transport medium, and transported at room temperature within 2 days for standard NAAT panels (CT/GC/TV) 1
The Infectious Diseases Society of America states that extended 7-day room temperature stability is acceptable for specific DNA probe tests and certain multiplex NAAT systems, and consult laboratory for assay-specific requirements, particularly for HSV testing 1

The American College of Obstetricians and Gynecologists recommends NAAT for Chlamydia trachomatis and Neisseria gonorrhoeae as the gold standard, with the same specimen collection device often used for both organisms 5
NAAT for Trichomonas vaginalis should be included simultaneously, as Trichomonas prevalence equals or exceeds CT/GC in certain populations and NAAT offers superior sensitivity 5, 6
Specimens remain stable at room temperature for 7 days, allowing flexibility in transport to Australian reference laboratories 5, 6

The Centers for Disease Control and Prevention recommends quantitative Gram stain (Nugent criteria) as the most specific procedure for bacterial vaginosis diagnosis 7, 8, 9
Place swab directly into transport swab tube, stable at room temperature for 12 hours 7
DNA hybridization probe or multiplex NAAT for microbiome-based BV detection detects Gardnerella vaginalis and other BV-associated organisms 7, 8, 9
Vaginal pH testing shows BV typically has pH >4.5 7, 9
Wet mount with 10% KOH for clue cells and whiff test, submit swab in 0.5 mL saline or transport swab, must reach lab within 2 hours 7, 9

The Infectious Diseases Society of America recommends microscopic examination with 10% KOH preparation to visualize yeast or pseudohyphae 7, 10
Vaginal pH measurement shows yeast typically has pH <4.5 7, 10
Culture is mandatory for recurrent infections to identify non-albicans Candida species that may require different treatment 10
Multiplex NAAT panels can detect C. albicans and resistant species in a single test 7, 10

Optimal specimen collection uses a vaginal swab from pooled vaginal discharge or lateral vaginal walls 9
Avoid contaminating with cervical mucus as this affects test results 9
For NAAT testing, vaginal swabs, endocervical swabs, or urine can be used 5, 6

Never rely solely on wet mount for Trichomonas - its sensitivity is only 40-80% and requires living organisms examined within 30 minutes to 2 hours 5, 6
Don't use wet mount/KOH alone for BV diagnosis - wide variation in sensitivity exists, and consistent microscopic interpretation is difficult 5, 9
Don't assume normal pH excludes all infections - yeast typically has pH <4.5, while BV and Trichomonas have pH >4.5 7, 10
Don't delay wet mount examination beyond 2 hours if using this method, as organisms lose motility and become undetectable 7, 6