Bacterial Vaginosis Diagnosis and Testing

Equipment and Collection Procedure

• The Centers for Disease Control and Prevention recommends using a speculum, cotton swab, pH paper, microscope slides, normal saline, and 10% potassium hydroxide for BV diagnosis 1, 2, 3, 4, 5
• The American College of Obstetricians and Gynecologists suggests lubricating the speculum with warm water only to facilitate insertion 2
• The Infectious Diseases Society of America recommends inserting the speculum completely before opening the blades to minimize discomfort 2
• The Centers for Disease Control and Prevention advises visualizing the vaginal walls and cervix, noting any discharge or lesions 6
• The Clinical Infectious Diseases society recommends using a cotton swab to collect vaginal secretions from the pooled vaginal discharge or lateral vaginal walls 5
• The American College of Obstetricians and Gynecologists suggests avoiding contaminating the swab with cervical mucus as this may affect test results 7

Diagnostic Testing

• The MMWR Recommendations and Reports suggests preparing samples for pH testing, wet mount preparation, whiff test, and discharge characteristics to diagnose BV according to Amsel criteria 4, 3
• The Clinical Infectious Diseases society recommends dipping pH paper in the secretions left on the speculum tip after removal and reading the color change within 10 seconds 6
• The Centers for Disease Control and Prevention advises that BV typically has pH >4.5 4, 5
• The MMWR Recommendations and Reports suggests placing vaginal secretions from swab in 0.5-1 mL of saline and applying to microscope slide and cover with slip for wet mount preparation 6, 5
• The Clinical Infectious Diseases society recommends examining under microscope for "clue cells" (epithelial cells covered with bacteria) 6
• The MMWR Recommendations and Reports suggests mixing vaginal secretions with 10% KOH on a slide for whiff test and noting a positive test produces a characteristic "fishy" odor 4, 3

Laboratory Testing and Transport

• The Clinical Infectious Diseases society recommends placing swab in appropriate transport medium if sending to laboratory 7, 5
• The Centers for Disease Control and Prevention advises that transport time considerations include optimal within 30 minutes and maximum 2 hours for wet mount, stable up to 12 hours at room temperature for Gram stain, and stable up to 7 days at room temperature for DNA hybridization probe 5, 8

Alternative Diagnostic Methods

• The Clinical Infectious Diseases society recommends using Gram stain (Nugent criteria) as a more objective method for BV diagnosis with scoring of bacterial morphotypes 5
• The Clinical Infectious Diseases society suggests using DNA hybridization probe as a commercial test available that detects Gardnerella vaginalis and other BV-associated organisms 5, 8
• The Clinical Infectious Diseases society recommends using molecular testing as newer nucleic acid amplification tests (NAATs) provide objective results and can detect fastidious bacteria 8

Speculum Insertion with an Intact Hymen

Anatomical Considerations

• The hymen is a membrane that partially covers the vaginal opening but typically has a natural opening to allow menstrual flow, allowing for careful insertion of appropriately sized instruments in most cases 9
• An intact hymen does not completely obstruct the vaginal canal, enabling the insertion of a speculum when done carefully 9
• Rare cases of imperforate hymen may prevent speculum insertion, and alternative methods should be considered in such cases 9

Proper Technique for Speculum Insertion with Intact Hymen

• Using the smallest appropriate speculum, such as a Pederson speculum, minimizes discomfort during the procedure 10, 11
• Inserting the speculum along the posterior vaginal wall avoids pressure on the sensitive urethra, reducing potential discomfort 10, 11
• Inserting the speculum completely before opening the blades minimizes discomfort, and the blades should be opened gradually and only as much as necessary for visualization 10

Important Clinical Considerations

• Explaining the procedure thoroughly to reduce anxiety is crucial, as anxiety can cause muscle tension and increase discomfort during speculum insertion 12
• If resistance is met during insertion, the speculum should not be forced, as this could cause trauma to the patient 10, 11
• For patients with suspected imperforate hymen, a saline-soaked cotton swab can be gently inserted to demonstrate patency before attempting speculum insertion, ensuring a safe procedure 9

Special Situations

• The American Academy of Pediatrics recommends that speculum examinations in adolescents should only be performed when medically necessary, not routinely 13
• Current guidelines state that routine Pap tests are not recommended before age 21, which reduces the need for speculum exams in younger patients 13
• In cases of sexual assault evaluation, a speculum exam may be necessary but should be performed by experienced providers to ensure a thorough and sensitive examination 14, 15

Common Pitfalls to Avoid

• Forcing insertion when resistance is encountered can cause trauma and negative experiences, emphasizing the need for gentle and careful technique 12
• Opening the speculum before complete insertion increases discomfort and should be avoided in clinical practice 10, 11
• Assuming an intact hymen means speculum examination is impossible is incorrect in most cases, as the hymen typically has a natural opening allowing for speculum insertion 9

Optimizing Difficult Speculum Examinations

Immediate Technical Adjustments

• The American College of Obstetricians and Gynecologists recommends selecting the smallest appropriate speculum to minimize vaginal wall collapse and patient discomfort, with studies suggesting the use of a Pederson speculum rather than a Graves speculum 16, 17

Addressing Vaginal Wall Collapse

• Nulliparous patients and those with anxiety have higher rates of muscle tension that can make examination more difficult, according to the American Journal of Obstetrics and Gynecology 16, 17

Patient Preparation to Reduce Anxiety-Related Muscle Tension

• The American College of Obstetricians and Gynecologists suggests using low lighting, calming slow-rhythm music, and aromatherapy to reduce anxiety, as well as providing warm towels for the abdomen and cold towels for the forehead for comfort 16, 17
• Consider naproxen 500-550 mg or ibuprofen 800 mg 1-2 hours prior to the examination for patients with significant anxiety or prior failed attempts, as recommended by the American Journal of Obstetrics and Gynecology 16, 17
• Topical anesthetics, such as EMLA cream or 10% lidocaine spray, can be applied to the cervix and canal if dilation or instrumentation is anticipated, according to the American Journal of Obstetrics and Gynecology 16, 17

Special Populations Requiring Modified Technique

• Verbally checking in for discomfort and offering to pause or stop the examination at any point is crucial for patients with a history of trauma, as recommended by the American Journal of Obstetrics and Gynecology 16, 17

Common Pitfalls to Avoid

• Failing to address patient anxiety perpetuates muscle tension that worsens the technical difficulty of the examination, according to the American Journal of Obstetrics and Gynecology 16, 17