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Amsel criteria are used for the clinical diagnosis of bacterial vaginosis and consist of 4 bedside findings as follows: A thin, uniform, gray-white to yellow, homogeneous vaginal discharge An elevated vaginal pH greater than 4.5 Release of a characteristic fishy odor after adding 10% potassium hydroxide (KOH) solution to the wet mount—also known as the whiff test Identification of clue cells on wet mount microscopy Clue cells are vaginal epithelial cells coated with bacteria. A diagnosis of bacterial vaginosis is made when at least 3 of the 4 Amsel criteria are present, making the Amsel criteria a practical diagnostic approach when other testing is unavailable. Bacterial vaginosis is widely recognized as the most common cause of vaginal disorders in females of reproductive age. The condition is present in an estimated 10% to 20% of White females and 30% to 50% of Black females.[1] Estimates for the exact percentage of females afflicted at any given time vary from as low as 5% to as high as 70% worldwide.[2] If symptomatic, patients often complain of vaginal discharge having a classic fishy odor; however, many individuals remain asymptomatic until detection during a routine vaginal examination.[3] If left untreated, bacterial vaginosis may lead to several complications, including inflammation of endometrial or cervical tissue, urinary tract infection, chronic pelvic pain, increased risk of acquiring HIV and other sexually transmitted infections, a higher risk of ectopic pregnancy, and difficulty conceiving.[4] During pregnancy, the consequences of bacterial vaginosis may be even more severe and include the potential for premature labor and delivery, prelabor rupture of membranes, and low birth weight.[5] Treatment for bacterial vaginosis generally involves antibiotic therapy, administered either orally or as an intravaginal gel. The most commonly used antimicrobial agents include metronidazole or clindamycin. Despite treatment, cure rates range from 65% to 85%, and many women experience a relapse in the weeks or months following treatment.[6]

Treatment for bacterial vaginosis generally involves antibiotic therapy, administered either orally or as an intravaginal gel. The most commonly used antimicrobial agents include metronidazole or clindamycin. Despite treatment, cure rates range from 65% to 85%, and many women experience a relapse in the weeks or months following treatment.[6] The Nugent scoring system has long been regarded as the laboratory gold standard for diagnosing bacterial vaginosis. The Amsel criteria, introduced by R Amsel, PA Totten, CA Spiegel, and colleagues in a 1983 American Journal of Medicine publication, provided a clinically based diagnostic approach that built on earlier Gram stain–based methods, such as the Spiegel criteria. In 1991, Nugent and colleagues later refined the microscopic evaluation by introducing a standardized scoring system. The Nugent method involves examining Gram-stained vaginal smears under oil immersion and assessing at least 10 high-power fields to quantify 3 bacterial morphotypes—Lactobacillus, Gardnerella, and curved gram-negative rods. Each of these 3 categories receives a score based on the number of bacteria counted. Subsequently, these 3 scores are summed to yield a total score ranging from 0 to 10. The scoring is as follows: 0-3: Negative for bacterial vaginosis 4-6: Intermediate 7+: Positive for bacterial vaginosis [7] Although the Amsel and modified Amsel criteria are practical and easily performed at the bedside, the Nugent scoring system remains the diagnostic gold standard. The Nugent method is both reliable and cost-effective.[8] However, despite its accuracy, many clinicians regarded it as cumbersome because it requires specialized microscopy skills and is time-consuming due to the need for manual bacterial quantification. Consequently, the Amsel criteria have largely replaced the Nugent system in many clinical settings. Noted limitations of the Amsel criteria include subjectivity in interpretation and reduced reliability in menopausal women, in whom hormonal changes can alter vaginal pH.

Although the Amsel and modified Amsel criteria are practical and easily performed at the bedside, the Nugent scoring system remains the diagnostic gold standard. The Nugent method is both reliable and cost-effective.[8] However, despite its accuracy, many clinicians regarded it as cumbersome because it requires specialized microscopy skills and is time-consuming due to the need for manual bacterial quantification. Consequently, the Amsel criteria have largely replaced the Nugent system in many clinical settings. Noted limitations of the Amsel criteria include subjectivity in interpretation and reduced reliability in menopausal women, in whom hormonal changes can alter vaginal pH. The Amsel criteria, initially published in the American Journal of Medicine in 1983, provide a more accessible, clinically defined basis for diagnosing bacterial vaginosis with only 4 criteria. Although older and seemingly more straightforward, the Amsel criteria have been shown to be comparable to the Nugent scoring system in diagnostic accuracy.[9] The Amsel criteria are generally preferred for their ease and reliance on basic observational microscopy. The Gram stain of vaginal discharge or the Nugent score is the gold standard test for diagnosing bacterial vaginosis.[10] The culture of vaginal discharge is not used to diagnose bacterial vaginosis.

Bacterial vaginosis is a prevalent cause of vaginal disorders in women of reproductive age. Patients with these complaints often present with only a vague sign or symptom, such as vaginal discomfort. The cause of vaginal discomfort poses a broad differential diagnosis, including abdominal, pelvic, or urinary tract causes. This condition must be detected and treated to prevent future complications, particularly in pregnancy. The family practitioner, nurse practitioner, or gynecologist is often the first line of defense in managing cases of vaginal discomfort. Yet it is crucial to involve other members of the patient care team, including nurses, medical assistants, and obstetricians. An interprofessional approach is optimal for patient care in this regard; obstetricians, gynecologists, pediatricians, and family practitioners should consider bacterial vaginosis when patients complain of vaginal symptoms. Patients sometimes find it easier to report symptoms to a familiar or less intimidating healthcare professional. Nurses and medical assistants are vital in this regard and should review the patient's list of concerns and report pertinent complaints to the clinician. Conditions involving changes to vaginal secretions can be embarrassing for patients and should receive treatment quickly with the minimum invasiveness necessary. The Amsel criteria should be used to facilitate efficient, straightforward diagnosis and thereby decrease the prevalence of bacterial vaginosis and its numerous potentially more severe complications. The United States Preventive Services Task Force does not at this time recommend screening for bacterial vaginosis in asymptomatic or low-risk women; however, when suspicion is high, the Amsel criteria are recommended as the diagnostic tool of choice. When detected and adequately treated, the cure rate can reach 80%, preventing further serious complications.[17]

Nursing alone cannot be responsible for using the Amsel criteria. Meaningful participation from nursing includes making a slide, KOH solution, and a vaginal swab available, along with a speculum and gown for all patients who present with vaginal discharge complaints. Amsel criteria provide a practical, bedside method for diagnosing bacterial vaginosis and are commonly used by advanced practice clinicians and other allied health professionals. Accurate assessment requires coordinated interprofessional teamwork, including proper specimen collection, point-of-care testing, and microscopic evaluation. Nurses and allied health team members play a key role in patient education, symptom monitoring, and ensuring timely treatment, while collaboration with clinicians and laboratory staff supports accurate diagnosis and continuity of care.