OG22.1 | Physiological Vaginal Discharge — Summary & Reflection

KEY TAKEAWAYS

Normal vaginal discharge is a composite secretion from four sources: endocervical glands (bulk), vaginal wall transudation, desquamated epithelial cells, and Bartholin gland secretions. It is clear to white, odourless, non-itchy, with pH 3.8–4.5, and varies across the menstrual cycle: maximum at peri-ovulation (clear, stretchy, spinnbarkeit under oestrogen) and minimal in the mid-luteal phase (thick, scant, under progesterone). The protective vaginal ecosystem is maintained by Lactobacillus-dominant flora fermenting epithelial glycogen to lactic acid, which sustains the acidic pH that inhibits pathogens. Disruption — by antibiotics, menstrual blood, alkaline semen, or oestrogen deficiency — raises pH and enables pathogen overgrowth. Clinically, normal discharge has no odour, no pruritus, no dyspareunia, and pH ≤4.5; any departure from these features, especially offensive odour, pruritus, or pH >4.5, warrants pathological evaluation. Counselling women with physiological discharge: external hygiene only, avoid douching, breathable underwear, return if features change.

REFLECT

Reflect using Kolb's framework. Concrete Experience: think of a clinical encounter (or imagine one from the hook scenario) where a woman presented worried about a discharge that turned out to be physiological. Reflective Observation: what features of the history or examination provided the reassurance that it was normal? Abstract Conceptualisation: how does understanding the lactobacillus-pH axis and cyclical variation make your assessment more systematic and your reassurance more credible to the patient? Active Experimentation: in your next gynaecology outpatient session, practise measuring vaginal pH on every patient presenting with discharge — note what proportion have normal pH, and reflect on whether your clinical impression before the pH result matched the finding. Write 3–4 sentences in your logbook.