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pH

pH is a measure of the acid-base balance of whatever substance is being tested.

Vaginal secretions are normally slightly acid (pH <5.0). 

In testing for the presence of amniotic fluid (during pregnancy, to rule in/out ruptured membranes), the more basic amniotic fluid will turn nitrazine paper a dark blue, indicating a pH of >6.0, and confirming ruptured membranes.

In testing for the presence of bacterial vaginosis, vaginal infections with anaerobic bacteria are often associated with a pH >5.0.

Normal Values

NitrazinePositive250.jpg (13493 bytes)

Source: Operational Medicine 2001,  Health Care in Military Settings, NAVMED P-5139, May 1, 2001, Bureau of Medicine and Surgery, Department of the Navy, 2300 E Street NW, Washington, D.C., 20372-5300

Military Obstetrics & Gynecology
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