PH Test Strips - Walmart.com
2020-11-9 · Diagnostic methods using nitrazine paper and determination of ferning (arborization) have sensitivities approaching 90 %. The nitrazine test involves placing small amounts (a drop or two) of vaginal fluid onto paper strips prepared with Nitrazine dye. A chemical reaction occurs and the strips change color, indicating the pH of the vaginal fluid.
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