Clancy and many women know that burning, itching, uncomfortable symptoms in the vaginal area could be a sign of infection -- either yeast or bacterial. While women can buy over-the-counter fungicides for yeast infections, only a doctor can prescribe antibiotics for a bacterial infection.
"For the woman who thinks she has a yeast infection and she has a high pH, she likely doesn't," said Hillard, the ob/gyn professor from Stanford.
"But the pH doesn't give an indication that it might be a [sexually transmitted infection], and that's a huge caveat," she said.
Overall, Hillard said she could see usefulness in pH testing and a test round of over-the-counter yeast infection medication. But if someone is at risk for an STI, she recommends heading into the doctor's office anyways.