Researchers say a home test using menstrual blood could detect cervical cancer risk accurately and non-invasively.
A sanitary pad with a sample strip can identify human papillomavirus, which causes most cervical cancers.
Scientists in China compared menstrual blood testing with clinician-collected cervical samples.
The study involved more than 3,000 women aged 20 to 54 with regular menstrual cycles.
Menstrual samples detected high-grade cervical cell changes with 94.7% sensitivity.
This matched the accuracy of samples taken by clinicians.
The findings, published in BMJ, suggest strong screening potential.
Researchers said the method could improve access for women who skip clinical screening.
Cancer Research UK welcomed the innovation but urged further trials.
Experts stressed the test may not suit everyone, including menopausal women.
Campaigners said offering multiple screening options could save lives by increasing participation.
