GUANAJUATO, Mexico — The woman came into the hospital, bleeding, scared and barely out of her teens. But before anyone would treat her, the authorities had to be called.

Doctors believed that she had had an illegal abortion, so first, a man from the prosecutor’s office had to arrive and ask her about her sexual history. Then, after she was treated but still groggy from the anesthesia, another investigator showed up and took her statement.

The investigation is still open two months later. Prosecutors are seeking medical records to determine whether they will charge the young woman, who asked that her name not be used, as well as the person they suspect helped her.

Here in the state of Guanajuato, where Roman Catholic conservatives have controlled government for more than 15 years, it is standard procedure to investigate suspected cases of abortion. But Guanajuato is no anomaly, women’s rights advocates and some health officials say, since a broad move to enforce antiabortion laws has gained momentum in other parts of Mexico.