How long after a miscarriage can a test turn negative?

Patient's question:

Hello, I had a medication abortion on November 13th. On the 29th, I went to the hospital for a check-up, and it came out clean with no abnormalities. But this morning, I used a test strip and it still showed two red lines. I want to know how long it takes for the test to turn negative after an abortion.

Doctor's answer:

Generally, it's not possible @ unless you have testing errors or a possible ectopic pregnancy. Identifying the cause after a natural miscarriage is the most important thing. The duration it takes for the blood to clear varies among individuals, so wait and see. It usually doesn't exceed two weeks. If you have a history of fetal demise and natural miscarriage, you should find the cause before the next infertility to avoid repeating the same mistakes.
Test hormone levels and anti-embryonic antibodies using electrochemical luminescence during days 3-5 of your period; perform a vaginal examination, dynamic digital hysterosalpingography, and vaginal four-dimensional color ultrasound 3-5 days after your period ends. This usually leads to a definitive diagnosis. Some patients may still need cervical dilation tests, electronic hysteroscopy, or laparoscopy for further examination.

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