What Causes Positive Followed By Negative Pregnancy Test Results?

Posted on Mon, 28 Sep 2015

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

Mon, 28 Sep 2015 Answered on

Mon, 19 Oct 2015 Last reviewed on

Question : I have taken hcg injection 2000 iu. For fun Tested hpt on same day and then next day, it came negative. What can be the reason? I am going through 4th iui cycle.

Answered by Dr. Richa Agarwal (38 minutes later)

Brief Answer:
Most likely false positive.

Detailed Answer:
Hello dear,
Thanks for trusting hcm about your health care.
I have gone through your history and understand your concerns.
From your history I can understand that your urine pregnancy test positive first and negative on next day,it is most likely due to hcg shot because it remains in your body upto 14 days.
To confirm the diagnosis you should get your quantitative beta hcg blood test.
Hope found useful, feel free to discuss more information.
Good luck.
Regards

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar

Follow up: Dr. Richa Agarwal (6 minutes later)

No it was negative on both the days same say and next day also. Ideally it should come positive as i gave taken hcg injection right? Is there any other problem?

Answered by Dr. Richa Agarwal (6 hours later)

Brief Answer:
Most likely due to low sensitivity of test.

Detailed Answer:
Hello dear,
Sorry for the delay in my response.
Yes,usually on the same day urine pregnancy test may be positive due to hcg shot because its half life is 28 hrs.
In your case if test results are negative it maybe due to low sensitivity of the test or it maybe false negative.
Hope found useful.
Good luck.
Regards

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar