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What Does The HCG Test Show Alternative Negative And Positive Results?

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Posted on Wed, 7 Jan 2015
Question: I am 3 days late and I have taken several blue ink pregnancy test. Store brands, clear blue standard and digital have all come back positive!!! But when I take first response they come back negative. What does this mean? I'm hoping to be pregnant but is there a chance I'm not?
doctor
Answered by Dr. Dr. Michelle Gibson (24 minutes later)
Brief Answer:
different threshold for HCG detection

Detailed Answer:
HI, thanks for using healthcare magic

Pregnancy tests detect the level of HCG in the urine. This hormone is released in increasing amounts as the pregnancy progresses.

Different tests have different thresholds for HCG detection. It is possible that the other tests can detect the hormone at a slightly lower level than the first response.

If the test is repeated in 2 to 3 days then you should have a definitive response. In general most tests can detect pregnancy by day 11 to 15 after conception.
The fact that the other tests are positive makes it most likely that you are pregnant.

I hope this helps, feel free to ask any other questions
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Dr. Michelle Gibson (3 hours later)
is it possible that I could have gotten false positives? since some believe blue ink are not reliable.
doctor
Answered by Dr. Dr. Michelle Gibson (1 hour later)
Brief Answer:
possible but not likely

Detailed Answer:
HI

It is possible but not likely since 2 or more are positive.

Repeating the test in 2 to 3 days will give clear picture because by this time the HCG level should be high enough for any test to detect.

Please feel free to ask anything else
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Dr. Michelle Gibson

General & Family Physician

Practicing since :2001

Answered : 16835 Questions

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What Does The HCG Test Show Alternative Negative And Positive Results?

Brief Answer: different threshold for HCG detection Detailed Answer: HI, thanks for using healthcare magic Pregnancy tests detect the level of HCG in the urine. This hormone is released in increasing amounts as the pregnancy progresses. Different tests have different thresholds for HCG detection. It is possible that the other tests can detect the hormone at a slightly lower level than the first response. If the test is repeated in 2 to 3 days then you should have a definitive response. In general most tests can detect pregnancy by day 11 to 15 after conception. The fact that the other tests are positive makes it most likely that you are pregnant. I hope this helps, feel free to ask any other questions