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This happened to me when I got pregnant with my third child. The first test was negative and the second positive. From what I understand, a pregnancy test can give a false negative but rarely gives a false positive.
Try one more time. If it is again positive, then you probably are pregnant.
No , but a negative test can be a false positive .
Only if the first HIV test was false positive can the test results change.
It is possible to have inconclusive test results, but not to test both positive and negative at the same time.
The chances of a false negative chlamydia test result with the newest test kits may be as high as 10%. The chances of two false negative results are 1%, and of three are one in one thousand. Having a negative result followed by a positive normally means that you were infected with chlamydia between the first and second test.
I have tried the test the first time it was milky white (negative) and I wasn't pregnant I did a urine test after. The second time I got an oily film at the top (positive) I took a pregnancy the next day it was positive 6 weeks and counting! :)
If it's a pregnancy test the answer is no, A test can come back negative even though its positive. But if it's positive, it's positive 99% of the time.
negative
someone who has been tested for tb and had a negative result but then on a second test has a positive result
Yes, it is very possible. Many people can carry a bacteria or virus, then transfer it to another person (chlamydia and meningitis are good examples), and it is often that the second person gets the disease, without the first person ever being aware of their dangerous status.
It would be almost impossible to test negative if a person is HIV positive.