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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Can A Transvaginal Scan Test Show False Negative Results?

Good day to all doctors..i need an obgyne to answer these questions: I am confused, when i had a pregnancy test just last Sunday, it was negative at first then hours passed by, when my sister was about to throw the test pack, i checked it again and i think there is a second line but it is not clear, it is a faint line......i tried again but i bought a cheaper one this time it was negative but there was no instruction on how many drops to put, after 30minutes i added more drops then there was a faint second line that appeared....but i think it was not valid anymore....now to clear my confusion, i went to my doctor and was asked for a TVS, the result was negative...but i have a feeling that i am pregnant... is there a case that pregnancy will not still be detected because it might be too early for the ultrasound? thank you
Fri, 12 May 2017
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Radiologist,  's  Response
It depends on when you had your last period. If the first day of your last period was about 5-6 weeks back, then the TVS should have picked it up. Before this time,i.e., if your period was less than 5 weeks back, it may show false negative results because it is too early for TVS to pick up.
In a rare occasion, TVS can miss a pregnancy outside the uterus even after 5-6 weeks. But there are other signs that suggest pregnancy.
It is advisable to repeat the urine test after 2 weeks.
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Can A Transvaginal Scan Test Show False Negative Results?

It depends on when you had your last period. If the first day of your last period was about 5-6 weeks back, then the TVS should have picked it up. Before this time,i.e., if your period was less than 5 weeks back, it may show false negative results because it is too early for TVS to pick up. In a rare occasion, TVS can miss a pregnancy outside the uterus even after 5-6 weeks. But there are other signs that suggest pregnancy. It is advisable to repeat the urine test after 2 weeks.