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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Faint Positive Pregnancy Test Results Despite Negative Blood Test Results?

Hi, I took 2 pregnancy tests both which came up with a very faint line within the time limit, so the next day I went to the local hospital for a blood test (as I m in turkey) the bloods came back negative, the HCG reading came back as 0.21 so I explained that I had 2 faint positive pregnancy tests so the nurse retested the bloods, I came back a hour later and they my bloods were still negative but within that time frame my HCG level had increased from 0.21 to 0.31 and they were unsure why. They didn t say anything else but now I m unsure what to think as both tests had and still have a faint pink positive line it s very very faint but it s there. But my bloods are negative?
Fri, 15 Apr 2016
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General & Family Physician,  's  Response
Hi,
Thanks for posting in HCM.
I have read your description and understand your concern.
Faint line on urine pregnancy test is not reliable and should be interpreted as false positive. In such cases, blood hCG levels are tested and that values are more reliable in confirming pregnancy.
If the blood hCG levels are low, it indicates that it is negative for pregnancy.
You could have a false-positive result if blood or protein is present in your urine. Use of certain drugs, such as tranquilizers, anti-convulsants or hypnotics, may also cause false-positive results.
Sometimes, false-positive test is also encountered in case of 'chemical pregnancy' or 'early miscarriage', when a pregnancy is lost shortly after implantation. In such instances, blood hCG levels would not rise.
Hope the information provided would be helpful.
All the best.
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What Causes Faint Positive Pregnancy Test Results Despite Negative Blood Test Results?

Hi, Thanks for posting in HCM. I have read your description and understand your concern. Faint line on urine pregnancy test is not reliable and should be interpreted as false positive. In such cases, blood hCG levels are tested and that values are more reliable in confirming pregnancy. If the blood hCG levels are low, it indicates that it is negative for pregnancy. You could have a false-positive result if blood or protein is present in your urine. Use of certain drugs, such as tranquilizers, anti-convulsants or hypnotics, may also cause false-positive results. Sometimes, false-positive test is also encountered in case of chemical pregnancy or early miscarriage , when a pregnancy is lost shortly after implantation. In such instances, blood hCG levels would not rise. Hope the information provided would be helpful. All the best.