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25. My HPT was positive, but the urine test at my doctor's was negative. Huh? Urine-based pregnancy tests vary widely in sensitivity. Often a home-based test (HPT) is much more sensitive than the kind your doctor's office uses. (Often doctors or clinics use tests that are sensitive to 50-100 mIU/mL of hCG; most home tests detect a level of 15-50 mIU/mL of hCG. See the HPT Overview for various HPT sensitivities.)

Practically speaking, this usually works just fine. By the time a woman suspects pregnancy and confirms with her doctor, she has usually missed her period, is farther along in her pregnancy, and has higher levels of hCG in her urine-- so a less-sensitive test will suffice. On the other hand, women who are trying to conceive and/or monitor their fertility are often much more in tune with their cycles and the potential for pregnancy, and therefore test earlier with more sensitive tests. So this scenario is actually fairly common. Because HPT's are extremely reliable, you should consider yourself pregnant following a positive test. Your doctor should retest your urine again in a few days, after your hCG has had time to increase.

My blood test was negative. Can I still be pregnant? Overall, blood tests are more accurate than urine tests because your blood cannot be too diluted (like urine) and does not require that your body metabolize hCG into your urine (which some women do slowly or, rarely, not at all.) But, in some circumstances, yes, you can be pregnant without a positive blood test.

There are two different kinds of blood pregnancy tests, known as qualitative and quantitative. A qualitative test measures the quality of your blood: either pregnant or not. The test is much like an HPT, except it uses your blood rather than your urine. It means the laboratory has a pre-set cutoff point for determining "pregnant." In some labs, a level of 5+ will come back as a positive test; in other labs, your blood must have 25+ mIU/mL of hCG. Usually the lab will not tell you what their cutoff point is; they will simply tell you yes or no, just like peeing on a stick. You may be pregnant, but just "a little" pregnant, and the blood test was not sensitive enough to detect it.

A quantitative blood test is much more specific; it measures the exact quantity of hCG in your bloodstream. Non-pregnant women of childbearing age have anywhere from 0-2 mIU/mL† of hCG in their blood (average is about 0.5†.) Generally anything over 5 is considered pregnant, though 3-4 is a "gray zone" (a little too much for normal non-pregnant, but not quite high enough to pass muster at the lab.) Peri- and post-menopausal women may have up to 9.5 mIU/mL† of hCG. If you have this type of blood test performed, there is little doubt that the results are correct (barring lab error.) Exception: prior to implantation, the embryo does not secrete hCG and cannot be detected. Therefore, it is possible to be in the very early stages of pregnancy and still get a negative blood test.

2006-06-05 16:24:05 · answer #1 · answered by Anonymous · 4 2

Have you been tested for other things. SOmetimes when a woman is showing she is pregnant she could have problems in her ovaries areas. You should definetly talk to your doctor and make sure everything is functioning ok. I had a friend that had cysts on her ovaries and her test were coming up positive.

2006-06-05 22:55:45 · answer #2 · answered by sonicburnt 5 · 0 0

Certain drugs and diseases can cause a false pregnancy test.so it would be wise to see your family doctor. Have you gynecologist forward the results of your pregnancy tests, ultrasound and blood work to the family doctor. Your family doctor can then investigate and get to the bottom of the issue.

2006-06-05 23:00:55 · answer #3 · answered by ilse72 7 · 0 0

Not to scare you, but you could have a positive pregnancy test for some other medical problem such as a tumor. See your medical doctor.

2006-06-05 22:54:38 · answer #4 · answered by Chris P 2 · 0 0

did u use the same brand? ultrasound might not show if u are too early in ur pregnancy. try the test again and see a different gynae

2006-06-05 23:05:02 · answer #5 · answered by Anonymous · 0 0

have you had a miscarrige recently or given birth sometimes pregnancy test will indicate positive just becaue all those homrmones arent out of your system

2006-06-05 22:56:53 · answer #6 · answered by sony93931 4 · 0 0

WOW...I really dont know what to say..I have no idea why this could be happeing...Have you had a miscarrige recently?
Any bleeding in the pregnancy
Perhaps you miscarried?
I really am unsure..
Good Luck though :)

2006-06-05 22:54:45 · answer #7 · answered by ♥♥ 4 · 0 0

Consult your obstetrician/gynecologist immediately with your question, not us non medical professionals.

2006-06-05 22:55:39 · answer #8 · answered by J P 4 · 0 0

the pregnancy tests could be expired or not working properly

2006-06-05 22:54:26 · answer #9 · answered by casparin0324 6 · 0 0

question your gynecologist on th possibility of having some tumors , get a MRI ,, IMPORTANT DO SOON

2006-06-05 22:55:48 · answer #10 · answered by anissia 6 · 0 0

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