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Doctor insights on: Do You Need To Be Fasting For A Blood Pregnancy Test

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Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more


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Can a blood pregnancy test be wrong?

Can a blood pregnancy test be wrong?

Only if: The test is done too early, or (obviously) if the test is defective or run incorrectly. ...Read more

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How accurate is a blood pregnancy test?

How accurate is a blood pregnancy test?

Very: Very reliable!! Especially if taken twice with short interval. ...Read more

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When is a blood pregnancy test accurate?

When is a blood pregnancy test accurate?

About 8 days after: Blood HCG tests detect levels very soon after embryo implantation starts. The embryo usually start implanting at about 7 days after conception. So a day later blood HCG levels will start to go up. Urine tests usually turn positive at 10 days after conception. They are slightly less sensitive than blood tests. ...Read more

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How quickly does a blood pregnancy test work?

Around menses time: A blood pregnancy test will be accurate about 12 days after ovulation, which is usually just prior to your expected menses. By the time of your expected period a pregnancy test should be accurate. ...Read more

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How early can you take a blood pregnancy test?

How early can you take a blood pregnancy test?

More reliable if...: A urine pregnancy test can be taken any time, but it gives a reliable result about 3 weeks after sex (when conception might have occurred), or 1 week after missing a period. ...Read more

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How long before I can take a blood pregnancy test?

How long before I can take a blood pregnancy test?

Around menses time: A blood pregnancy test will be accurate around 12 days after ovulation, which is usually just prior to expected menses. Generally by the time of your expected period a pregnancy test will be accurate. ...Read more

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How soon can a blood pregnancy test detect pregnancy?

How soon can a blood pregnancy test detect pregnancy?

Missed period: One gets concerned about pregnancy when misses period. By that time blood pregnancy test should be pregnancy. ...Read more

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Please tell me, could a blood pregnancy test be wrong?

Yes, sort of: A blood or urine pregnancy test detects HCG hormone, not pregnancy per se. If a person has a tumor producing HCG the test will be positive but wrong in that the person is not pregnant. If you do the test too early and it is negative, it could be construed to be wrong as the women is pregnant but the fetus has not yet made enough hcg. ...Read more

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Can a blood pregnancy test be wrong? Could it be to soon?

Can a blood pregnancy test be wrong? Could it be to soon?

No: Usually blood tests are more sensitive than a urine pregnancy test and can detect a pregnancy earlier. If your test is negative around the time of your period, you can repeat it in 1 week. If its still negative, you are not pregnant.
Best wishes
Dr M ...Read more

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What does a blood pregnancy test mean when its borderline?

Inconclusive: It means that you probably took the test too soon. If your period is not late yet you must wait. If that is not the case then take a second test. ...Read more

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Can a blood pregnancy test tell you how far along you are?

Can a blood pregnancy test tell you how far along you are?

Blood test: Yes depending on which blood tests they are doing. But best to count from the time of exposure. ...Read more

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How can a blood pregnancy test be performed and how does it work?

Blood is drawn: Your doctor will order a pregnancy test to check your HCG level and this will tell you about how far along you are. The lab will draw your blood out of your arm. ...Read more

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A blood pregnancy test is slightly positive. Should I take it again?

Yes.: You should do the home test 4-5 days after a missed period. Use first morning urine and follow the instructions in the kit carefully. Testing ealier may give a positive result but a negative result is not reliable. ...Read more

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I had a blood pregnancy test today how long does it take to get the results back?

I had a blood pregnancy test today how long does it take to get the results back?

1day: At the lab it takes < 24 hours - however it may take longer to get to you. I'd call next day and ask them to "call and get result" if it's not available. Typically, most offices say " 2-3 days" before results are back..... But..... Good luck! ...Read more

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I had a blood pregnancy test do ne and the level was a 0.8 dose this mean I am pregnant?

I had a blood pregnancy test do ne and the level was a 0.8 dose this mean I am pregnant?

Dunno: The most accurate test is for the beta chain of human chorionic gonadotropin. It is a quantitative test (gives you a number, not a decimal) and is detectable as early as 5 days after implantation of the fertilized egg into the uterine wall. I don't know what test you had but you can get a quantitative beta HCG. ...Read more

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Is it possible for a blood pregnancy test to be negative at 16 days late and still be pregnant?

Is it possible for a blood pregnancy test to be negative at 16 days late and still be pregnant?

Yes and no: Usually if a woman is 16 days late she is at 4 weeks gestational age and the blood pregnancy test would have to be positive.

But if that women had just randomly a late ovulation, say she ovulated 3 weeks later than normal, a woman could be just a few days pregnant and the blood test would be negative. But she would still be "late". ...Read more

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Had a blood pregnancy test at four weeks and it was negative. How accurate is this at four weeks?

Very accurate: Do you mean four weeks after a missed period? If yes, a negative blood test at that stage is very accurate. If you have any doubts, you may request an ultrasound examination. ...Read more

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Is it possible to get the results of a blood pregnancy test in less that 20 min. Or does it take longer to process?

Is it possible to get the results of a blood pregnancy test in less that 20 min. Or does it take longer to process?

Depends where: Doing the test itself is fast but unless your doctor is processing blood work in the office it probably is being referred out to an outside lab company. Doing a urine test is much faster and can detect pregnancy with a BHCG of > 20. This means it only misses pregnancy in the first few days after conception ...Read more

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I just took a blood pregnancy test yesterday. The numbers came back - 124. I'm not sure if that is negative or positive.?

I just took a blood pregnancy test yesterday. The numbers came back - 124. I'm not sure if that is negative or positive.?

Positive: Yes the serum pregnancy hormone level is above the positive threshold. Therefore this is an early pregnancy. This does not guarantee viability of the pregnancy. Only time will tell the future of the pregnancy. Hope this helps. ...Read more

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Is 4 weeks too soon for a blood pregnancy test?

Is 4 weeks too soon for a blood pregnancy test?

No: Most pregnancy tests will turn positive about 2 weeks after conception. In most women with regular cycles, this is 4 weeks after the start of their last period. If is negative right at 4 weeks and your cycle is abnormal or late, then check again 1 week later. ...Read more

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Can a blood pregnancy test be wrong if done too early?

Yes: Beta HCG is measured in both blood and urine and is usually detected between 6-12 days after fertilization when implantation occurs. A quantitative bhcg can measure very low levels of bhcg but the typical qualitative blood test usually turns positive at a higher level and is not always better than the urine test. So to be sure you might want to retest some days later. ...Read more

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Will a blood pregnancy test 16 days after sex be accurate?

Will a blood pregnancy test 16 days after sex be accurate?

Missed Period: Probably if you have also missed a period. If you have not missed a period yet you tested too soon. ...Read more

Dr. Stephen Sudler
482 Doctors shared insights

Pregnancy Test (Definition)

A pregnancy test measures a hormone called human chorionic gonadotropin (HCG). HCG is a hormone produced during pregnancy. It appears in the blood and urine of pregnant women as early as ...Read more