Top
40
Doctor insights on: False Positive Blood Pregnancy Test

Share
1

1
Can pregnancy blood test give false negative. 3 days late, urine test negative and blood test negative too?

Can pregnancy blood test give false negative. 3 days late, urine test negative and blood test negative too?

False negative PG: A false pregnancy test is possible however, in this case you also have a negative blood pregnancy test which is far more accurate. ...Read more

Dr. Eric Weisman
4 doctors shared insights

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


2

2
Preg test positive but blood test negative missed period?

Preg test positive but blood test negative missed period?

Timing: It is possible that the urine pregnancy test detected HCG that was in the urine even as a pregnancy was failing (impending miscarriage) but by the time a blood test was done, the miscarriage had already occurred and the levels of the HCG pregnancy hormone were cleared. Alternatively, it could have just been a false (+) urine pregnancy test. ...Read more

3

3
Positive HIV screener test at blood donation... Negative IFA and Negative NAT... False positive?

Positive HIV screener test at blood donation... Negative IFA and Negative NAT... False positive?

Yes: The initial screening test for HIV is very sensitive, but not very specific. The back up screening tests are much more specific for HIV. ...Read more

4

4
False positive stress test reason?

False positive stress test reason?

Body habitus: Most common cause of false positive stress test is body habitus. This commonly affects women because the heart rhythm needs to be picked up through their breast tissue. ...Read more

See 2 more doctor answers
5

5
Hcg 50 positive blood test two negative urine please help.

Hcg 50 positive blood test two negative urine please help.

Recheck blood: You need to have the blood levels checked again. You expect the level to about double in 2 days with a normal pregnancy. ...Read more

7

7
Home pregnancy test was positive but blood hCG came back negative. Ob perform a blood test again. Hcg 750 progesterone 21. Why first hCG was negative?

Home pregnancy test was positive but blood hCG came back negative. Ob perform a blood test again. Hcg 750 progesterone 21. Why first hCG was negative?

Lab error: Presuming the first blood pregnancy test was close to the second, one of them had to be a lab error, probably the first one that was negative. If there is any question about the health of the pregnancy, your doctor can follow the bhcg level to see if it is rising appropriately and obtain an ultrasound when the level is high enough.For more info www.Askyourgynecologist.Org. ...Read more

9

9
What causes false positive HCV antibody test results?

What causes false positive HCV antibody test results?

Misinformed?: Who told you that your hep c test was false? If you have no viral load that means you cleared an infection. Are you sure you are getting the right advice? ...Read more

11

11
Are false positive herpes test likely?

Are false positive herpes test likely?

No: A positive antibody means you're infected with herpes. That doesn't mean you're developing outrbreaks, but it does mean that you at least have latent herpes somewhere in your body. A positive culture or pcr for herpes means you have an active lesion. ...Read more

12

12
I took 7 home pregnancy test all positive but doctor test say negative and blood test was negative why?

I took 7 home pregnancy test all positive but doctor test say negative and blood test was negative why?

Please clarify: Perhaps the reason can be known when you tell us honestly why you kept testing at home even though the test told you a positive answer. Something must have clued you into the fact something was not normal. You tell us. ...Read more

15

15
Is a four week negative HIV antibody test / negative PCR test reliable?

Is a four week negative HIV antibody test / negative PCR test reliable?

HIV diagnosis: Antibody titers have been reported to be delayed as long as six months, but this is very unusual. A negative pcr for viral RNA is virtually determinative of the absence of infection. ...Read more

17

17
After implantation would a pregnancy test show positive?

After implantation would a pregnancy test show positive?

Too early to tell.: Implantation occurs about 9 days after fertilization. This is usually a bit before your next cycle is to start. Preg test usually turns positive a week or even later after implantation. If your cycle is more than 5 days late then the test is usually positive. No one can tell you exactly what day it turns positive on. Exactly when you ovulated, fertilized and implanted are all estimates. ...Read more

18

18
Does period blood test positive for drugs?

Does period blood test positive for drugs?

Possibly: If you have drugs in your system it could test +. ...Read more

19

19
Positive blood serum pregnancy test June 27. Urine tests still neg. should I be concerned?

Positive blood serum pregnancy test June 27.  Urine tests still neg.  should I be concerned?

June 27? today 6/22: I think you meant 6/17? Serum pregnancy test can detect pregnancy quite a bit earlier than the urine test can... if you tested positive on 6/17 with serum, the urine test should be coming soon.. any question/concern, consult doc. Good luck. ...Read more

See 1 more doctor answer
20

20
Clearblue.Easy.Ovulation test show pregnancy?

Clearblue.Easy.Ovulation test show pregnancy?

No: Home pregnancy tests are used to detect pregnancy and ovulation tests are used to detect ovulation. Take care. ...Read more

23

23
Is 5 days from ovulation too soon for a positive blood pregnancy test?

Is 5 days from ovulation too soon for a positive blood pregnancy test?

Defineitely: Absolutely, positively, certainly, no doubt about it yes! to be completely reliable, even a serum test should be about 11 days after ovulation. They are occasionally reliable before, but why do a test if you can't believe the results? ...Read more

24

24
Is I it possible to have negative urine pregnancy test but positive blood pregnancy test. Why do the urine test keep coming out negative?

Is I it possible to have negative urine pregnancy test but positive blood pregnancy test. Why do the urine test keep coming out negative?

Sure: That often happens if a woman is testing too soon after conception. After another week, the level of bHCG should be high enough that tests will be positive on any urine test, even a urine test after she had drank a lot of water. ...Read more

25

25
I had a positive blood pregnancy test with a 10&then the day after i had cramps but no blood then my next blood test came out negative can I pregnant?

I had a positive blood pregnancy test with a 10&then the day after i had cramps but no blood then my next blood test came out negative can I pregnant?

HCG tests: Was this a lab-run test or a home test? Usually, home quantitative HCG tests are not readily available. Assuming the two test you describe we're accurate, the negative 2nd result would indicate a loss of the pregnancy. However, one or both tests could have been inaccurate. Or, you may harbor anti anti IgA heterophile antibody which can give spurious results. Check with your gynecologist to be sure. ...Read more

26

26
I had my iud removed last week and had a positive blood pregnancy test on Monday and a negative on Thursday. Is there a chance the negative could be wrong? I feel so pregnant but not due for period for another week. What are my odds. I want to be pregnant

Testing too soon: Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about two weeks for the embryo to make enough HCG to produce a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully. ...Read more

27

27
Good mornin doctor does weak positive blood pregnancy test indicate that one is really pregnant and are there chances that it could become negative ?

Good mornin doctor does weak positive blood pregnancy test indicate that one is really pregnant and are there chances that it could become negative ?

Re do the test: If the test result was not clear, and you have not had a period, you should repeat the test in 3-4 days. Use first morning urine and follow the instructions for the test carefully. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. ...Read more

28

28
I had a weak positive blood pregnancy test but started my period the following day what does it mean?

I had a weak positive blood pregnancy test but started my period the following day what does it mean?

Follow up testing: This sounds like you need to have further testing to determine if you are pregnant or not. A blood test may be helpful in measuring pregnancy hormones. An evaluation by a provider may be necessary to determine if your bleeding is related to your period or pregnancy bleeding/spotting. ...Read more

29

29
I had a positive blood pregnancy test 6 days before my missed period i didn't think you could get a positive before implantation?

I had a positive blood pregnancy test 6 days before my missed period i didn't think you could get a positive before implantation?

Possible: It is possible but the hormone has to be a certain value to show up. It also depends on how long your cycle is. Usually it is too early to know. But that is after implantation. You can't get a positive value before implantation. It likely means ovulation occurred earlier than expected. ...Read more

30

30
What's the chances of a negative home pregnancy test and a positive blood pregnancy test before a missed period ?

What's the chances of a negative home pregnancy test and a positive blood pregnancy test before a missed period ?

The blood: pregnancy test is the gold standard. So I would go with that result. Early home pregnancy tests can sometimes detect pregnancy prior to missed period. Many regular home pregnancy tests may not show a positive prior to the missed period - as a certain level of HCG is needed to trigger a positive. ...Read more

32

32
If the first one blood pregnancy test said positive and the second one said negative can I be pregnant ? Should i take another blood test ?

If the first one  blood pregnancy test said positive and the second one said negative can I be pregnant ? Should i take another blood test ?

Yes and yes.: You can get positive followed by negative if the test was done improperly or if the pregnancy failed for any reason. Should repeat the test in a few days. The chemical detected in the pregnancy test doubles every 2 days or so should be unmistakeable in another few. ...Read more

35

35
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

36

36
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

39

39
How soon can you get a positive on a urine pregnancy test & blood pregnancy test ?

How soon can you get a positive on a urine pregnancy test & blood pregnancy test ?

Preg test: Home pregnancy tests are very accurate. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection. ...Read more

40

40
What is a reason for you to have 3 positive home pregnancy tests but a. Negative blood pregnancy test?

What is a reason for you to have 3 positive home pregnancy tests but a. Negative blood pregnancy test?

Possibilities: Here are a few possibilities: 1. You are doing the home test wrong --- letting it sit too long or have expired tests 2. You miscarried between doing a home test and taking the blood test 3. There is a lab error on your blood test. Try repeating the urine now since you have had a neg blood test. If positive then repeat the blood. Blood is the more accurate test. ...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