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Doctor insights on: What Could Cause A False Negative Pregnancy Test

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What could cause a false negative for a pregnancy test?

What could cause a false negative for a pregnancy test?

See below: The test is past its expiration date; you took the test the wrong way; you tested too soon; your urine is too diluted because you consumed large amounts of fluid right before the test; you are taking certain medications, such as diuretics or antihistaminics. If you are still concerned you may see your doctor for a blood test. http://www.webmd.com/baby/guide/pregnancy-tests. ...Read more

Dr. Adam Lewis
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


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What would cause a false positive pregnancy test?

What would cause a false positive pregnancy test?

Very unlikely: Three tests are what you are asking about and the statistics make that virtually impossible to have been a false positive. ...Read more

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What could cause a pregnancy test to give a false positive?

What could cause a pregnancy test to give a false positive?

Big cause: is letting it sit out and reading it much later than it should have been read. ...Read more

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How often could a false negative pregnancy test occur?

How often could a false negative pregnancy test occur?

Not often: Pregnancy tests are quite accurate. A pregnancy test should be accurate by about 12 days after your ovulation, so by the time your period is late the test should be accurate. ...Read more

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What could cause a "false pregnancy"?

What could cause a "false pregnancy"?

Many things: False pregnancy may be psychological. The other " false pregnancy" may be a positive pregnancy test when patient is not pregnant. For this condition one has to see a physician. ...Read more

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What could cause fake negative pregnancy results?

What could cause fake negative pregnancy results?

Not much : 1. Reading it or doing it wrong 2. Doing it to early. This can easily be solved by repeating the test two days later. If you were actually pregnant your bhcg hormone would rise enough for detection. ...Read more

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What could cause a negative pregnancy test and no period?

Many causes: At yoru age perimenopause , u can start skippimg periods, otehr causes would be hypothyroid, abnormal prolactin, so you need blood work including ovarian function tsteing and an ultarsound so you should see your gyn. ...Read more

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What causes a chlamydia test to be a false negative?

What causes a chlamydia test to be a false negative?

It's just random: Tests miss 5-10% of infections, more by urine, less by urethral or vaginal swab. Maybe other possibilities as well. Chlamydia clears on its own in a few weeks to months, so current testing is negative. Or s/he received an antibiotic for chlamydia (and didn't admit it) or for another infection, curing chlamydia or interfering with the test. Partner(s) of infected person need Rx, even w/ neg tests. ...Read more

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What could cause a false positive gonorrhea test?

What could cause a false positive gonorrhea test?

Not common: The only thing i can think of would be a mislabeled specimen, a clerical error on the lab report, or a contaminant in the lab. ...Read more

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Can anything cause a false positive on a pregnancy test?

Can anything cause a false positive on a pregnancy test?

Unlikely: Home pregnancy tests are very sensitive and can turn positive before missed period... Reccomend follow-up with md for verification... ...Read more

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What could cause no period and a negative pregnancy test?

What could cause no period and a negative pregnancy test?

Anovulation: Anovulatory cycle can mimic these symptoms. In these cycles, the ovary fails to release an egg which disrupts hormonal levels, causing the cycle to be abnormal. ...Read more

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What can cause a false positive urine hcg?

What can cause a false positive urine hcg?

Tumor: There are some tumors that produce HCG and it can cause false positive urine test. However, blood test is more likely to cause false positive result due to the presence of "heterophile" antibodies. ...Read more

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Whats the reason for a negative positive home pregnancy test result?

Whats the reason for  a negative positive home pregnancy test result?

May be too early: If you are pregnant, your HCG level is not yet high enough to the threshold that the home pregnancy test was made to detect. Many times, the HCG levels are not high enough until you have missed your period (meaning you are at least 2-3 weeks pregnant). You can do a blood test or urine test at a doctor's office (which often detects much lower levels) to confirm your pregnancy. ...Read more

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What causes pregnancy test to be negative but pregnancy be positive threw blood work?

What causes pregnancy test to be negative but pregnancy be positive threw blood work?

Pregnancy: Urine pregnancy tests may not be as sensitive as laboratory blood tests. It is likely that the hormone level was to low to be detected by the urine test. Other factors could also apply, such as test malfunction, test misread, user error, etc. Good luck! ...Read more

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What could cause a false negative on a drug test for barbiturates?

What could cause a false negative on a drug test for barbiturates?

The typical reason: is that the urine metabolite was below the "cutoff" levels for the screening which would not then be subjected to confirmation. It is not that barbituates were not in the sample, but that they were below the "positive" quantitative level for confirmation. Barbiturates are not on federally mandated testing so the cutoff level is arbitrarily assigned. ...Read more

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How common is a false negative quant blood pregnant test 3 weeks after a missed period? And what would cause the false negative?

How common is a false negative quant blood pregnant test 3 weeks after a missed period?  And what would cause the false negative?

Not often: The quant HCG is very accurate. Knowing when you ovulated is more difficult. Repeat the quant test a few days later just to be sure you didn't ovulate later than expected. You could always just repeat a urine pregnancy test. This is very accurate as well especially when using the urine from your first void of the morning as this is often more concentrated. ...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