Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier
WebMD

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine
WebMD

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion
    WebMD

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community
    WebMD

    Community

    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Why Maybe False Negative.
avatar
phoenixfire76 posted:
Home Pregnancy TestsHuman Chorionic Gonadotropin (hCG) pregnancy tests or home pregnancy tests determine pregnancy through the detection of the hormone Human Chorionic Gonadotropin (hCG) in a woman's urine. Doctors recommend that you wait until you have missed a period to take a home pregnancy test. If you can not wait that long to find out and you know the day you may have conceived, then the earliest you can take a test would be 14 days from possible conception. Home tests are usually 97% accurate when all instructions are followed correctly and the results are read on time. Some kits come with two tests so that in case you have made a mistake, you may take the home pregnancy tests gain. Learn more about the accuracy of home pregnancy tests in another relevant article.
False Negative hCG Pregnancy Tests And What Causes ThemIf you take a home pregnancy test too early, you may get a false negative result. A false negative result is when the test says you are not pregnant but you are. This can be misleading and when using home pregnancy tests you must be very careful of avoiding any factors that may cause false results.
The major reason for a false negative test is that you took the test too early. Pregnancy tests vary in their sensitivity which means how soon they can detect the hormone Human Chorionic Gonadotropin (hCG) in your urine. It is possible that although your ovum might be fertilized, meaning you may be pregnant, but your body has not started secreting enough Human Chorionic Gonadotropin (hCG) for the test to measure. Your body needs time for the hormone to rise to a high enough level to be detected in a test.
If the home pregnancy test shows negative results but you still think you could be pregnant, wait a few days and try again. A negative result can mean that you are not pregnant, you took the test too early or you took the test wrong. Also, if you have received different answers on multiple pregnancy tests, it is recommended that you get a blood test done to get an accurate answer.

For most pregnant women the urine pregnancy test does not detect enough hCG until 1-2 days before missing the period. And in 1 of 4 pregnant women the home urine pregnancy test does not become positive until after they miss their period. Most false negative pregnancy tests occur when testing is done too early. You are pregnant but you test negative because there is not enough of the pregnancy hormone hCG in your body and especially your urine to be detected.
Check your chances of being pregnant or not with a negative pregnancy test HERE.
Quantitative blood tests and the most sensitive urine tests usually detect hCG shortly after implantation, which can occur anywhere from 6 to 12 days after ovulation. Beta hCG levels rise exponentially in the first two months or so of pregnancy so the earlier the test is performed, the higher the chance of a false negative result. Less sensitive urine tests and qualitative blood tests may not detect pregnancy until three or four days after implantation. Menstruation occurs on average 14 days after ovulation, so the likelihood of a false negative is low once a menstrual period is late.
Was this Helpful?
58 of 79 found this helpful
Reply
 
avatar
blueidmom3 responded:
I took a pregnancy test at the Dr. office before I started Devo-Provera and it came out negative. Four weeks later I tested positive with a HPT. When I got an ultrasound to determine the correct gestational age of the fetus, it was 11 weeks. Meaning I was already 6 weeks along when the professional pregnancy test "lied" to me.
 
avatar
shellhart03 replied to blueidmom3's response:
the test at the Dr. office... was it a urine or blood test? Just wondering.
Congrats on the baby! I hope you are having a wonderful pregnancy!!!
 
avatar
sagegoodenough responded:
i've taken 3 HPT's and all came out negative, but i feel pregnant, my belly is growing, and i'm feeling fetal movement (not like gas or digestion, i have two other kids as well) i'm also on mirena and have heard other people with mirena in who have gotten pregnant have had false negatives with HPT's and it took a blood test to prove they were, i look about 3-5 months along right now.


Spotlight: Member Stories

Married to my wonderful husband for three years. We have been together 6 years. Proud parents to two little boys ds 4 and ds 2....currently trying for...More

Helpful Tips

Just curious.
Hello, this is my first post on here. I'm really just wondering what your thoughts are on this. My DH and I are currently TTC, I have a ... More
Was this Helpful?
1 of 2 found this helpful