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Related Articles. How to Avoid a Pregnancy Test Error. The 8 Best Pregnancy Tests of An Overview of Home Pregnancy Tests. Tests read after 10 minutes may be inaccurate or show evaporation lines. Learn more about evaporation lines here. HCG tests are more likely to produce false negatives than false positives.
The longer after implantation a person waits to do the test, the more accurate it will be. HCG levels begin rising when an embryo implants in the uterus. Implantation usually happens a week or so after ovulation. It can take several days for HCG levels to rise high enough for a test to detect the hormone. Due to how long it takes for HCG levels to rise, it is possible for a woman to be pregnant and still get a negative test.
A positive result usually appears after retesting a few days later. False-positive results are rare. However, because home pregnancy tests are increasingly sensitive, some can detect very early pregnancies with low HCG levels. This sensitivity means it is possible to have a positive test that a very early miscarriage then follows. A woman who delayed testing or who used a less sensitive test might not have known about the miscarriage. In rare cases , a woman can have abnormally high levels of HCG even though they are not pregnant.
The most common reasons for this include:. In addition to testing too early, the following factors can cause a false negative with a urine HCG test:. Tests that have passed their expiry date may produce false positives or negatives. Reused tests are not accurate. HCG tests are very safe. The urine test is risk-free. The blood test can cause brief pain and occasional bruising at the puncture site. A qualitative test detects if hCG is present in the blood.
A quantitative test or beta measures the amount of hCG actually present in the blood. Want to Know More? Food and Drug Administration www. Can I get pregnant if…? Share this post:. Share on facebook Facebook. Share on twitter Twitter. Share on linkedin LinkedIn. Share on email Email. Similar Post. Pregnancy Loss. For most tests, it only takes about 5 to 10 minutes for a result to appear. Typically, a colored line or plus symbol will appear on the test stick to indicate a positive result.
The absence of a colored line or a negative sign usually indicates a negative result. If you have a negative result, you should consider these results to be uncertain, as they may indicate a false negative. Smoking, using alcohol, and taking certain medications can harm your baby in early pregnancy. If you have a negative result, repeat the test in about a week to confirm the absence of pregnancy. They can conduct an hCG blood test , which is more sensitive to lower levels of the hCG hormone than the hCG urine test.
If you have a positive result, it means that the test detected hCG in your urine. Your next step should be to consult your doctor. They can confirm pregnancy with an exam and additional testing, if necessary. Getting prenatal care early in your pregnancy gives your baby the best chance for healthy growth and development before and after birth. What are the telltale early symptoms of pregnancy? Every person is different, but here are a few top signs.
False positives and negatives can occur for a…. Trying to figure out if you need to take a pregnancy test?
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