A pregnancy test can confirm if a female is pregnant. The test can be carried out at home or in the doctor’s office. It works by measuring levels of a hormone called human chorionic gonadotropin (HCG).
A pregnancy test is around 99% reliable. It works by measuring levels of HCG in either the blood or urine. HCG can be present in the blood and urine approximately 10–14 days after conception.
If a female misses a period or other signs suggest she may be pregnant, it is a good idea to take a test.
A female should know as early as she can if she is pregnant, as she will probably need to monitor her health more carefully, and she may need to make some lifestyle changes.
Fast facts on pregnancy tests
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A pregnancy test is 99 percent accurate at letting a woman know if she is pregnant.A pregnancy test works by measuring the amount of HCG hormone. HCG levels increase during pregnancy.
HCG is known as the pregnancy hormone, because it is produced by the cells that form the placenta and provide nourishment to the growing embryo.
It is released when a fertilized egg attaches itself to the lining of the uterus.
HCG can be present in the blood and urine around 10 to 14 days after conception. It peaks between 8 and 11 weeks of gestation.
Pregnancy tests involve testing urine or blood. A urine test can be self-administered at home, but a medical professional must perform a blood test.
A home test involves placing the urine on a chemical strip. The result is ready in around 1 to 2 minutes, although different brands of test may vary in the result times.
The individual collects urine in a container and either dips the pregnancy test stick into it or uses an eyedropper to place the sample on the test strip.
Alternatively, a pregnancy stick can be held in the urine stream.
Each brand of testing has its own way of giving results, so it is important to read the package insert to find out how to understand the results.
Depending on the test, the result may appear as:
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A blood test can be a more accurate and detailed way to confirm pregnancy. However, a healthcare professional will need to administer this.There are two ways to check for pregnancy using blood: a quantitative and qualitative HCG test.
Blood testing has some advantages.
It allows for early pregnancy detection, and it can measure HCG concentration.
However, it is more expensive, the results can take time, and the test must be completed in a medical office.
The earliest time for taking a home urine test is 14 days after possible conception, but waiting until a missed period will give a more reliable result.
Some tests on the market can be taken earlier. This depends on how sensitive they are.
It is important to read the package insert to know the best and earliest time to take the test.
The best time of day to take a urine pregnancy test is first thing in the morning, after waking.
This is because consuming a lot of liquids before taking the test, can lead to a false negative, even if the female is pregnant.
Used correctly, a urine pregnancy test should be around 99 percent accurate. However, incorrect use can result in an inaccurate reading.
A positive home pregnancy test simply means that HCG is present in the urine, while a negative test can have a variety of meanings.
Negative tests can mean that there is no pregnancy, or they can mean that the test was either taken too early to detect HCG, or that it was not done correctly.
If the result is positive, the female should make an appointment to see a healthcare professional, who can guide her about the next steps.
If the result is negative, but the female has the signs and symptoms of pregnancy, she should test again after 1 week or ask a doctor about a blood test instead.
Some modern pregnancy tests and kits can give an estimate of the conception date and consequent due date. However, this information is not always accurate.
Some medications can affect a pregnancy test’s accuracy.
These include:
Alcohol in the blood stream does not affect the pregnancy test because it does not interfere with the measurement of the hormone levels.
However, anyone who is trying to or expecting to become pregnant should avoid alcohol, as it can affect fetal development. Drinking during early pregnancy can increase the risk of miscarriage, premature birth, and low birth weight.
Sometimes, there may be a positive test result but the female is not pregnant. High HCG can also indicate that some health condition has increased levels of the hormone.
This could be:
HCG can rise as a result of some types of cancer. These are transitional cell carcinoma of the bladder and urinary tract, prostate cancer, renal cancer, and cancers of the gastrointestinal system. A pregnancy test may be used to assess for these.
Pregnancy tests are available at drugstores, pharmacies, and some convenience stores. Home pregnancy tests can be purchased for as little as a dollar, and some health centers offer them free of charge.
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