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Home and Clinic Pregnancy Tests


Do you think you may be pregnant? Here are a few tips about your pregnancy testing options...


What Is a Pregnancy Test?    TOP

Pregnancy tests detect a hormone called human chorionic gonadotropin (hCG) in a sample of urine or blood. This hormone HCG is produced by the placenta and is found in pregnant women. The amount of hCG produced during early pregnancy doubles every 2-3 days and peaks at 7-10 weeks. You can be tested for pregnancy with an over-the-counter pregnancy test or in your healthcare provider's office.


How Soon After Conception Will a Home Pregnancy Test Work?    TOP

Some, but not all, home pregnancy tests can detect pregnancy as early as 1 day after a missed menstrual period. Most home pregnancy tests are very accurate when done about a week after your first missed menstrual period.


How Are Pregnancy Tests Done at Home?    TOP

There are several different types of home pregnancy tests that are readily available at your local drug store. Because there are many brands, it is important to follow the directions on the individual package carefully.

Some tests require that you urinate directly on a stick, while others ask that you urinate in a cup and then place a small sample into a testing well with a dropper. The results can be as fast as a few minutes or as long as a several hours. Keep in mind that results are displayed differently with different tests as well. For example, some show a red plus or minus sign in a window, others show pink or blue lines on a test strip, while others change the color of a urine sample.

Once you get a result, you may begin to question the test's accuracy.


How Accurate Are Pregnancy Tests?    TOP

Home pregnancy tests are not 100% accurate. Many manufacturers claim to have a 99% accuracy rate, but inaccurate results may be more frequent. This is because of improper use of the test, using the test after its expiration date, exposure of the test to the sun, and other factors. Again, make sure to follow the directions of your particular test exactly as you are supposed to. This should help make the test more accurate.

After conception, a woman produces a minimal amount of hCG. Not all tests are strong enough to pick up the amount of hCG hormone present the first time. Later tests may be positive. Whatever the result or the brand used, most manufacturers recommend repeating the process several days later to confirm the results.

Other potential problems include:

  • It is possible that you may get a negative test even if you are pregnant (false negative) if you take the test too early after conception, before hCG levels are significant.
  • If you are taking medications that has hCG in them, you may get a positive test even if you are not pregnant (false positive).

How Are Pregnancy Tests Conducted in a Medical Office?    TOP

Either a urine test or blood test is available at your healthcare provider's office or a family planning clinic. For the urine test, a urine sample is taken, usually first thing in the morning.

A blood hCG test involves taking a sample of blood from a vein in the arm. A blood test may be ordered to measure how much hCG is in the blood. The blood test can detect a pregnancy earlier than the urine test. Results of these pregnancy tests may be available the same day they are administered.

If your test is positive, make sure you follow up with your healthcare provider right away. You cannot start prenatal care too soon.


Family Doctor—American Academy of Family Physicians
Office on Women's Health


Women's Health Matters


Knowing if you're pregnant. Office on Women's Health website. Available at:
...(Click grey area to select URL)
Updated September 27, 2010. Accessed December 11, 2012.
First trimester: Pregnancy testing. American Association for Clinical Chemistry Lab Tests Online website. Available at:
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Updated June 4, 2014. Accessed December 9, 2014.
Routine prenatal care. EBSCO DynaMed website. Available at:
...(Click grey area to select URL)
Updated December 4, 2014. Accessed December 9, 2014.
Last reviewed December 2014 by Michael Woods, MD
Last Updated: 12/9/2014

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