Pregnancy Tests

November 12, 2012

Pregnancy Tests

Your pregnancy begins when the embryo gets implanted into your womb. This triggers the formation of placenta, responsible for supplying nutrients and blood from the mother to the developing fetus. The placenta also produces the human chorionic gonadotropin, or hCG, hormone.


Gone are the days when a woman had to wait for a doctor’s appointment to confirm her pregnancy. If you are noticing early pregnancy symptoms and are anxious about them, consider taking a pregnancy quiz. Many websites offer free questionnaires, which analyze your symptoms and declare the probability of your pregnancy. If your quiz results are positive, or if you are unsure of them, you can move on and take the home pregnancy test.

There are several different home pregnancy tests in the market today. You can buy them at a local drug store without any prescription. All pregnancy tests come with clear and simple instructions and illustrations. You are simply required to add your urine sample to the test strip, and wait for a few minutes. Most tests recommend using the early morning urine sample as it is rich in hCG. You should always wait for 2 hours before repeating the test. This is the time required for the hormone levels to rebuild in your urine sample.

How Do They Work?

As stated earlier, your body produces large quantities of hCG in the early stages of the pregnancy. Most home pregnancy tests have been designed to detect the presence of hCG in your urine. The test strips are coated with anti-hCG antibodies. If your urine sample contains the hormone, it will combine the antibodies on the strip to form antigen-antibody complexes. These complexes produce the positive result.

Each test has its own way of displaying the results. While some of them may indicate the positive results with two lines, other may express the results in form a plus or a minus sign. Read the instruction manual carefully to understand how your test works. Most pregnancy tests recommend a urine sample from the first day of your missed period. Women with irregular menstrual cycle may find it difficult. They may just have to guess the date.

Interpretation of the Results

Most home pregnancy tests are accurate and reliable, especially if you follow the instructions correctly. False positives are rare. A positive test result is almost certainly correct. A negative test may, however, occur if:

  • You are not pregnant
  • Did not follow instructions properly
  • Take the test too early

Certain medications such as promethazine, Parkinson’s disease medicines, hypnotics, tranquillizers, diuretics, anticonvulsants, and infertility drugs may interfere with the results as well. You should talk to your doctor if the results are positive. You may also talk to a health care professional if you are unsure of your negative results, or if your pregnancy symptoms persist.

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