Controversy surrounds the usefulness of the prostate serum antigen (PSA) test for prostate cancer screening and the interpretation of its results. Factors such as age, race, medical history and even the type of PSA test used can greatly affect the results and muddle the interpretation.

The Clearblue Easy +/- Results Pregnancy Test with Color Change Tip and the Clearblue Easy Digital Pregnancy Test both have fast, easy-to-read results. Each test has a display window on the front of the test stick.

A hospital pregnancy test works by detecting human chorionic gonadotropin (HCG) in either blood or urine. HCG is a hormone produced by a woman once an egg is fertilized and implants in her uterus.

According to the National Institutes of Health, pregnancy tests performed at home are about 98 percent accurate when used properly according to the package directions. Pregnancy tests detect a hormone called HCG, for human chorionic gonadotropin, which is also referred to as the pregnancy hormone.

Taking a home pregnancy test can be exciting and a bit overwhelming for many women. It's important to feel that the test will give accurate and easy to understand results. The digital pregnancy test is a huge leap forward from traditional tests that show results with a line or two, or with a plus or minus.

Think you may be pregnant? A home pregnancy test such as an EPT test is an easy way to detect the presence of pregnancy hormones in the urine. The test is 99 percent accurate in detecting the presence of pregnancy hormone. Correctly reading an EPT pregnancy test can make a life-changing difference.

The Equate Pregnancy Test, which is available at Wal-Mart for approximately $4, is a urine test that detects the pregnancy hormone known as human Chorionic Gonadotropin, or hCG, as early as the first day of a missed period.

Laboratories perform tests on blood samples and measure the results against accepted ranges. Results are used to diagnose illness, measure medication levels, help employers make hiring decisions and indicate the presence of drugs and alcohol for legal purposes.

In the first few days or weeks after conception, before most tests can detect the hormonal changes brought on by pregnancy, your body may exhibit certain pregnancy-related symptoms. Not all women have symptoms, and the majority of women only experience a few, rather than all of them.

Rapid flu tests, otherwise known as influenza rapid antigen tests, offer a quick way to see if your body is harboring a particular strain of influenza virus.

When taking a home pregnancy test, questions often arise about the results of the test, regardless of whether they are positive or negative. One common question many women have is about the impact of birth control pills on the results of a pregnancy test. Can birth control pills cause false results?

Determining whether a girl is pregnant can be difficult, particularly if the girl is young or not yet regular in her menstrual cycles.