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Physiological basis of various pregnancy tests

What is a pregnancy test?
A pregnancy test is a way to determine if you’re pregnant. If your pregnancy test is positive, it means you’re pregnant. If the test is negative, it means you aren’t pregnant. Pregnancy tests work by detecting human chorionic gonadotropin (HCG), a hormone your body makes when you’re pregnant.

From the very beginning of pregnancy, your body starts to go through changes to support the cells that will develop into your baby. One thing that happens very quickly is the production of HCG. If you’re pregnant, your body starts to produce more HCG. Your HCG levels start to build up once the fertilized egg implants in your uterus — about six to 10 days after conception.

There are two main types of pregnancy tests — urine tests and blood tests. Often, you’ll take a urine test at home with a home pregnancy test. This type of test is available over the counter (you don’t need a prescription from your healthcare provider) and in a variety of price ranges. Blood tests to check for pregnancy happen in your healthcare provider’s office and involve giving a sample of your blood. The other way to confirm a pregnancy is by using an ultrasound. Your provider performs an ultrasound in their office.

There are several reasons why you might take a pregnancy test. You could be trying to get pregnant and hoping for a positive result. You might have experienced an issue with your birth control. You might even be about to have a medical procedure or start a new medication that could be complicated by pregnancy. No matter what the reason, if you ever have any questions about your test results, the best thing to do is reach out to your healthcare provider.

What hormone levels are checked for a pregnancy test?
Pregnancy tests look for an elevated amount of HCG. Levels of HCG rise quickly – doubling every few days in the first weeks of pregnancy. The placenta produces HCG. Only pregnant people have a placenta, which develops shortly after a fertilized egg attaches to your uterine wall.

When should I take a pregnancy test?
If you think you could be pregnant, it’s a good idea to take a test and make sure. Home pregnancy tests can differ in how early they’ll detect a pregnancy. In many cases, you might get a positive result from an athome test as early as 10 days after conception. For a more accurate result, wait until after you’ve missed your period to take a test. Remember, if you take a test too soon, it could be negative even if you’re pregnant. If you get a negative test and then miss your period, take another test.

What time should I take a pregnancy test?
In general, the best time is when you have your first morning pee. However, some pregnancy tests are sensitive enough to detect HCG no matter what time of day you take the test. When possible, try to wait until it’s been three hours since your last pee before you take the test. You could also take two pregnancy tests to confirm you get the same result.

TEST DETAILS

How do pregnancy tests work?
When you take a pregnancy test, it’s looking for the amount of human chorionic gonadotropin (HCG) in your body. You can find HCG in your pee or blood. HCG needs time to build up in your body. Each day of early pregnancy, your body will create more HCG. As the weeks go on, you’ll have more and more HCG in your body, which will make it more likely that a pregnancy test will show as positive. This means if you take a test too soon, it will come back negative.

Pregnancy tests work by reacting to the amount of HCG in either your pee or blood. In a urine test, a piece of reactive paper detects the HCG. This test might show a plus sign, double vertical lines or even the word “pregnant.” Different tests will show a positive result in unique ways. Read the directions that come with the test to know what a positive result will look like. For example, most tests have a control window that shows up first. Seeing a symbol in this window will tell you that the test is working. Keep in mind that different brands of tests will take different amounts of time to show a result.

If you take a blood test, your provider will take a sample of your blood and send it to a lab. The lab will determine the amount of HCG in your blood. Your provider will contact you with your results.

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