Pregnancy test stick
Pregnancy Test Kit is a home diagnostic tool used to detect whether a woman is pregnant. It is usually diagnosed by testing human chorionic gonadotropin (hCG) levels in the urine. hCG is a hormone produced by the placenta after a fertilized egg implants, and usually begins to appear in the urine about a week after conception.
How to use pregnancy test stick
The exact steps for using a pregnancy test may vary depending on the brand and model, but the following are general guidelines:
1. Choose the right time: The best time to test is usually when the first day of the menstrual cycle is not expected to arrive, or at least wait a few days after sex to ensure there is enough time for hCG levels to rise while rising.
2. Collect urine samples: Urine samples from the first urination in the morning are usually required because the concentration of hCG is highest at this time. Collect urine according to instructions.
3. Take a test: Depending on the type of pregnancy test stick, there are two common testing methods:
Immersion method: Dip the absorbent end of the pregnancy test stick (usually labeled \”test area\” or \”absorbent pad\”) into the collected urine to the depth and time specified in the instructions.
Urine drip method: Using the dropper or other tool provided, place a few drops of urine directly onto the designated area on the pregnancy test stick.
4. Wait for the results: Place the pregnancy test stick flat on a clean surface, and then wait for a certain amount of time according to the instructions, usually a few minutes. Do not exceed the recommended maximum wait time as this may cause incorrect results. 
How to read a pregnancy test stick
Most pregnancy tests display the results in the test window. So what do you think of a pregnancy test stick? It is most important to understand the results of the pregnancy test, mainly as follows:
Two lines or a plus sign: Indicates pregnancy (even the second line, which is very faint, is considered a positive result).
One line: Indicates not pregnant.
No lines or invalid display: It may be because the test method is incorrect or the pregnancy test stick is invalid and needs to be retested. 
Why does the pregnancy test stick show one light and one dark color
A pregnancy test showing two lines, one dark and one light, usually indicates a weak positive result, which means human chorionic gonadotropin (hCG) has been detected in the urine, but the concentration may be low. There may be several explanations for this situation:
Early pregnancy: If you have just missed your menstrual cycle, it may be because your pregnancy is still short and hCG levels are not high enough, causing the second line to be lighter in color. As time passes and hCG levels rise, the second line may become deeper.
Ectopic Pregnancy: In some cases, such as an ectopic pregnancy, hCG levels may increase at least slower than in a normal pregnancy, which may also lead to mixed results.
Miscarriage or embryonic development problems: If hCG levels are unstable or declining, it may be due to miscarriage or embryonic development problems.
Improper testing time or method: If the test is performed at a non-optimal time (for example, not using the first urine in the morning), or the testing method is incorrect, it may also lead to different results.
Pregnancy test stick issues: Occasionally, a pregnancy test stick may be defective or expired, which can also cause unclear results.
What are the precautions for using pregnancy test stick
1. Before taking a pregnancy test, be sure not to drink too much water in order to increase urine, because this will dilute the hormone levels and affect the overall success rate.
2. Morning urine usually contains the highest concentration of hCG, so it is recommended to use the first urine in the morning for testing to improve the accuracy of the test.
3. Pregnancy test sticks are usually for one-time use. Do not reuse the same pregnancy test stick for multiple tests.
4. Before using it at the same time, you should also pay attention to check whether the pregnancy test stick has expired. Judge it by the production date on the box. Generally, the chemical agents in expired test cards will become invalid after a long time.
