Pregnancy Test Strip
What is Pregnancy Test Strip?
A pregnancy test strip is a medical device that is used to determine whether a woman is pregnant or not. It works by detecting the presence of a hormone known as human chorionic gonadotropin (hCG) in a woman's urine. As the level of hCG rises in a woman's body after conception, the test strip reacts by producing a positive or negative result. The test strip is usually small in size and easy to use, with clear instructions for interpreting the results. It is a common and convenient method of confirming pregnancy at home or in a medical setting.
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Benefits of Pregnancy Test Strip
Early detection
Pregnancy test strips can detect pregnancy as early as five days before a missed period, giving the woman time to make necessary lifestyle changes or seek medical attention if necessary.
Cost-effective
Pregnancy test strips are affordable and readily available, making them accessible to all women, regardless of income or location.
Accurate
Pregnancy test strips have a high degree of accuracy, with many tests claiming a 99% accuracy rate, reducing false negatives and the chance of a woman believing she is not pregnant when she is.
Easy to use
Pregnancy test strips are simple to use and require only a few steps, making them a convenient option for women who prefer to test at home.
Non-invasive
Pregnancy test strips are a non-invasive way to confirm pregnancy, without the need for blood tests or invasive medical procedures.
Confidentiality
Pregnancy test strips offer privacy and confidentiality, enabling women to confirm pregnancy without revealing their status to anyone else.
From the earliest moments of conception, your body starts to undergo monumental changes. One of the very first signs of being pregnant is your body's production of the pregnancy hormone, hCG (human Chorionic Gonadotropin), which can be detected in your blood and in your urine.
The amount of hCG in your body increases rapidly. It doubles every 36 to 48 hours as your pregnancy progresses, reaching its peak at eight to ten weeks. Pregnancy tests work by detecting the hCG hormone in your urine. When your urine comes in contact with the specially treated strip on a pregnancy test stick, results appear within minutes, indicating whether or not hCG, the pregnancy hormone, has been detected.
What happens when the pregnancy test detects the hCG hormone differs slightly by the brand and type of test. The basic way pregnancy test kits work is the presence of the hCG hormone creates a reaction within the test strip, which is then displayed as positive or negative results. Most tests have a results window and after a few minutes of contact with your urine will show two lines or a plus sign if you are pregnant, and a single line or minus sign if you are not.
Throughout history there have been many different types of pregnancy test. Up until the early 1900s, the best method of diagnosing pregnancy remained close observation of symptoms, e.g. morning sickness. It wasn't until the early 1930s that the first clinical biomarker was found. This was a protein present in the urine of pregnant women, human Chorionic Gonadotrophin (hCG).
The first modern pregnancy tests were developed based around an immunoassay (a method of detecting particular proteins) using a reaction between an antibody protein and its respective antigen protein. This allows the calculation of the amount of hCG protein in a sample. The original tests contained multiple test tubes that the sample had to be filtered into. It wasn't until later that decade that the first available home testing kits became available, and it was yet another two decades before the modern stick-style pregnancy test was engineered and marketed.
How do pregnancy tests work?
For some women, the first signs of pregnancy come before the use of a pregnancy test. This can be in the form of tiredness, a missed period, or even nausea and vomiting. Home pregnancy tests can confirm the suspicions these may generate, with a claimed 99% accuracy. The most reliable results come a week after a missed period. However, some pregnancy tests can confirm that you're pregnant earlier than this, as early as 8 days after conception.
Pregnancy tests work by detecting the presence of the hormone, human chorionic gonadotropin (hCG). hCG is a hormone produced by cells in the placenta. Its production starts from the point at which the developing embryo attaches to the uterus, 6-12 days after conception.
hCG's primary role is to support the function of the corpus luteum, a temporary structure in the ovaries. The corpus luteum is essential during pregnancy. It produces the important hormones, estrogen and progesterone. Progesterone relaxes the muscular wall of the uterus and prepares its tissue lining so that the embryo can implant. Estrogen is key for the development of the foetus, stimulating organ growth and thickening the lining of the uterus.
hCG concentration increases from conception, and peaks between 8-11 weeks after conception. For the first few days after conception, its levels can be too low to be detected by pregnancy tests. After implantation its levels double approximately every 48 hours, making it much easier to detect.
hCG is eliminated from the mother's body through urine, and this is what pregnancy tests use to detect it. Urine is applied to a sample pad at the end of the test stick and is drawn up the strip. The first area it reaches is the reaction zone. If hCG is present in the urine, here it binds to proteins called antibodies. These antibodies have an enzyme attached to them which can participate in reactions further along the test strip.
The test zone contains different antibodies which are attached to the strip and unable to move. These antibodies also bind to hCG, creating something of a hCG sandwich between the two different antibodies. The enzyme on the mobile antibodies triggers a colour change in dye molecules on the test strip. This line only appears if the urine contains hCG–and hence, if the woman is pregnant. If there's no hCG, the mobile antibodies just sail on past.
Whether the woman is pregnant or not, another line appears on the test in what's known as the control zone. Here, more immobile antibodies bind to the excess mobile antibodies that didn't pick up hCG and continued travelling up the strip. Again, this triggers a colour change. This proves that the test is functioning correctly–whether a woman is pregnant or not, the control line should show.
Digital pregnancy tests have become more common in recent years. Though these may look different from the outside, they work in exactly the same way. They simply use a sensor to detect the colour changes and determine whether to display ‘pregnant' or ‘not pregnant' on their screens.
Though home pregnancy tests seem commonplace now, they were only developed in the 1970s. Prior to this, tests had to be carried out in laboratories. These laboratory tests were developed less than 100 years ago and were initially somewhat weirder than today's methods. The first test which could accurately detect pregnancy involved injecting a woman's urine into several immature female mice. If the woman was pregnant, the ovaries of the mice would grow and produce eggs. Later developments of this test substituted frogs for the mice, in what became the first widely used pregnancy test. Waiting for results took up to a week–a far cry from the mere minutes home pregnancy tests operate in.
Even these first laboratory tests weren't as odd as some of the methods used to predict pregnancy prior to their development. In the Middle Ages, uromancers (given the fantastic nickname of ‘piss prophets') tried to divine whether a woman was pregnant. They did this via a number of methods, including whether a woman's urine rusted a nail or changed the colour of leaves. It's likely none of these methods were particularly effective.
How to Use Pregnancy Test Strips?
Pregnancy test is a quick test method that is also known as One Step HCG Urine Test which you can manually without any difficulty. Pregnancy test strips checks the presence of HCG (human chorionic gonadotropin), which comes in urine very early for the duration of pregnancy. There are some steps for using test strips which is very useful for the women.
The first step is to take a clean, dry and glass or plastic container to collect the woman's urine. After that, women contain urine in the container. Thus, it is important that pregnancy test strip and urine have to be room temperature at 15-30°C for pregnancy testing.
It is need to remove the hcg test strips from the conserved pouch and Dip the strip in the urine through the arrow point to the urine. It is very important that do not let the urine level to go above the maximum line; otherwise the test will not do properly.
After that, Take the home pregnancy test strip out after 3 seconds and put down the strip smooth on a clean, dry, non absorbent place or surface. You can read and check results in 5 minutes but do not read outcome after more than 5 min. This test detects the presence of hcg hormone in the urine.
When the hcg test strip is absorbed into a urine sample, capillary act carries the sample to transfer along the covering. When hcg in the taster makes the Test Zone area of the covering, it will appear a colored line. But not appear of this colored line recommend a negative result.
After 5 min, if only one color band looks in the strip that indicates the test is negative means no pregnancy has been identify. If two color band lines are appear in the strip that means test is positive that you are pregnant. The color power of the pregnancy test bands may differ since several levels of pregnancy have different focus of HCG hormone. If no color line appears in the strip that mean your test is fails or invalid so you can repeat test by a new test kit..
When a test result is inaccurate, it's either a false negative (the test says you are not pregnant, but you are) or a false positive (the test says you are pregnant, but you aren't). Several factors can cause false negative results:
Having urine that is too diluted after drinking a lot of water or testing later in the day.
Testing too soon when there has not been enough time for a fertilized egg to implant and start hCG production.
Using a pregnancy test that doesn't detect lower levels of hCG. You can check the package insert for more information about the level at which the test will be positive.
Sometimes an egg will implant briefly but will not be sustained. This is also called a chemical pregnancy – hCG is produced, but the pregnancy doesn't continue. A test performed several days before an expected period can show a positive result, but the woman still gets her period soon or on time. Rarely, certain tumors can produce hCG, causing a pregnancy test to be positive even when a woman is not pregnant.
How to Read the Result of Pregnancy Test Kit?
Test pack tool works by detecting the presence or absence of the hormone Human Chorionic Gonadotropin (HCG). HCG is a hormone that indicates that you are pregnant. HCG hormones are molecules that were first synthesized by embryos in the womb.
Generally, in every packaging of the test tool, there will be instructions on how to read the test results—ways to find out whether the test pack is positive or negative. Test Pack Results in Positive means pregnant. On the contrary, the results of a negative test pack mean not pregnant.
Each test pack has a different way of showing positive and negative results. Generally, a positive sign can be demonstrated by a plus (+) sign, two vertical lines, or even the word "pregnant".
Conversely, a negative sign can be shown by the appearance of a minus (-) sign, a vertical line, or the word "not preg" (short for not pregnant). Because of this difference, make sure you read instructions correctly. Also, ensure you do not wait too long for the test pack results. Test pack results that appear too long (more than 3-10 minutes) are likely inaccurate.
If the test pack shows you are positive for pregnancy, stop smoking and drinking alcoholic drinks, and immediately make an appointment with a doctor for further examination.
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Founded in 2019, SUSMED is an ONE-STOP medical, laboratory and Consumables supplier in YANGZHOU, China. ,SUSMED engages in offering our customer one-stop solutions in the medical field, supplying competitive price and top quality products to more than 200 hospitals, clinics, and universities in over 100 countries. SUSMED is located in Yangzhou, a famous scenic city, only 4 hours' drive from Shanghai airport. Since its establishment, the company has been committed to the R & D, production and operation of medical consumables products based on independent research and development, cooperative research and the combination of production, teaching and research mode, constantly seeking the development and innovation
FAQ
Q: What is a pregnancy test strip?
Q: How do I use a pregnancy test strip?
Q: How accurate are pregnancy test strips?
Q: When is the best time to take a pregnancy test strip?
Q: Can I use a pregnancy test strip if I am not sure of the date of my last period?
Q: Can medications and certain medical conditions affect the accuracy of a pregnancy test strip?
Q: Can stress impact the results of a pregnancy test strip?
Q: Can a pregnancy test strip provide a false negative result?
Q: Can a pregnancy test strip provide a false positive result?
Q: Can a pregnancy test strip provide results for multiple pregnancies?
Q: How long does it take for results to appear on a pregnancy test strip?
Q: Can I reuse a pregnancy test strip?
Q: Can a partially formed line on a pregnancy test strip indicate pregnancy?
Q: Can high levels of hCG indicate a problem with the pregnancy?
Q: Can a pregnancy test strip detect early pregnancy?
Q: Can I use a pregnancy test strip if I am on birth control?
Q: Can a pregnancy test strip be used during menopause?
Q: How long do I have to wait before taking another pregnancy test strip if the first test was negative?
Q: How much does a pregnancy test strip cost?
Q: Is a pregnancy test strip more accurate than a traditional home pregnancy test?
