![]() ![]() The more hCG your body makes, the more likely you are to get a positive result. In just two days, your hCG levels will usually double. Since it would be really early in your pregnancy, you may not have enough hCG for the test to detect yet. We recommend taking another test in a few days. If you get a negative result and tested more than three days before your expected period, you could still be pregnant (see chart). For the most accurate results (over 99%), test three days before your expected period. You can use either a midstream test or pregnancy test strips starting five days before you expect your period to start. hCG is the first detectable sign of pregnancy, and home tests (like the Natalist Pregnancy Test) are an easy and reliable way to determine if you’re pregnant. Pregnancy tests detect a hormone called human Chorionic Gonadotropin (hCG), which can be detected in urine or blood after an embryo implants itself into your uterine wall. "The New Art and Science of Pregnancy and Childbirth", a pregnancy book by KK Women's and Children's Hospital (KKH), a member of theįind out how pregnancy test kits work on the previous page.Have questions about using an at-home pregnancy test? We’ve got all your answers.īy Halle Tecco, MBA, MPH How does a pregnancy test work? “Occasionally, we need to follow-up the hCG levels to help us diagnose early ectopic pregnancy (pregnancy outside the womb), which could be potentially life-threatening,” says A/Prof Tan. These tests may be useful to differentiate a miscarriage when the blood hCG will drop with time, or a healthy pregnancy when the blood hCG level will double every two days. Do I need a blood test for hCG to confirm my pregnancy?īlood tests for hCG are more accurate and they can also measure the actual levels of the hormone.You can test your urine as early as six days past ovulation, but the first day of your missed period is recommended for greatest accuracy. When should I take the test if I suspect that I am pregnant?.Do I have to test with first morning urine?Īlthough you can test any time of the day, your first morning urine specimen is usually the most concentrated of the day and would have the most pregnancy hormone in it.“In a ‘biochemical pregnancy’, vaginal bleeding will occur soon after, which will coincide with ‘delayed menses’. Rarely, there could be ovarian tumours which secrete hCG and the false positive result could be wrongly interpreted as a pregnancy.” Pregnancy test kits: Frequently asked questions However, this initial rise of the hCG level will soon drop in a “biochemical pregnancy” and result in a negative urine pregnancy test. This is known as a “biochemical pregnancy” and could be the cause of a false positive result of the test kit. ![]() There are rare examples when the hCG level is raised transiently and then drops to zero. “So, if a test comes back negative but you strongly suspect that you are pregnant, repeat the test in a few days’ time,” advises the Department of O&G. Thus, if your test is negative, it means that you are not pregnant However, if you are very early in your pregnancy and the test is done far too early, there could be an insufficient amount of urine hCG for the test to detect. How accurate are pregnancy test kits?Ī pregnancy test kit is rarely wrong. KK Women’s and Children’s Hospital (KKH), a member of the The Department of General Obstetrics and Gynaecology (O&G), A pregnancy test kit works by detecting the amount of human chorionic gonadotrophin (hCG) in urine. ![]()
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