Pregnancy Test Kit: How Accurate Is It?
If you suspect you're pregnant, when should you take the urine pregnancy test? Just how accurate are these over-the-counter test kits? Experts from the Department of Obstetrics & Gynaecology, KK Women's and Children's Hospital answer your questions.
For accuracy, you should take your pregnancy test using your first morning urine.
Continued from previous page.
A pregnancy test kit works by detecting the amount of human chorionic gonadotrophin (hCG) in urine. The Department of General Obstetrics and Gynaecology (O&G), KK Women’s and Children’s Hospital (KKH), a member of the SingHealth group, explains more.
A pregnancy test kit is rarely wrong. It is more than 99 per cent accurate. 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.
“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.
There are rare examples when the hCG level is raised transiently and then drops to zero. This is known as a “biochemical pregnancy” and could be the cause of a false positive result of the test kit. However, this initial rise of the hCG level will soon drop in a “biochemical pregnancy” and result in a negative urine pregnancy test.
“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.”
"The New Art and Science of Pregnancy and Childbirth", a pregnancy book by KK Women's and Children's Hospital (KKH), a member of the SingHealth group.
Find out how pregnancy test kits work on the previous page.
Ref: S13
If you have any questions on hcg pregnancy test strips. We will give the professional answers to your questions.