![]() Alcohol and illicit drugs also don’t affect pregnancy test results. ![]() Importantly, most medicines will not affect the results of a home pregnancy test. Anti-anxiety medications such as prochlorperazine and trifluoperazine.Sedatives that are used before and after surgery or during labor, such as promethazine.Anti-nausea drugs, including prochlorperazine, perphenazine, chlorpromazine and promethazine.Progestin-only birth control pills, including:.The anti-seizure/anticonvulsant drug carbamazepine used for epilepsy, facial nerve pain and bipolar disorder.Antipsychotics often used to treat schizophrenia, such as perphenazine, prochlorperazine, chlorpromazine, trifluoperazine, thioridazine and thiothixene.Other drugs that may cause a false positive pregnancy test include: Taking any medication that contains hCG can cause a false-positive result.ĭrugs that contain the hCG hormone aimed at boosting fertility may impact pregnancy test results. Home pregnancy tests measure levels of human chorionic gonadotropin (hCG) hormone in urine. "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.Some medications can cause a false positive pregnancy test result. “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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