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A 41-year-old member asked:

Can the home pregnancy tests always work?

1 doctor answer1 doctor weighed in
Dr. Paula Hillard
Obstetrics and Gynecology 44 years experience
No: Not quite as sensitive as blood pregnancy tests. If you've had unprotected sex and a missed period, see your dr. Also other causes of missed periods like hormone imbalance.

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A 48-year-old member asked:

What is the mechanism by which home pregnancy tests work?

1 doctor answer4 doctors weighed in
Dr. Christopher Dowd
Internal Medicine 20 years experience
Urinary hcg: They test for urinary levels of HCG which become elevated in pregnancy. It can take as much as 2 wks to turn positive and over-the-counter tests aren't always as sensitive as tests at your doctor's office. Recheck a week or two later if you're late for your period & suspect you might be pregnant.
A 43-year-old member asked:

After delivery, how soon will the home pregnancy tests work?

1 doctor answer2 doctors weighed in
Dr. Susan Dantoni
Obstetrics and Gynecology 26 years experience
Pregnancy test: After you deliver, your pregnancy test can remain positive for up to a month or so afterwards. It is sometimes hard to tell if positive pregancy test is just leftover from the delivered pregnancy or a new pregnancy. The best way to tell is to do serial a beta HCG levels(a blood test) and see if the numbers are going up or down.
A 39-year-old member asked:

How do pregnancy tests work?

2 doctor answers7 doctors weighed in
Dr. Carolyn Thompson
Obstetrics and Gynecology 28 years experience
Measure hormones: Pregnancy tests measure the level of a hormone called human Chorionic Gonadotropin (hcg), which begins to be produced when the fertilized egg implants into the uterine wall. This hormone can be measured in urine or in the blood. The blood test is the more accurate of the two methods.
A 17-year-old female asked:

Do homemade pregnancy tests work?

2 doctor answers3 doctors weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
No: One can buy a urine pregnancy test at the store. It will give a reliable result, if the test is done correctly, 1 week after missing a period, or 3 weeks after sex (when conception might have occurred). If a woman's normal regular period happens, then she is not pregnant at that time, and doesn't need to do a pregnancy test at that time.
Saint Paul, MN
A 17-year-old female asked:

Can home pregnancy tests have glitches ?

3 doctor answers6 doctors weighed in
Dr. Elise Sadoun
Family Medicine 14 years experience
Usually accurate: Home pregnancy tests are pretty accurate. If positive, almost 100% correct. They are less accurate when taken very early in the pregnancy or very late when you can get a false negative. Also, make sure the control line appears. See your doctor if you have doubts or if the pregnancy test is positive. Good luck.

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Last updated Apr 6, 2013

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