3 doctors weighed in:
What is the mechanism by which home pregnancy tests work?
3 doctors weighed in

Dr. Christopher Dowd
Internal Medicine
2 doctors agree
In brief: 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.

In brief: 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.
Dr. Christopher Dowd
Dr. Christopher Dowd
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