MadSci Network: Medicine

Re: how many days after, do u find out?

Date: Tue Nov 13 19:22:01 2001
Posted By: Stephen A. Butler, Post-doc/Fellow, Obstetrics and Gynaecology, University of New Mexico
Area of science: Medicine
ID: 1005091894.Me

Hi Kelly, this is very good question and we are trying to answer it in our 
research at the moment. 

When you have sex you donít always get pregnant, if you do get pregnant 
then the new tiny baby will start to make a chemical (hormone) that keeps 
the baby alive. This hormone flows in the motherís body and when there is 
enough hormone we can see it in a special test. The test is performed on 
the womanís serum (from her blood) or on her urine if the test is positive 
we then know that the mother is pregnant. 

The problem is that each baby produces different amounts of the hormone so 
in some women we can see a positive test in less time that in others. To 
give you an answer, you can test positive for pregnancy in blood as early 
as 2 weeks after having sex (in some women). The hormone is made after 
about 5 days. Generally if you are pregnant most women will give a 
positive test after four weeks. The test is better in blood because there 
is more hormone at an earlier day, but after 5 weeks both blood and urine 
tests are good.


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