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How do pregnancy
tests work?
continued...

There is no agreement on a particular
level of ßHCG representing pregnancy, as there is variation
between women and foetuses, and even differences between pregnancies
of single and multiple foetuses. Effectively, though, if a premenopausal
woman tests for more than 5 it can be assumed that implantation
has occurred.
Pregnancy tests that use a urine
sample are all based on detecting higher levels of ßHCG. Different
tests have different sensitivities, often varying between 15 and
25 mUI/mL, and thus can be more or less effective very early in
the pregnancy. Most tests in Australia have sensitivity greater
than 20mIU/mL.
Tests available from www.downunderptopk.biz
test for 20mIU/mL of ßHCG and thus can be used as early as
6 days after ovulation, which is before the woman even expects to
have a period. A result can be seen as soon as 40 seconds later,
but clearer results require 5 minutes. This Australian site sells
the tests for only $2 each, compared to $10.39 for 2 tests at Coles
and $6.28 for one test at Safeway.
by Tash Hughes of Word Constructions
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Early Pregnancy Symptoms
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But you aren't sure what the signs are we have a list of early pregnancy
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