HCG Testing
Some quotes for my own use:
HCG is detectable in the blood or urine 1 to 2 days after implantation of the fertilized egg [link]
Quantitative blood tests and the most sensitive urine tests usually detect hCG shortly after implantation, which can occur anywhere from 6 to 12 days after ovulation. … Less sensitive urine tests and qualitative blood tests may not detect pregnancy until three or four days after implantation. [link]
… with regular laboratory hCG tests, hCG is usually found in sufficient levels as early as 2-3 days after implantation. [link]
I hate it when sources disagree. *rolls eyes* Hasn’t anyone done a study on this yet?
This is a really good page of info on hCG levels – especially interesting is the table showing the different levels in singleton and twin pregnancy hCG levels. Will need this later!
And this is interesting:
In a recent study, reported in the Journal of American Medical Association, 10% of 250 women tested had not even implanted by the first missed period. Therefore, their hCG was so low that no urine test could detect it. [link]
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