Blood test question?

How accurate are the results when testing blood for pregnancyBlood test question?
Very accurate. It counts the number of molecules of HCG.
100%
Very accurate. They are better then urine but just to be sure i would get both a urine and blood test to be sure.
The results are very highly accurate in what they are testing for, which is the pregnancy hormone.
The only other thing I know of that can produce that hormone is an ovarian cyst.
False negatives are more common than false positives, but if you have a positive result odds are high you are pregnant.