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Positive Hcg urine test/Negative Blood Serum Test

What would make a positive urine test and then a negative blood serum test?
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178698 tn?1228774338
One possibility is a chemical pregnancy.  I took a home pregnancy test and even the digital one which said "Pregnant".  By the time I got in to see the OB - about 6 days later, I got a negative blood serum test.  In a chemical pregnancy you are actually pregnant, but it fizzles out for lack of a better word.

Or

Maybe you got an evap line or read the test beyond the time specifications listed in the instructions.
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Avatar universal
i don't know, but it has happened to me before! was it a blue dye test, they are notorious for false positives.
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