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blood test for pregnancy

How many days late do you have to be for a positive blood test result (assuming you are pregnant!)

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Asked by summerbudbud at 9:26 PM on Aug. 12, 2010 in Trying to Conceive

Level 10 (458 Credits)
Answers (6)
  • usually something like two days pregnant, but it also depends on what kind of test you do. anything over 4 is considered pos in some and in others it's anything over 25

    Answer by angevil53 at 9:28 PM on Aug. 12, 2010

  • A blood test will pick up HcG before a HPT will. I'd wait until at least 14 days DPO.

    Answer by LorisBaby at 9:28 PM on Aug. 12, 2010

  • Should be pretty immediate after conception....maybe a matter of 24 to 48 hours later.

    Answer by Finkette at 9:29 PM on Aug. 12, 2010

  • Our HPT came up positive on 8DPO but I went to the Health Dept at 10DPO and their test did not show up positive, however it was not a blood test. A blood test at the Dr. showed up positive on 10DPO. I think it is different for everyone depending on their hormone levels. I would wait until about 14DPO or the day of your missed period.

    Answer by hsmominky at 9:36 PM on Aug. 12, 2010

  • HCG actually has to be at 5 mIU(most urine tests do not register until around 25) Blood screenings can detect a pregnancy earlier than a urine test at about 7-12 days from possible conception whereas a urine test then the earliest you can take a test would be 14 days from possible conception.

    For those saying 48 hours after sex for a HCG not possible.

    The test may fail to detect hCG even when a woman is pregnant if the test is done too early. It takes at least 7 days after fertilization for the test to become positive.

    Human chorionic gonadotropin (hCG) is a hormone that is produced by the placenta. It is detectable in the blood and urine within 10 days of fertilization (1 to 2 days after implantation).  As said above, 7-12 days at the earliest for a blood screening.


    Answer by SmileyMoo at 9:38 PM on Aug. 12, 2010

  • im honestly not sure i had a blood test for dd 2 but i was about a month late then too

    Answer by mommam58122 at 9:41 PM on Aug. 12, 2010

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