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Why is it that some women can take a hpt a day after they missed their period and get a +, yet other women don't get a + until they are a few weeks late?

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Asked by S.D.A at 9:39 PM on Sep. 13, 2010 in Trying to Conceive

Level 5 (71 Credits)
Answers (6)
  • Different tests have different sensitivity. And HPT trusts for hormones in the urine. Some women produce more of the hormone faster. It's called hCG. Also, t takes about 11-17 days for detectable amounts. So a woman who got pregnant on her ovulation day will have a higher amount than a woman who got pregnant 3 days before her period was due. They both missed a period, but one will have to wait longer to test positive.

    Answer by ecodani at 9:46 PM on Sep. 13, 2010

  • ? probally miscalculations on when they should be having a period....what i did was keep up with my period and an average # of days when i'd start and took a test when i was about 3 days late or so

    Answer by josiesmommy00 at 9:47 PM on Sep. 13, 2010

  • You have to have a measurable amount of hCG in your urine to test positive. Some women produce more right away, others don't. There's also the matter of test sensitivity, like a PP said; a test that detects a lower concentration (must say it gives accurate results up to 5 days before a missed period) will give you a positive sooner than one that detects a higher concentration. The actual amount of hCG produced varies from woman to woman and pregnancy to pregnancy; it's just one of those things, kind-of like how some women get morning sickness at 6 weeks and others don't at all.

    Answer by DragonRiderMD at 9:57 PM on Sep. 13, 2010

  • Thank you so much!

    Comment by S.D.A (original poster) at 10:06 PM on Sep. 13, 2010

  • different tests have different sensitivities... and all women produce hormones differently

    Answer by elizabiza at 2:25 PM on Sep. 14, 2010

  • it really just depends on the test!

    Answer by Mrs.Josiewood at 2:51 PM on Sep. 14, 2010

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