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HPT accuracies and LPs

gymnst1013gymnst1013 member
in Trying to Get Pregnant

I remember this being asked a couple of months ago but I don't remember what everyone had to say.

For those of us with short LPs, it seems that even if AF is late, we would not get +HPTs right away.  No matter the length of your LP, it takes the same amount of time after implantation to build up enough HCG to turn a HPT positive, right?  So it seems like the HPTs are somewhat misleading by saying that they are x% accurate x number of days before AF is due.

Example:
11 day LP - AF would be late at 12dpo with HPT accuracy of 62%
14 day LP - AF would be late at 15dpo with HPT accuracy of 80%.

Am I overthinking this?

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Re: HPT accuracies and LPs

  • ashleyann82ashleyann82
    Nope, I'm agreeing with you on this.  I was thinking the same thing!
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  • elizjane26elizjane26
    Ive been wondering the same thing. I have a 12 day LP (usually) and I took a test today and it was BFN. Hmmmmmm....
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  • heathercaraheathercara
    See, now I figured the opposite.  I have LPs as short as 6 DPO, so I figured I could test earlier as implantation would occur earlier :)  Hmm.  Experts?
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  • LnR70707LnR70707 member

    I second guess myself on this too, look like I'll always be testing early with my 11 day LP.

    But if there is enough HCG to stop AF from arriving, wouldn't there be enough to show up on a test?


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  • craftlady07craftlady07

    you're not overthinking - that's correct.

    here's the chart. (not dependant on LP)

    HPT Accuracy Results Percentages: (Based on a 25mIU sensitive test)
    10 dpo : 35%
    11 dpo : 51%
    12 dpo : 62%
    13 dpo : 68%
    14 dpo : 74%
    15 dpo : 80%
    16 dpo : 88%
    17 dpo : 92%
    **Don't Test Early!!**
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  • Mrs.JohnsMrs.Johns member
    I was thinking the same thing Smile
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  • gymnst1013gymnst1013 member

    imageheathercara:
    See, now I figured the opposite.  I have LPs as short as 6 DPO, so I figured I could test earlier as implantation would occur earlier :)  Hmm.  Experts?

    I definitely could be wrong but it seems like the time for implantation doesn't have to do with LP - it is just the amount of time it takes for the embryo to travel down the tubes and reach the ute which is why a short LP is bad - not enough time to implant.

    :::runs off to research:::

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  • Hibiscus2007Hibiscus2007
    I think the same thing.  I posted this in a reply yesterday.  With my first pregnancy I didn't get +HPT until 13dpo even though I have 10-11 day LP, it was negative until then, but I was charting so I had an idea it was going to be +.
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  • kimsandekimsande
    imageL&R70707:

    I second guess myself on this too, look like I'll always be testing early with my 11 day LP.

    But if there is enough HCG to stop AF from arriving, wouldn't there be enough to show up on a test?

     you would think! 

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  • gymnst1013gymnst1013 member
    imagecraftlady07:

    you're not overthinking - that's correct.

    here's the chart. (not dependant on LP)

    HPT Accuracy Results Percentages: (Based on a 25mIU sensitive test)
    10 dpo : 35%
    11 dpo : 51%
    12 dpo : 62%
    13 dpo : 68%
    14 dpo : 74%
    15 dpo : 80%
    16 dpo : 88%
    17 dpo : 92%
    **Don't Test Early!!**

    And this is why I think HPT instructions are misleading - Because the are based on when AF is late, not how many dpo you are.  Bastards!!

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  • kimsandekimsande

    imageelizjane26:
    Ive been wondering the same thing. I have a 12 day LP (usually) and I took a test today and it was BFN. Hmmmmmm....

    I'm right there with ya!  Does this mean there is a possiblity it could still be a BFP in a few days?  Maybe we just test too early?

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  • heathercaraheathercara
    imagecraftlady07:

    you're not overthinking - that's correct.

    here's the chart. (not dependant on LP)

    HPT Accuracy Results Percentages: (Based on a 25mIU sensitive test)
    10 dpo : 35%
    11 dpo : 51%
    12 dpo : 62%
    13 dpo : 68%
    14 dpo : 74%
    15 dpo : 80%
    16 dpo : 88%
    17 dpo : 92%
    **Don't Test Early!!**

    well that is a major HPT buzz kill...

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  • gymnst1013gymnst1013 member
    More info FWIW - this is not from a scientific study or anything, but from what I've read, a fertilized egg (not yet implanted) releases a hormone (I know I've read about it but for the life of me can't find the name) that signals the corpus luteum to continue producing progesterone until the egg implants.  So even before implantation, there are hormones floating around signaling AF not to show.
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  • craftlady07craftlady07
    imagegymnst1013:
    imagecraftlady07:

    you're not overthinking - that's correct.

    here's the chart. (not dependant on LP)

    HPT Accuracy Results Percentages: (Based on a 25mIU sensitive test)
    10 dpo : 35%
    11 dpo : 51%
    12 dpo : 62%
    13 dpo : 68%
    14 dpo : 74%
    15 dpo : 80%
    16 dpo : 88%
    17 dpo : 92%
    **Don't Test Early!!**

    And this is why I think HPT instructions are misleading - Because the are based on when AF is late, not how many dpo you are.  Bastards!!

     

    that's exactly why they are misleading - the instructions are written based on the general notion that the LP is 14 days long.

    Always test based on your DPO not when you "expect" your period to show up.

    ETA: If you have a short LP, save your money and don't test until AF is late.

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  • williawwilliaw member
    Hmm...maybe I'll wait til Sunday to test...

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