Miscarriage/Pregnancy Loss

Sensitivity of First Response

Hello everyone,

I was wondering if anybody knows what levels of HCG First Response tests actually pick up? I've seen studies that say 6.5, and I know for a fact that they detect at least 8 as I've had faint positives on the same day as having blood HCG of 8. I even read a post from one woman saying that she got a positive First Response when her blood HCG was 2!! That seems somewhat unlikely, though.

The reason I ask is that I am going through a miscarriage and my HCG is dropping pretty slowly. I'm taking a First Response test every day and still getting faint positives. My blood HCG on Monday was 8, and it's being tested again this coming Monday. I'm very scared that my HCG might have plateaued or gone up :(

So far:
13 Sept - MVA - scan confirmed womb clear
17 Sept - 3cm chunk of tissue comes out which MVA and scan somehow missed!
18 Sept - HCG 19
21 Sept - HCG 19
27 Sept - HCG 11
2 Oct - HCG 8

I just want this over. Thank you everyone.


Re: Sensitivity of First Response

  • Options
    you can't compare blood and urine levels like that. And urine pregnancy tests are qualitative, not quantitative, so you can't determine the amount of HCG from them. They also aren't standardised for this purpose. 
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    the_berry I know someone who took months for her HCG level to drop to 0. I know you just want it to be over, but you're very close. Patience!

    MC #1: D&C Oct 23, 2015 (7.5 weeks)
    MC #2: July 1, 2016 (5.5 weeks)
    MC #3: October 17, 2016 (CP)
    RE #1: RPL testing November 2016-January 2017
    MC #4: Feb. 28, 2017 (CP)
    RE #2: Additional RPL testing March-November 2017
    MC #5: January 2019 (6.5 weeks)

    RE #3: More testing 2023. 
    Egg Retrieval Sept/Oct 2023, 2 good embryos after PGT-A testing.
    Surgery for endometriosis January 2024
    Lupron Depo March 2024.  Benched 3 months.  Hopefully FET after that.


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