taylorxx
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It isn't true that they measure LH. That might be true of some sorts of digital tests. But the different lines on the CB digi measure different sensitivites of hcg. One turns darker with a low amount of hcg - that's the one that tells you if you are pregnant or not. One turns darker with a higher amount of hcg, that's the one that makes it register 3+. It's like when you buy internet cheapies, you can get 10miu and 25miu. This test basically has a sensitive and a non sensitive strip inside it.
The digital mechanism analyses the colour of the strip. It reads the first line to decide pregnant or not pregnant. Then it looks at how dark the two lines are to decide how many weeks. It's nothing to do with LH. The third line is just the control that indicates that the test got wet enough.
Okay thanks for clearing that up! I had read that before but I didn't really understand why it would measure LH in the first place since it has nothing to do with pregnancy. That makes sense, but what about the ones that do not have the conception indicator (we don't have those in the US)? I wonder if they work the same? xx