One of the most frequent questions asked about home pregnancy tests is probably the most important:

is it positive?

Pregnancy tests are developed to detect the Human Chorionic Gonadotropin hormone, also known as HCG.

Regardless of how faint a line may be when it appears on your pregnancy test, if it’s there, you’re pregnant.

When a faint line appears, it generally means that there is only a small amount of HCG detected in the urine. When the line displays quickly and clearly, it is because there is a larger amount of HCG in the test sample.

Some tests differ in the amount of HCG they detect, with the average pregnancy test testing for 20 mIU/mg of HCG in a given urine sample. If your levels are above this, then you will test positive with a bright, clear line; if your body has any less than 20mIU/mg (but more than zero), the test may show a faint line instead.

There are ultra sensitive tests on the market which will test for levels as low as 10 mIU/mg, with any reading above this amount producing a clear result, and anything lower producing a faint line.

The other explanation for a faint line on your pregnancy test could be explained as simply as there just isn’t enough dye in the test to stick to the HCG.

So, to sum it up: if there are two lines, the test is positive and you’re pregnant.


We offer pregnancy tests and ultra sensitive tests in both midstream and strip formats. Feel free to explore our Pregnancy test section on our website to see all the tests we offer and to learn more about how each test works.

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