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How to Read an Ovulation Test

Dec 23, 19 2 min
How to Read an Ovulation Test - Natalist

If you’re wondering “when should I start testing for ovulation?”and want to know how to interpret the results when you take it, read this quick guide. 

By women's health expert Halle Tecco, MPH, MBA

What is an ovulation test?

Ovulation tests (aka ovulation predictor kits) are clinically proven to identify your fertile window. While different from an advanced digital ovulation test, our midstream ovulation tests can help you identify your most fertile day. Through the use of a midstream ovulation test stick, the tests can help you get to know your body and its variations, and identify the time when you're most likely to conceive.

After you follow the midstream ovulation test stick instructions, pee on the test or dip the strip in urine, and wait for the test result, take a close look at the two lines. One is the control line (C), which is there to make sure the test worked. The other is the test line (T) that shows the ovulation result. 

Unlike a pregnancy test, two lines alone is not a positive result since your body makes LH at low levels throughout your cycle. A result is only positive if the test line (T) is as dark or darker than the control line (C) line. 

Unlike a pregnancy test, two lines alone [on an ovulation test] is not a positive result since your body makes LH at low levels throughout your cycle.

How To Properly Read an Ovulation Test

Positive: In short, if the test line (T) on the ovulation test stick is as dark or darker than the control line (C), the test is positive. This means you are in your fertile window, and you'll likely ovulate within 36 hours. If you want to get pregnant this month, now is the time as you are in your peak fertility window—aka the time when you're most likely to conceive.

An example of a positive ovulation test

Negative: If only the control line (C) on the test shows up, or if the control line (C) is darker than the test line (T), the test is negative (you are not having an LH surge). In this case, try testing again tomorrow. 

An example of a negative ovulation test

Invalid: If only the test line (T) shows up, or neither lines show up, the test didn’t work. This could mean the absorbent tip wasn’t saturated with enough urine, or the test is damaged or expired (check the wrapper). Grab another test and try again. If you still get an invalid result, contact us.

An example of an invalid ovulation test

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