Ovulation Tests Explained: What a Positive LH Test Actually Means

The first few times I used ovulation tests, I had absolutely no idea what I was doing.

Mine came with the tiny strips and a little cup, so I had to pee into the cup and dip the test in.

I remember missing the cup, spilling it another time, and thinking, Why is this so much harder than it looks?

Then came the even more confusing part.

I would stare at the lines thinking:

Is that positive?

Is it dark enough?

Does this mean I am ovulating right now?

It definitely took a little practice.

The most important thing I eventually learned was this:

A positive ovulation test does not mean you are ovulating at that exact moment.

It means your body has detected a rise in LH, luteinising hormone, and ovulation is likely getting close.

What does an ovulation test measure?

An OPK, or ovulation predictor kit, looks for a rise in LH.

LH usually rises before ovulation and helps trigger the release of the egg.

Ovulation often happens around 24 to 36 hours after the LH surge is detected, although timing varies.

What does a positive test look like?

With many strip tests, the test line needs to be as dark as or darker than the control line to count as positive.

A faint second line is usually not considered positive because small amounts of LH can be present throughout the cycle.

Digital tests work differently, so always follow the instructions for the brand you are using.

When should we have sex after a positive test?

The day you get a positive result and the following day can both be useful days to try.

But do not feel like you have to wait for a positive OPK before having sex.

If you already have fertile cervical mucus, your fertile window may already be open.

Does a positive OPK prove I ovulated?

No.

An OPK tells you an LH surge happened.

It does not confirm that an egg was released.

A sustained BBT rise afterwards can help support that ovulation likely occurred.

OPK predicts. BBT helps confirm.

What if my test is positive for more than one day?

That can happen.

Some LH surges are short and others last longer.

You may see positive tests across more than one day.

What if I get more than one LH surge?

Sometimes the body can begin preparing to ovulate, LH rises, but ovulation does not happen straight away.

The body may try again later in the cycle.

This may be more common with irregular cycles or PMOS.

What if my OPK does not match my predicted fertile days?

Your predicted days are an estimate based on your cycle history.

A positive OPK gives you information about what your body is doing right now.

That is why logging the result can be helpful.

Try this in The Mama Years

Log your OPK result when you test.

Then you can see it alongside your cervical mucus, cycle dates and BBT rather than trying to remember everything separately.

And if your first few tests involve a little confusion, or even a little wee everywhere, you are definitely not the only one.

Read next

• LH Surge vs LH Peak: What Is the Difference?

• When Do You Ovulate After a Positive Ovulation Test?

• How Do I Actually Know When I Ovulate?

• Your Fertile Window: The Days You Can Actually Get Pregnant