Top Ranked Reusable Ovulation Tests

Looking for a reusable ovulation test? Like many women, you might be worried about running out of test sticks when using traditional urine-based ovulation predictor kits.

Besides, it can get really expensive to buy ovulation test sticks considering that you would need to use at least four to ten test sticks per cycle (or more if you have very long cycles). For some brands, that’s about $2.99 per stick for a kit that contains 10 test sticks.

Is a Reusable Ovulation Test As Effective As a Non-Reusable One?

Reusable ovulation tests that are currently on the market are saliva-based. Preliminary data show that these tests are as effective as conventional urine tests in detecting ovulation.

In a study published in a reputable European obstetric and gynecology journal, some investigators found that both the saliva test, Geratherm ovu control, and the urine luteinizing hormone test detected the fertile window.

The investigators found a high level of conformity for the same test results from cycle day 5 (100%) to cycle day 14 (84%) and from cycle day 18 (80%) to cycle day 22 (96%).

Top-Ranked Reusable Ovulation Tests

The tests listed here are all saliva-based ovulation tests. These tests detect slight changes that occur in a woman’s saliva as she approaches ovulation.

The changes in saliva can be observed under a microscope and have a characteristic ‘fern like’ pattern.



Identifiable Fertile Days


Maybe Baby Saliva Ovulation Tester

2–3 days


Fertile Focus Ovulation Microscope

3–5 days


KNOWHEN Saliva Ovulation Test with a Fertility Monitor App

5 days


Geratherm OVU Control Fertility Test

6 days


Maybe Baby Saliva Ovulation Tester

This reusable ovulation test is a mini-microscope that works by measuring the levels of estrogen and salt in your saliva to help you predict your most fertile period.

It is a non-invasive test that can predict ovulation two to three days in advance.

The results are easy to interpret and can be read within 10 to 15 minutes.

Read the full review, including the pros and cons of Maybe Baby Saliva Ovulation Tester.

The tutorial below shows you how to use the Maybe Baby Saliva Ovulation Tester.

Fertile Focus Ovulation Microscope

Like the Maybe Baby test, this reusable ovulation test consists of a lipstick size microscope.

It detects changes in your saliva that are brought about by alterations in the levels of estrogen.

It can accurately predict ovulation 72 hours before it occurs.

Read the full review here to learn more about Fertile Focus Ovulation Microscope, including its pros and cons.

Here's a video that shows you how to use Fertile Focus.

KNOWHEN Saliva Ovulation Test with a Fertility Monitor App

This affordable and highly accurate ovulation test comes with a mini-microscope that can be conveniently carried around.

With an accuracy rate of 98.9%, this reusable ovulation test can help you detect your five most fertile days.

This Food and Drug Administration-approved ovulation test also works by detecting estrogen levels in your saliva.

At around ovulation, when your estrogen levels increase, your saliva becomes highly saline.

To perform the test, place a drop of saliva on the test slide and let it dry. Then examine the slide under the mini-microscope that comes in the kit. You should see a typical fernlike pattern.

The video below walks you through the process of using the KNOWHEN ovulation test.

The KNOWHEN Fertility Monitor app can be downloaded for free.

It helps you to track and monitor your ovulation and sexual activity so that you can have intercourse during your fertile days and maximize your chances of conceiving.

The app keeps tract of your data on a secure server, and you can view them at any time.


  • It is a natural and safe method of tracking ovulation.
  • It is highly accurate.
  • The app also provides helpful educational information regarding fertility and women’s reproductive health.
  • The data collected by the app are stored on a secure server.


  • Some women find it challenging to read the results, especially those who are new users.

Geratherm OVU Control Fertility Test

This saliva-based ovulation test also has a lipstick design and comes with a mini-microscope that has a magnification of 50x.

Also included in the test kit is a cleaning cloth for the lens of the microscope.

Geratherm OVU Control Fertility Test is very reliable and easy to use.

How to Perform the Test and Interpret the Results

For best results, it is recommended that you follow the instructions of the manufacturer as explained in the video below. You can also read about what to expect when you view your results here.


  • It is easy to use.
  • The results are accurate (98%) and can be read within 10 to 15 minutes.
  • Quick turnaround time.


  • It is not available in some countries.
  • New users might find difficulties interpreting the results and they need to use it daily and compare patterns to familiarize themselves with the test.


A reusable ovulation test is economical and can help you save you the equivalent cost of two months of a traditional urine test.

Besides, these tests are as accurate as traditional urine-based ovulation test when used as instructed by the manufacturer.

However, they also have their downside, including the fact that some women might require a bit of practice to interpret the results properly.

Further Reading

Günther V, Bauer I, Hedderich J, Mettler L, Schubert M, Mackelenbergh MT, Maass N, Alkatout I. Changes of salivary estrogen levels for detecting the fertile period. Eur J Obstet Gynecol Reprod Biol. 2015 Nov;194:38-42. doi: 10.1016/j.ejogrb.2015.08.007. Read the article.


I’m Princila, founder of Check Ovulation and a proud mom of two. I’m an alumna of James Lind Institute. After working in clinical jobs, my passion for writing took its toll, and I ended up switching careers to work in the medical publishing industry. I also have a passion for healthy food, which prompted me to take several online courses in nutrition and health offered by Wageningen University. (I still haven’t completed the courses thanks to my busy mommy schedule!). When I’m not writing/editing scientific and medical manuscripts or taking care of my family, I use my free time to research, learn, and write about healthy living. I have also authored a few books in the self-help niche using the pen names Princila Murrell or PN Murray. Protection Status