Saliva Ovulation Test with Automated Pattern Recognition

How to use Babyndex for Ovulation Prediction

Baba - Mama

Babyndex makes Saliva Ovulation Test easy to use and increases its accuracy

You need an ovulation microscope 

Babyndex is the first digital saliva test. The mobile application can automatically interpret the saliva test, for which we supply an ovulation microscope

Take off the removable lens, add a drop of saliva to the glass and allow the saliva to dry. In about 10 minutes, put the lens back, press the built-in LED light button. You can read your body’s signals just by viewing the sample through the microscope.

full ferning
Saliva crystals - full ferning
Saliva crystals - full ferning sharp

Depending on where you are in your monthly cycle, you can see dots and circles, fern-shaped crystals (full or partial) or a combination of these. These patterns get denser and sharper towards ovulation; in other words the probability of crystals increases.

Babyndex can automatically detect saliva patterns

Instead of viewing the patterns yourself, use the Babyndex app to detect the fern-shaped crystals in your dried sample.

Just take a photo with the app and it calculates the probability of the fern-shaped crystals. It also stores your photos and shows the results for each day when you took the test. The app can help you find out whether or not you may be near your actual ovulation.  

The saliva test shows the fertile window

The increasing probability of fern-shaped patterns in your dried sample predicts ovulation. 

The fertile window is the day of ovulation and the five days beforehand. These are your most fertile days of your menstrual cycle. Having intercourse during this time gives you the best chance of getting pregnant.

The saliva test is not perfect, though, and you might fern outside of this time period or when you are pregnant. However, if you are ovulating or about to ovulate, the crystal-like patterns appear on consecutive days. Seeing day-after-day high crystal probability helps you identify the fertile window in your cycle.

Use Babyndex every day for a full cycle 

At the beginning, you need to do the saliva test every day for a full cycle. This is the only way to find out if the test works well for you. 

Later, start doing the test daily before you expect to be in the most fertile days of your menstrual cycle. You will get your best results when you use the test within the five-day period around your expected ovulation.


  1. Test in the morning when your hormone levels are high and never test after eating, drinking, smoking, or brushing teeth.
  2. Clean the lens before using the test and carefully remove it by pulling it out of the casing.
  3. Place a drop of saliva on the surface of the lens.
  4. Allow the saliva sample to dry for about 10 minutes and then replace the lens into the housing. 
  5. Hold to the lens against the camera of your mobile and push the light button to take a picture with the Babyndex app to see the results.
  6. Clean the lens after every use (with a clean soft cloth or lens cleaner).

Common mistakes 

Babyndex will soon detect bad samples and help you adjust the amount of saliva that you need to add to the glass of the lens and the time to wait for the sample to dry. Until then please refer to the following common mistakes and try to avoid them.

Too little sample

When you collect too little saliva, there are some visible sharp details. But the amount of saliva is not enough for crystals and other artifacts to be seen.

Too little sample
Too little sample
Too little sample

Too much sample

When you collect too much saliva sample, there are many visible sharp details. But the amount of saliva makes it impossible to distinguish structural patterns, crystals and other artifact from each other. Avoid creating air bubbles.

Too much sample
Too much sample
Too much sample

Too wet sample

When you collect the right amount of saliva sample but you do not wait for it to dry, there are visible details but they are blurred and not sharp. This mistake is quite common; please remember that the saliva sample has to be dry for structural patterns to develop and to be seen. Allow the saliva sample to dry for about 10 minutes after that you can replace the lens into the housing. 


Too wet sample
Too wet sample
Too wet sample

Advantages of Babyndex 

The analogue saliva ovulation predictor tests are hard to interpret and cannot reach their real potential in real use. 

Babyndex is the first digital saliva test that can detect changes of patterns in dried saliva samples. It can automatically interpret the saliva test results and can help you plan to become pregnant

Harvard researchers concluded in a 2018 study that the accuracy of the same solution as Babyndex is higher than 99 %. Using our method, we detect estrogen hormone increases in a much less intrusive and more affordable way than comparable urine or electrolyte tests. 

Babyndex should not be used as a contraceptive device

Near your time of ovulation, your dried saliva may form a fern-shaped pattern due to the increase of your estrogen and salt levels. The visible fern-like crystals begin to appear around 3 to 4 days prior to ovulation and you need a small microscope to see them. The saliva test allows you to predict ovulation by viewing these structural changes in your dried saliva. 

In 2012, the FDA approved the saliva test for ovulation prediction.

While other sites advertise saliva tests as a means of contraception, we do not advise you to use the saliva test to help prevent pregnancy, because it is not reliable for that purpose. 

In addition, if your test is positive and you know your most fertile days, it does not mean you will definitely become pregnant.


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