Natural Contraception with Persona Fertility Monitor

You name it…condoms, patches, pills, and apps to control our fertility? The list just keeps getting better. If you prefer a natural contraceptive method, it’s no coincidence that you’re on this page. The Persona Fertility Monitor might be just what you need. But, read on to find out whether this contraception method is right for you.

What is The Persona Fertility Monitor and How Does it Work?

Persona Contraception Monitor

Persona Test Sticks

This fertility monitor by Clearblue is a natural family planning device that permits you to take charge of your fertility without using hormones or barrier methods.

Think of Persona as a high-tech calendar method that goes beyond conventional sympto-thermal methods of family planning by aligning measurements of bodily signals with a computer algorithm. 

Persona consists of a touch screen monitor that should be used with test sticks, which are sold separately. For your first cycle, you will need 16 test sticks; you will need fewer test sticks (eight sticks) from your second cycle onward. 

The manufacturer claims that the device is 94% reliable, i.e., if 100 women use the monitor for one year, six would likely conceive.

The device was designed to track changes in the levels of estrogen and luteinizing hormone in your urine to identify your most fertile days. It uses a color code to help you know when you’re safe or unsafe. 

Green days indicate that it is safe for you to have intercourse, whereas red days indicate that you’re fertile and you risk getting pregnant if you have intercourse.


  • No adverse effects associated with its use
  • Very reliable (94%); however, this requires that you use the monitor is directed so that you do not miss test days.


  • The monitor works only with the test sticks, which, unfortunately, have to be bought separately.
  • You cannot mix test sticks from a different batch during a cycle. If you have any remaining sticks during a cycle, you have to discard them.

How to Use the Monitor

It is advisable to read the package insert that comes with the device before using it to obtain the best results. However, you should note that this method of contraception is not for everyone.

According to the manufacturer, this monitor is not for use in the following subgroups of women:

  • Women with cycles < 23 days or > 35 days.
  • Women with menopausal symptoms.
  • Breastfeeding moms.
  • Women who cannot or who absolutely do not wish to conceive.
  • Women who are using hormonal treatments, including contraceptive pills, fertility treatments or hormone replacement therapy.
  • Women who are using any treatment that can alter their cycles.
  • Women with polycystic ovarian syndrome.
  • Women who have liver or kidney problems (you can check with your health care provider for assessment).
  • Women taking tetracycline-containing antibiotics.

In some cases, you might have to wait for a few weeks to months before using the Persona Contraception Monitor.

This is the case if you have recently been breastfeeding, using a hormonal contraceptive method, using any treatment that can cause menstrual cycle changes, or pregnant (even if you had a miscarriage).

If you were pregnant or you’ve stopped breastfeeding your baby or taking hormonal treatment or other treatments, you’ll have to wait to have two consecutive natural menstrual cycles before using the device on your third menstrual cycle.

If you were taking a tetracycline-containing regimen, you’ll have to wait until your next cycle after stopping the treatment.

For detailed instructions on how to use the Persona Fertility Monitor, download the guide on the manufacturer’s website.

Here are a few things that you must consider before using this monitor.

1. Set the monitor on day 1 of your menstrual cycle, which is the day you get your period.

– This should be done during each cycle.

– You have until day 4 to set the monitor in the event that you forget to do so on day 1.

– You can set the monitor by entering the day and time when your period starts.

2. Choose a convenient time during which you can perform the test using your first urine of the day.

– It is preferable to choose a six-hour testing window in which you’ll test on weekdays and weekends.

– If you’re working, for example, and you wake up early in the morning to prepare for work, you can perform the test at 6 a.m.

– If you wake up later on weekends, say between 8 and 10 a.m., you can test at 9 a.m. Therefore, you can make your testing window 5 to 11 a.m.

– You must not necessarily use the same testing window during each cycle and can change this at the beginning of each cycle. The device will only require you to test during the testing window.

When Should You Perform the Test?

The device will indicate your test day. During your cycle, you will be asked to perform the first test on day 6 and cycle days 9 to 23.

After your first menstrual cycle, you will be required to perform the test on eight days of each menstrual cycle as follows: on day 6 and any seven consecutive days of your cycle. Test days may differ from one cycle to the other.

Other High-Tech Fertility Monitors


This monitor uses both the temperature and calendar method to help you plan and prevent pregnancy. This device uses your data to predict when you’re fertile or infertile during your menstrual cycles.

A clinical trial demonstrated that a woman’s probability of having an unintended pregnancy was 5.3% after one year of use, 6.8% after two years of use, and 8.2% after three years of use.

Clearblue Fertility Monitor

This fertility monitor was designed for couples looking to become pregnant and is not actually a natural family planning method.

n fact, researchers have shown that, when used for the purpose of contraception, it was less effective when used without any other method of contraception.

Final Words

Overall, the Persona Fertility Monitor is a good choice for women who wish to avoid hormonal contraceptive methods. When using this device, remember that technology has its limitations and devices like Persona will only work well when you use them as recommended.

It is advisable that you use another birth control method (e.g., condoms) if you’re not sure whether you and your partner can abstain from sex or have protected sex when the device shows a red light.


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