How YO Works

Simple Steps to Fertility Insights

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Connect YO Block

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Mix Powder

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Collect Sample into Pipette

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Insert Sample into Slide

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Insert Slide into Device

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View Results on App

Monitoring Reproductive Health in Private

As part of Medical Electronic Systems family of products, we have achieved:

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Clinics Worldwide | Our technology powers fertility labs around the world, bringing you lab-quality results in the comfort of your home.
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Tests Conducted | Proven and Reliable - Join millions who trust our cutting-edge solutions to provide clarity and confidence on their fertility journey.
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Countries | Globally Trusted - From leading labs to at-home solutions, our advanced systems are relied on by families in over 50 countries.

Trusted by Labs, Loved by Families

Our commitment to excellence has garnered the trust of esteemed organizations such as US Fertility, Kaiser Permanente, LabCorp, the US Military, and numerous others. Their reliance on MES speaks volumes about the accuracy and reliability of our products, the quality of our reported results, and our dedication to high-quality client support.

What YO Reports


  • Concentration

    YO reports the number of sperm cells in your semen sample (per ML.)

  • Motility

    Motility is the percentage of your sperm cells that are alive and moving (%.)

  • Progressive Motility

    Progressive Motility is the percentage of sperm cells that make forward progress (%.)

  • MSC / PMSC

    Motile sperm and Progressively Motile sperm represented as a total (per ML.)

The Global Leader in  Male Fertility  Testing Solution.

Welcome to Medical Electronic Systems, or MES for short, your trusted partner in the world of cutting-edge medical device solutions. At MES, we are driven by a singular mission: to revolutionize the field of fertility testing with our automated semen analysis solutions.

Remember, it All Started with A Sperm and an Egg!

Why Our Clients Love Us


  • "My husband and I spent over $1,000 at a fertility clinic but never got to see results like this. At the clinic, his results were just numbers on paper, but with this machine, we could actually see what’s causing our infertility. Highly recommend!"

  • "Make sure to read the instructions thoroughly! You’ll need a fully charged phone to use this device, as it connects through a private Wi-Fi via the app (not through a cable). The results are fast and accurate, and the live sample view is as described. Having 2 tests included and the option to buy refills is a great bonus!"

  • "Definitely an easy way to obtain results. Just follow the instructions and you will be fine. We had no issues with this test and would use it again. Arrived on time and very easy to use with your phone and obtain the app."

  • "I would highly recommend this item for anyone that need a piece of mind for who is worried. This is a start to the process but would see a professional after getting result no matter the result."

  • "Amazing!! If you are not sure if you should try it, you need to try this! its very accurate. if you are having issue conceiving and are worried it might be sperm related you need to try this."

  • "Works fine and give you a piece of mind if you have any doubts. I liked the fact that I could access to the videos at anytime."

YO is Future Proof

The World Health Organization (WHO) publishes comprehensive guidelines for male fertility testing and treatment. Medical Electronic Systems (MES) and YO Home Sperm Test adhere to the latest WHO standards, as outlined in the current 6th Edition Manual.

As an industry leader in the fertility space, MES is dedicated to meeting not only current WHO standards, but also all FDA, ASRM, AUA, CLIA, CAP, and international regulatory standards to provide a world-class solution for couples and men worldwide.