Unlocking clinical insights with semen

Fellow provides peer-reviewed, mail-in semen analysis for clinics looking for improved compliance and a patient-friendly solution to fertility testing.

Trusted by leading urologists and reproductive specialists

Where clinical efficiency meets clinical excellence

Fellow's CLIA-certified diagnostics lab combines the ease of a mail-in semen analysis with peer-reviewed clinical performance to provide clinically valid results§in less than two business days from when a specimen reaches our laboratory.

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Fellow supports:

Clinics working with Fellow
Patient satisfaction
Up to 97% patient compliance†‡
Our Tests

Pioneering a better patient experience to maximize compliance

We dramatically improve the testing experience for patients and clinic staff members, achieving compliance rates of up to 97% (compared to an established average of about 50% for in-office testing*) while providing results that are clinically validated to be as accurate as those from a fresh semen sample analyzed within 1 hour.

The most convenient way for patients to test the success of their vasectomy.
About this kit
Easy, clinically validated semen analysis with results in less than 2 business days from when we receive a sample.
About this kit
Semen Analysis + Cryopreservation
Following a full semen analysis, secure your fertility future with our reliable cryopreservation services.
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Success Stories

Helping hundreds of providers move patient care forward

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As a high-volume vasectomy provider, Fellow post-vasectomy testing is the perfect solution for my patients as well as my practice. My patients are now able to complete their post-vasectomy semen analysis from the privacy of their own home, thereby increasing patient compliance. Once they complete testing, Fellow sends results to both me and my patient, decreasing the call volume into my practice previously required to communicate results.
David Robbins, MDUrologist at Urological Consultants of Florida, Miami, FL

Enabling breakthroughs in men's health, one sample at a time

Fellow is building a biobank of semen samples so that the most potent and accessible analyte—seminal fluid—can be used to yield breakthroughs across medical disciplines.

Our science

§ Samplaski et al. Development and validation of a novel mail-in semen analysis system and the correlation between one hour and delayed semen analysis testing; Fertil Steril. 2021;115(4):922-929

Tolani et al. Mail-in semen analysis breaks down racial, educational, and income barriers to semen analysis completion. Proceedings from the Pacific Coast Reproductive Society (PCRS) Annual Meeting 2024. Indian Wells, CA.

Gu et al. High compliance with Fellow semen analysis testing across the United States irrespective of clinical practice type. Proceedings from the American Urological Association Annual Meeting 2024. San Antonio, TX.

* Multiple publications report only 1 in 2 patients complete post-vasectomy semen analysis, including [1] Bradshaw et al., Urology, 2019, [2] Duplisea and Whelan, Journal of Urology, 2013 and [3] Johnson (Siegert) et al., Andrology & Gynecology: Current Research, 2019.