The Science Behind Our Test
The only peer-reviewed, clinically valid mail-in semen analysis.¹
In a peer-reviewed research paper published inThe Journal of Urology, Fellow demonstrated our ability to provide semen analysis results on par with traditional testing performed within 1 hour of sample production.¹ Keep reading to learn more.
Trusted by over 3,000 urologists and reproductive specialists
But wait…don't sperm die before arriving at your lab?
But wait…don't sperm die before arriving at your lab?
But wait…don't sperm die before arriving at your lab?
Good question. In short: yes, some will. Other mail-in semen analysis providers test "as-is," not accounting for the time between sample production and analysis.
Fellow accounts for this delay, and we have demonstrated that our process can provide results on par with traditional 1-hour semen analysis as long as we analyze a sample within 52 hours of when it was produced.¹
Good question. In short: yes, some will. Other mail-in semen analysis providers test "as-is," not accounting for the time between sample production and analysis.
Fellow accounts for this delay, and we have demonstrated that our process can provide results on par with traditional 1-hour semen analysis as long as we analyze a sample within 52 hours of when it was produced.¹
Good question. In short: yes, some will. Other mail-in semen analysis providers test "as-is," not accounting for the time between sample production and analysis.
Fellow accounts for this delay, and we have demonstrated that our process can provide results on par with traditional 1-hour semen analysis as long as we analyze a sample within 52 hours of when it was produced.¹
How it works
How it works
How it works
Preservation solution and temperature control
Kits include a preservation solution designed to stabilize your sample and a gel pack that helps maintain a moderate temperature during transit.
Preservation solution and temperature control
Kits include a preservation solution designed to stabilize your sample and a gel pack that helps maintain a moderate temperature during transit.
Preservation solution and temperature control
Kits include a preservation solution designed to stabilize your sample and a gel pack that helps maintain a moderate temperature during transit.
Overnight shipping included
A shipping label right on the kit, so all you have to do is drop your kit off at a UPS Store. If you are using our Vasectomy Test, UPS Ground shipping is included instead. Learn more here.
Overnight shipping included
A shipping label right on the kit, so all you have to do is drop your kit off at a UPS Store. If you are using our Vasectomy Test, UPS Ground shipping is included instead. Learn more here.
Overnight shipping included
A shipping label right on the kit, so all you have to do is drop your kit off at a UPS Store. If you are using our Vasectomy Test, UPS Ground shipping is included instead. Learn more here.
Delayed analysis algorithm
We developed and validated an algorithm that predicts degradation, allowing us to calculate results comparable to those provided by testing a fresh specimen.¹
Delayed analysis algorithm
We developed and validated an algorithm that predicts degradation, allowing us to calculate results comparable to those provided by testing a fresh specimen.¹
Delayed analysis algorithm
We developed and validated an algorithm that predicts degradation, allowing us to calculate results comparable to those provided by testing a fresh specimen.¹
Ready for Fellow?
Ready for Fellow?
Our CLIA-certified laboratory operates at a standard you can trust.
Our CLIA-certified laboratory operates at a standard you can trust.
CLIA (pronounced “KLEE-uh”) stands for Clinical Laboratory Improvement Amendments, which are federal regulations that describe the standards of quality and compliance for laboratories operating in the United States. Being CLIA-certified means that we are recognized by the federal government for meeting quality regulations for running tests that are used to help doctors and patients make health decisions. Read more about CLIA.
CLIA (pronounced “KLEE-uh”) stands for Clinical Laboratory Improvement Amendments, which are federal regulations that describe the standards of quality and compliance for laboratories operating in the United States. Being CLIA-certified means that we are recognized by the federal government for meeting quality regulations for running tests that are used to help doctors and patients make health decisions. Read more about CLIA.
Clinically validated accuracy
Fellow's validation study, published in the peer-reviewed journal Fertility and Sterility, demonstrated the accuracy of the Fellow test. Our mail-in semen analysis testing system has a strong degree of correlation between 1-hour and delayed SA testing. This test may be used in clinical practice to evaluate semen quality for fertility evaluations.
Development and validation of a novel mail-in semen analysis system and the correlation between one hour and delayed semen analysis testing
Correlation of fellow and gold standard
Independently reviewed
An independent review of our validation study noted the benefits of Fellow 's accurate mail-in test:
"The ability to perform at-home semen analyses testing has numerous clinical and patient implications, including reducing patient anxiety, improving convenience, and potentially the ability to see higher levels of patient compliance."
—Thomas A. Masterson, M.D. & Premal Patel, M.D.
An independent review of our validation study noted the benefits of Fellow 's accurate mail-in test:
"The ability to perform at-home semen analyses testing has numerous clinical and patient implications, including reducing patient anxiety, improving convenience, and potentially the ability to see higher levels of patient compliance"
—Thomas A. Masterson, M.D. & Premal Patel, M.D.
Clinical implications of home-based sperm testing
The ability to perform at-home semen analysis testing has numerous clinical and patient implications, including reducing patient anxiety, improving convenience, and potentially the ability to see higher levels of patient compliance (3).
Further, another clinically important implication of at-home testing is the potential for better standardization of results. Routine semen analysis is fraught with interobserver variability. As such, a centralized location for evaluation can minimize interobserver variability and, thus, improve the diagnostic utility of the test results
We strive to improve fertility outcomes through novel research.
We strive to improve fertility outcomes through novel research.
We strive to improve fertility outcomes through novel research.
In partnership with leading experts and universities, we have published dozens of articles and abstracts and presented at the world's top urology and fertility conferences.
In partnership with leading experts and universities, we have published dozens of articles and abstracts and presented at the world's top urology and fertility conferences.
In partnership with leading experts and universities, we have published dozens of articles and abstracts and presented at the world's top urology and fertility conferences.
The only clinically validated semen analysis that lets you produce your sample at home.
Our CLIA-certified lab and clinically validated process mean we can reliably analyze your semen within 52 hours of sample production.¹
The only clinically validated semen analysis that lets you produce your sample at home.
Our CLIA-certified lab and clinically validated process mean we can reliably analyze your semen within 52 hours of sample production.¹
The only clinically validated semen analysis that lets you produce your sample at home.
Our CLIA-certified lab and clinically validated process mean we can reliably analyze your semen within 52 hours of sample production.¹
Top doctors helped create our test, and trust us more than competitors.
Top fertility doctors at UCSF, Stanford, and USC helped validate our unique technology and approach.
Top doctors helped create our test, and trust us more than competitors.
Top fertility doctors at UCSF, Stanford, and USC helped validate our unique technology and approach.
Top doctors helped create our test, and trust us more than competitors.
Top fertility doctors at UCSF, Stanford, and USC helped validate our unique technology and approach.
Your information is secure.
Samples are analyzed in our secure, state-of-the art lab, and your data is stored in an encrypted database.
Your information is secure.
Samples are analyzed in our secure, state-of-the art lab, and your data is stored in an encrypted database.
Your information is secure.
Samples are analyzed in our secure, state-of-the art lab, and your data is stored in an encrypted database.
Success Stories
Helping thousands of providers move patient care forward
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
Success Stories
Helping thousands of providers move patient care forward
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
Success Stories
Helping thousands of providers move patient care forward
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
"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 testing from the privacy of their own home, and Fellow's results delivery has decreased call volume previously required to communicate results."
David Robbins, MD
Urological Consultants of Florida, Miami, FL
"I love the option of Fellow mail-in semen analysis testing for my patients! It’s so convenient. Fellow makes a stressful time less stressful by being able to start a workup from the comfort of your home."
Andrea Palmer, MD
OBGYN at Fenom Women’s Care, Fort Worth, TX
"I am surprised by just how fast results come to the clinic. And patients are very satisfied. Results are very explanatory and very detailed."
Julia (Patient care coordinator)
UCSF, San Francisco, CA
Work With Us
Working with Fellow is simple
and convenient
We offer urologists, fertility specialists, and OBGYNs around the country a variety of options to make our tests accessible to your patients. Request more information to hear from one of our local representatives, or write us directly at sales@meetfellow.com.
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
CLIA #05D2177822 | COLA #31245
© 2025 Fellow. All Rights Reserved.
CLIA #05D2177822
COLA #31245
© 2025 Fellow. All Rights Reserved.
CLIA #05D2177822 | COLA #31245
© 2025 Fellow. All Rights Reserved.