You're in good hands.
Fellow is committed to advancing male reproductive health.
Fellow is more than a partner for clinical semen analysis. We're also at the forefront of large-scale research into best practices and factors impacting male reproductive health.
Prostate cancer detection in semen
Contact Fellow for more information
Patients want to test from home.
Scheduling semen analysis at a lab can be awkward and inconvenient, and delay fertility consultations. Our mail-in process streamlines the process and provides an elevated experience for patients.
Fertility specialists need sperm metrics prior to consultation
Easy mail-in testing helps ensure male partners are assessed up front so that both partners can be evaluated in parallel and a path to treatment can be discussed.
Better patient experience.
Better compliance.
90% of fertility patients complete Fellow semen analysis within two months. 93% of Fellow users rate us an 8 out of 10 or above.
Interested in using Fellow at your clinic?
How it works.
Results sent to you & your patients
We notify you and the patient when results are ready. Friendly, easy-to-understand reports explain key metrics.
Once a kit is purchased and activated, Fellow takes the lead. No more phone calls to coordinate testing.
Patients purchase a kit and test from the comfort of home
Make Fellow kits available
Your clinic works with a Fellow representative to identify the best ordering workflow for your practice and patients.
© 2024 Fellow Health, Inc. All rights reserved.
Large-scale PVSA compliance study published in The Journal of Urology
Prospective data were collected on 16,000+ men who received a Fellow PVSA kit between April 2021 and August 2023. Overall compliance across all practice areas was 69% at 18 weeks post-vasectomy, and 82% at 40 weeks.
Cell-free DNA from the prostate is abundant in seminal plasma, published in PLOS One
Our research shows that seminal plasma is a rich source of cell free DNA from the prostate, and provides new insights into its potential as a liquid biopsy for men's health conditions like prostate cancer, prostatitis, and more.
Factors Impacting Reproductive Health
Investigating Relationships Between Masturbation Frequency and Sexual Dysfunction in Men Undergoing Fertility Testing
Seyer et al.
ASRM 2024 Abstract
High Anxiety Is Positively Correlated with Sexual Dysfunction about Men Undergoing Fertility Testing
Lybbert et al.
ASRM 2024 Abstract
Is Poor Sleep Associated with Poor Sex? An Analysis of Sexual Dysfunction in Men with Sleep Disorders Undergoing Fertility Testing
Seyer et al.
ASRM 2024 Abstract
Sexual Function After Vasectomy is Better Compared to Those Seeking Fertility Evaluation: A Review of 7,332 Men Under 50
Deibert et al.
ASRM 2024 Abstract
Geographic Trends of Environmental Exposures for Men Pursuing Semen Analysis
Maloney et al.
ASRM 2024 Abstract
Under Pressure: Stress Is Negatively Associated with Libido and Intercourse Frequency
Seyer et al.
ASRM 2024 Abstract
Am I Normal? Ejaculate Volume Nomograms from >60,000 Individuals
Fernandez et al.
SMSNA 2024 Abstract
Exploring Men’s Health Through Fertility Assessment: Insights from a large population of men using a Fellow Semen Analysis
CUA 2024 Abstract
Belarmino et al.
Environmental Exposures in Men Pursuing Semen Analysis Testing
Maloney et al.
Mid-Atlant. AUA 2024 Abstract
Advanced Paternal Age (40 Years) and Diabetes Are Associated with Low Semen Volume in a Nationwide Cohort of Men obtaining a Fellow Semen Analysis
CUA 2024 Abstract
Belarmino et al.
Marijuana, Testosterone and Alcohol Use In Individuals Submitting Fellow Mail-In Semen Analyses: Utilizing User-Reported Survey Data to Describe Contemporary Behavior of Fertility Patients
ASRM 2023 Abstract
Morrison et al.
Tissue of origin characterization of cell free DNA in seminal plasma: Implications for new liquid biopsies
Huang et al.
PLOS One Publication
Thoreson et al.
AUA 2025 Abstract
Detection of clinically significant prostate cancer in seminal fluid using RNA biomarkers: Results from a large multi-center clinical study
Clinical Best Practices and Testing Accuracy
How Patients are Utilizing Mail-In Semen Analysis Testing for Fertility Evaluation; An Assessment of 3,159 Patients Seeking Care Online and Through Urology, REI, Obgyn, and Wellness Practices
Tolani et al.
ASRM 2024 Abstract
Screening Semen Analysis Demonstrates Significant Need for Reproductive Care
Fernandez et al.
WSAUA 2024 Abstract
Contemporary Characteristics of Men Undergoing Vasectomy Reversal
Asanad et al.
ASRM 2024 Abstract
Is a Fresh Semen Analysis Necessary for a Post Vasectomy Semen Analysis?
Rotker et al.
NE AUA 2024 Abstract
Mail-In Semen Analysis vs Fresh Sample for Post-Vasectomy Semen Analysis (PVSA): Identifying an efficient approach to achieving post-vasectomy clearance
NE AUA 2024 Abstract
Rotker et al.
Fellow Mail-In Testing Platform Permits Access to Post-Vasectomy Semen Analysis: A National Demographic Analysis
Warren et al.
CUA 2024 Abstract
Mail-In Semen Analysis Breaks Down Racial, Educational, and Income Barriers to Test Completion
PCRS 2024 Abstract
Tolani et al.
Mail-In Semen Analysis Improves Processes, Compliance, and Cost
Belarmino et al.
SGSU 2024 Abstract
Assessing Mail-In Cryopreservation for Fertility Preservation
ASCO 2023 Abstract
Belarmino et al.
Development and Validation of a Novel Mail-In Semen Analysis System and the Correlation Between One Hour and Delayed Semen Analysis Testing
Fertility & Sterility 2020
Samplaski et al.
Fellow Mail-in Testing Platform Permits Access to Post-vasectomy Semen Analysis: A National Demographic Analysis
CUA 2024 Abstract (Poster)
Belarmino et al.
Our publications
Research by Category
Mail-in SA validation study published in Fertility & Sterility
Fellow's validation study demonstrated that 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.
Mapping of Germ Cell Development and Pluripotency in Cryptorchidism
Suarez et al.
AUA 2025 Abstract
Compliance and Patient Experience
Mail-In Semen Analysis Performed Following Vasectomy Reversal Is Associated with Excellent Kit Completion Rates and Turnaround Times Independent of Socioeconomic Barriers
Asanad et al.
ASRM 2024 Abstract
Mail-In Semen Analysis: A Convenient and Potentially Time Saving Method of Fertility Evaluation
Charles et al.
ASRM 2024 Abstract
Tolani et al.
Over 90% of Fertility Patients Complete Mail-In Semen Analysis Within 2 Months
ASRM 2024 Abstract
Mail-in Semen Analysis Test System Significantly Improves Patient and Physician Experiences
Bowman et al.
WS AUA Abstract
Berk et al.
AUA 2024 Abstract
High Veterans Affairs (VA) Patient Satisfaction with Fellow Semen Analysis System
Gu et al.
AUA 2024 Abstract
High Compliance with Fellow Semen Analysis Testing across the United States Irrespective of Clinical Practice Type
Sid et al.
SE AUA 2024 Abstract
High Fertility Testing Compliance In Individuals Submitting Fellow Health Mail-In Semen Analyses Across Quality-Of-Life Domains
Tolani et al.
ASRM 2023 Abstract
Provision of Mail-In At-home Semen Analysis Kits In Clinic Improves Test Completion Rates
Gu et al.
Journal of Urology 2024
Post-Vasectomy Semen Analysis Compliance with Utilization of Mail-In Semen Analysis System
Nguyen et al.
AUA 2025 Abstract
Seminal Fluid DNA Methylation Approach Detects Clinically Significant Prostate Cancer in a Large Multi-center Clinical Study
Mail-In Semen Analysis vs Fresh Sample for Post-Vasectomy Semen Analysis (PVSA): Identifying an efficient approach to achieving post-vasectomy clearance
Rotker et al.
AUA 2025 Abstract
Is a Fresh Semen Analysis necessary for a Post Vasectomy Semen Analysis?: Assessment of Stability of Sperm Concentration over a 10-day time frame as a Model for Post Vasectomy Semen Analysis Using the Fellow System
Rotker et al.
AUA 2025 Abstract
Mail-in Semen Analysis Testing Suggests Need for Earlier and Expanded Access to Fertility Care
Tolani et al.
ASRM 2025 Abstract
Mail-in Semen Cryopreservation Toolkit Mitigates Systemic Barriers for Adolescent and Young Adult Patients
Li et al.
ASRM 2025 Abstract
The Impact of “Open” vs. “Closed” Vasectomy Technique on Rates of Azoospermia at First Post-Vasectomy Semen Analysis
NEAUA 2025 Abstract
Matson et al.
The Relationship between Age, Ejaculatory Frequency, Waiting Time to Post-Vasectomy Semen Analysis, and Clearance Rate
NEAUA 2025 Abstract
Matson et al.
Breaking Barriers in Fertility Testing: Compliance Trends in Mail-In Semen Analysis Testing Across Florida
Varela et al.
ASRM 2025 Abstract
Challenges Affecting Compliance With Mail-In Post-Vasectomy Semen Analysis in Texas
de Jesus et al.
ASRM 2025 Abstract
Mail-in Semen Analysis Requires Algorithmic Adjustment to Minimize Clinical Misclassification
Campbell et al.
ASRM 2025 Abstract
At Home and Mail-In Semen Analysis: A Critical Review of Scientific Validation, Regulatory Oversight, and Marketing Claims
Varela et al.
ASRM 2025 Abstract
A Survey of Dietary Patterns and Fast-Food Consumption Among Men Completing Mail-In Semen Analysis at Different Stages of Their Fertility Journey
Panken et al.
ASRM 2025 Abstract
Wildfire Smoke Exposure at In Vitro Fertilization Clinics in the Contiguous United States
Lillian et al.
ASRM 2025 Abstract
Fellow research at ASRM 2025
Mail-in Semen Analysis Testing Suggests Need for Earlier and Expanded Access to Fertility Care
Tolani et al.
ASRM 2025 Poster
Mail-in Semen Cryopreservation Toolkit Mitigates Systemic Barriers for Adolescent and Young Adult Patients
Li et al.
ASRM 2025 Oral Presentation
Mail-in Semen Analysis Requires Algorithmic Adjustment to Minimize Clinical Misclassification
Campbell et al.
ASRM 2025 Poster
At Home and Mail-In Semen Analysis: A Critical Review of Scientific Validation, Regulatory Oversight, and Marketing Claims
Varela et al.
ASRM 2025 Oral Presentation
Breaking Barriers in Fertility Testing: Compliance Trends in Mail-In Semen Analysis Testing Across Florida
Varela et al.
ASRM 2025 Poster
Challenges Affecting Compliance With Mail-In Post-Vasectomy Semen Analysis in Texas
de Jesus et al.
ASRM 2025 Oral Presentation
A Survey of Dietary Patterns and Fast-Food Consumption Among Men Completing Mail-In Semen Analysis at Different Stages of Their Fertility Journey
Panken et al.
ASRM 2025 Poster
Wildfire Smoke Exposure at In Vitro Fertilization Clinics in the Contiguous United States
Lillian et al.
ASRM 2025 Poster