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Dr. Karissa Hammer

MD, FACOG, Reproductive Endocrinologist and Infertility Specialist

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About Dr. Karissa Hammer

Dr. Karissa Hammer is a highly accomplished physician specializing in Reproductive Endocrinology and Infertility (REI). She earned her bachelor’s degree from Vanderbilt University, her medical degree from Rush University, and completed her residency in Obstetrics and Gynecology at Rush. Dr. Hammer further specialized with a fellowship in REI at Massachusetts General Hospital, Harvard Medical School. She is board-certified in Obstetrics and Gynecology.

Dr. Hammer is passionate about providing comprehensive care to her patients, offering both clinical and surgical solutions tailored to their needs. Her favorite aspect of practicing medicine is building meaningful relationships with her patients and care teams, fostering a supportive and collaborative approach to treatment.

An accomplished researcher, Dr. Hammer has authored 15 scientific publications and book chapters. Her research interests include the role of Anti-Müllerian Hormone (AMH) in IVF outcomes, the influence of environmental and psychosocial factors on fertility, and innovative methods for medical education in REI. She is one of the inaugural Surgical Scholars within the Society of Reproductive Surgeons, reflecting her expertise and passion for minimally invasive surgical techniques that preserve and enhance fertility.

Dr. Hammer is dedicated to helping individuals and couples take meaningful steps in their reproductive journeys, guiding them with compassion and expertise as they work toward fulfilling their dreams of building a family.

Education

Vanderbilt University; Rush University

Residency

Residency: Rush University Medical Center, Chief Resident
Fellowship: Harvard Medical School / Massachusetts General Hospital

Awards

  • 2008-2011 Auxiliary of Good Shepherd Hospital Scholarship
  • 2015 Department of OBGYN Outstanding Senior Medical Student Award
  • 2018 Professional in Training Scholarship, Pacific Coast Reproductive Society
  • 2018 Travel grant for Pathways in Reproductive Medicine Program
  • 2019 Pacific Coast Reproductive Society Merit Scholarship
  • 2020 Pacific Coast Reproductive Society Merit Scholarship
  • 2021 Patient Safety Star, Massachusetts General Hospital
  • 2022 Midwest Reproductive Symposium International Best Poster Prize
  • 2022 Midwest Reproductive Symposium International Training Scholarship
  • 2024 Society of Reproductive Surgeons Surgical Scholar

We Offer Comprehensive Fertility Support, Egg Bank, and Surrogacy Services

Whatever you are facing, we're dedicated to finding the right solution for you. At our award-winning network of clinics, you’ll receive expert care and the support you need to confidently move forward on your fertility journey.

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Fertility Treatments

Whether you’re a first-time patient exploring your fertility options or a returning patient ready to grow your family, we offer a full range of treatments, including IVF, IUI, and genetic testing, all tailored to your unique needs.
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Surrogacy Services

We guide intended parents and those seeking to become a surrogate through matching, legal, and medical support to delivery and beyond. Our agency offers concierge-level benefits from a team with first-hand experience, ensuring personalized, understanding care.
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LGBTQ+ Services

We proudly support LGBTQ+ individuals and couples on their family-building journey. With our fertility treatments, egg bank, and surrogacy services all under one network, we offer everything you need to build your family.
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Egg Bank

Whether you are an intended parent seeking donor eggs or someone looking to donate, we’re the trusted choice. Our skilled medical team ensures excellent care for donors, while our expert labs maintain the highest quality and handling of donor eggs.