Kim Thornton

Dr. Kim L. Thornton is a reproductive endocrinologist at Everleap Fertility. Double board-certified in Obstetrics and Gynecology/Reproductive Endocrinology and Infertility, she specializes in all aspects of infertility treatment and family-building care.

In addition to her work at Everleap Fertility, Dr. Thornton is the Division Director of Reproductive Endocrinology and Infertility at the Beth Israel Deaconess Medical Center and an Assistant Professor in the Department of Obstetrics, Gynecology, and Reproductive Biology at Harvard Medical School. 

In 2022, she was elected to the American Society for Reproductive Medicine (ASRM) Board of Directors, where she brings wide-ranging knowledge and leadership in all facets of fertility care, scientific research, industry policymaking, and disparities in health care.  

She continues to serve as a member of the ASRM Diversity, Equality, and Inclusion Task Force, which brings together a multidisciplinary team of experts in reproductive medicine to create actionable recommendations that decrease barriers preventing women of color from accessing reproductive care.

Dr. Thornton received her medical degree from Case Western Reserve School of Medicine, completed her residency in Obstetrics/Gynecology at Wayne State University School of Medicine, and her fellowship in Reproductive Endocrinology and Infertility at Yale School of Medicine. 

• Read about Dr. Thornton’s appointment to the ASRM Diversity, Equality, and Inclusion Task Force  
• Read about Dr. Thornton’s Election to the ASRM Board of Directors  
• Watch Dr. Thornton’s ASRM presentation on the importance of culturally informed care

Accomplishments and Awards

• American Congress of Obstetricians and Gynecologists (ACOG) Fellow

Publications

1. Ghofranian A, Estevez SL, Dubois B, Gellman C, Gounko D, Lee JA, Copperman AB, Thornton K. Spironolactone use and oocyte maturation in patients undergoing controlled ovarian hyperstimulation. J Assist Reprod Genet. 2024 Aug; 41(8):1991-1996. PMID: 39060814; PMCID: PMC11339222

2. Ghofranian A, Estevez SL, Gellman C, Gounko D, Lee JA, Thornton K, Copperman AB. Fertility treatment outcomes in transgender men with a history of testosterone therapy. F S Rep. 2023 Dec; 4(4):367-374. PMID: 38204952; PMCID: PMC10774903

3. Huttler A, Thornton KL. The complexity of addressing racial and ethnic disparities. Fertil Steril. 2023 11; 120(5):987-988. PMID: 37709118

4. Thornton KL, Resetkova N. Pursuit of pregnancy by lesbian women: an opportunity to create best practice. F S Rep. 2021 Sep; 2(3):263-264. PMID: 34553146; PMCID: PMC8441552

5. Aluko A, Vaughan DA, Modest AM, Penzias AS, Hacker MR, Thornton K, Sakkas D. Multiple cryopreservation-warming cycles, coupled with blastocyst biopsy, negatively affect IVF outcomes. Reprod Biomed Online. 2021 Mar; 42(3):572-578. PMID: 33516664; PMCID: PMC10036156

6. Johnson KM, Hacker MR, Thornton K, Young BC, Modest AM. Association between in vitro fertilization and ischemic placental disease by gestational age. Fertil Steril. 2020 09; 114(3):579-586. PMID: 32709377; PMCID: PMC7487041

7. Thornton K, Merhi Z, Jindal S, Goldsammler M, Charron MJ, Buyuk E. Dietary Advanced Glycation End Products (AGEs) could alter ovarian function in mice. Mol Cell Endocrinol. 2020 06 15; 510:110826. PMID: 32339649

8. Leung A, Sakkas D, Pang S, Thornton K, Resetkova N. Assisted reproductive technology outcomes in female-to-male transgender patients compared with cisgender patients: a new frontier in reproductive medicine. Fertil Steril. 2019 11; 112(5):858-865. PMID: 31594633

9. Murphy LA, Seidler EA, Vaughan DA, Resetkova N, Penzias AS, Toth TL, Thornton KL, Sakkas D. To test or not to test? A framework for counselling patients on preimplantation genetic testing for aneuploidy (PGT-A). Hum Reprod. 2019 02 01; 34(2):268-275. PMID: 30500907

10. Asch E, Wei J, Mortele KJ, Humm K, Thornton K, Levine D. Magnetic resonance imaging performance for diagnosis of ovarian torsion in pregnant women with stimulated ovaries. Fertil Res Pract. 2017; 3:13. PMID: 28904809; PMCID: PMC5585973

11. Ibrahim Y, Haviland MJ, Hacker MR, Penzias AS, Thornton KL, Sakkas D. Elevated progesterone and its impact on birth weight after fresh embryo transfers. J Assist Reprod Genet. 2017 Jun; 34(6):759-764. PMID: 28417348; PMCID: PMC5445056

12. Maas K, Galkina E, Thornton K, Penzias AS, Sakkas D. No change in live birthweight of IVF singleton deliveries over an 18-year period despite significant clinical and laboratory changes. Hum Reprod. 2016 09; 31(9):1987-96. PMID: 27381765

13. Merhi Z, Thornton K, Bonney E, Cipolla MJ, Charron MJ, Buyuk E. Ovarian kisspeptin expression is related to age and to monocyte chemoattractant protein-1. J Assist Reprod Genet. 2016 Apr; 33(4):535-43. PMID: 26879207; PMCID: PMC4818642

14. Goldman MB, Thornton KL, Ryley D, Alper MM, Fung JL, Hornstein MD, Reindollar RH. A randomized clinical trial to determine optimal infertility treatment in older couples: the Forty and Over Treatment Trial (FORT-T). Fertil Steril. 2014 Jun; 101(6):1574-81.e1-2. PMID: 24796764

15. Karipcin FS, Moragianni VA, Milette B, Kinzer DR, Thornton KL, Barrett B, Penzias AS. Effect of steroid and antibiotic treatment during assisted hatching on IVF outcomes. Hum Fertil (Camb). 2012 Dec; 15(4):205-9. PMID: 23190298

16. Mody SK, Hacker MR, Dodge LE, Thornton K, Schneider B, Haider S. Contraceptive counseling for women who undergo bariatric surgery. J Womens Health (Larchmt). 2011 Dec; 20(12):1785-8. PMID: 21988600

17. Savchev SI, Moragianni VA, Senger D, Penzias AS, Thornton K, Usheva A. Follicular fluid-specific distribution of vascular endothelial growth factor isoforms and sFlt-1 in patients undergoing IVF and their correlation with treatment outcomes. Reprod Sci. 2010 Nov; 17(11):1036-42. PMID: 20697141

18. Eaton JL, Hacker MR, Barrett CB, Thornton KL, Penzias AS. Influence of embryo sex on development to the blastocyst stage and euploidy. Fertil Steril. 2011 Mar 01; 95(3):936-9. PMID: 20688326

19. Eaton JL, Hacker MR, Barrett CB, Thornton KL, Penzias AS. Influence of patient age on the association between euploidy and day-3 embryo morphology. Fertil Steril. 2010 Jun; 94(1):365-7. PMID: 20004892

20. Reindollar RH, Regan MM, Neumann PJ, Levine BS, Thornton KL, Alper MM, Goldman MB. A randomized clinical trial to evaluate optimal treatment for unexplained infertility: the fast track and standard treatment (FASTT) trial. Fertil Steril. 2010 Aug; 94(3):888-99. PMID: 19531445