János Zádori, M.D., Ph.D., M.Sc. in Health Economics and Management

János Zádori is one of the leading practitioners of in vitro fertilization (IVF) in Hungary. A veteran of over 7000 IVF treatments, Dr. Zádori has attracted patients from Hungary, Romania, Serbia, Italy, Great Britain and the USA.

After graduation in 1992 Dr. Zádori began his residency in Obstetrics and Gynecology at the Albert Szent-Györgyi School of Medicine in Szeged. Following his residency program he joined the largest private in vitro fertilization center network in Hungary, The Kaali Institute affiliate in Szeged.

Through his commitment to continuing research, Dr. Zádori remains up-to-date on the latest developments in IVF. His research has focused on obstetric and perinatal outcome following assisted reproduction, safety of in vitro fertilization and the genetic background of polycystic ovarian syndrome. He has forty publications and abstracts to his credit in peer reviewed journals (cumulated impact factor 47.245, cited reference index: 241 Google Scholar), as well as contributions to two widely-read texts. He also serves as a reviewer for more of the leading publications in his field.

As a result of his commitment to research, Dr. Zádori was awarded a Ph.D. from the University of Szeged. His dissertation focused on assessment of obstetric risk following IVF procedures.

Dr. Zádori’s commitment to excellence has been recognized by leading organizations in the IVF field. He has been selected for membership in the European Society of Human Reproduction and the International Association of Private Assisted Reproductive Technology Clinics and Laboratories.

Dr. Zádori received his medical degree from the Albert Szent-Györgyi School of Medicine in Szeged, where he now teaches courses in infertility and assisted reproduction. Shortly after graduation he was chosen by the prestigious Albert Einstein College of Medicine in New York to serve as a visiting research associate. He also has a degree in health economy and management.

Important publications

  • J Zadori, A Gecse, Z Mezei, G Telegdy
    The effect of angiotensin I and III on the arachidonate cascade of brain microvessels
    Acta Physiol Hung. 1990;75 Suppl:303-304.

  • Z Kozinszky, H Orvos, J Zadori, T Zoboki, M Katona, A Pal, L Kovacs
    Perinatal outcome of primiparas over 35 years of age (35 éven felüli először szülő nők terhessége és újszülöttjeinek neonatológiai jellemzői)
    Magyar Nőorvosok Lapja 2002;65: 249-255. (Hungarian Journal of Gynecologists)

  • Z Kozinszky, J Zadori, H Orvos, M Katona, T Zoboki, A Pal, L Kovacs
    Risk of Caesarean section in singleton pregnancies following assisted reproductive technology
    Journal of Reproductive Medicine 2003;48(3):160-164.

  • J Zadori, Z Kozinszky, H Orvos, M Katona, SG Kaali, A Pal
    The incidence of major birth defects following in vitro fertilization
    Journal of Assisted Reproduction and Genetics 2003;20(3):131-132.

  • J Zadori, A Pal, SG Kaali
    Isolation of ejaculated spermatozoa six hours after unsuccesful testicular biopsy in non-obstructive azoospermia
    Journal of Assisted Reproduction and Genetics 2003;20(4):160-162.

  • J Zadori , Z Kozinszky, H Orvos, M Katona, A Pal, L Kovacs
    Dilemma of increased obstetric risk in pregnancies following IVF-ET
    Journal of Assisted Reproduction and Genetics 2003;20(6):216-221.

  • Z Kozinszky, J Zadori, H Orvos, M Katona, A Pal, L Kovacs
    Obstetric and neonatal risk after assisted reproductive technology: a matched control study
    Acta Obstetricia & Gynecologica Scandinavica 2003;82(9):850-856.

  • J Zadori, Z Kozinszky, H Orvos, M Katona, SG Kaali, A Pal
    Birth weight discordance in spontaneous versus induced twins: impact on perinatal outcome
    Journal of Assisted Reproduction and Genetics 2004;21(3):85-88.

  • I Sinko, M Morocz, J Zadori, K Kokavszky, I Rasko
    Effect of cigarette smoking on DNA damage of human cumulus cells analyzed by comet assay
    Reproductive Toxicology 2005;20(1):65-71.

  • Zs Kormanyos, G Nemet, J Zadori, A Pal
    Bilateral extrauterine gravidity following assisted reproduction (Halmozott ektópiás terhesség előfordulása asszisztált reprodukciós kezelést követően)
    Magyar Nőorvosok Lapja 2005;68(5.):337-339. (Hungarian Journal of Gynecologists)

  • P Kovacs, T  Kovats, A Bernard, J Zadori, G Szmatona, SG Kaali
    Comparison of serum and follicular fluid hormone levels with recombinant and chorionic gonadotropin during in vitro fertilization
    Fertility & Sterility 2008; 90(6): 2133-2137

  • S Csatordai, Z Kozinszky, I Devosa, R Dudas, E Toth, J Sikovanyecz, D Szabo, J Zadori, K Barabas, A Pal
    Validation of the Leverton questionnaire as a screening tool for postnatal depression in Hungary
    General Hospital Psychiatry 2009;31(1):56-66.

  • Z Kozinszky, R Dudas, S Csatordai, I Devosa, E Toth, J Sikovanyecz, D Szabo, J Zadori, K Barabas, A Pal
    Social dynamics of postpartum depression: a population-based screening in South-Eastern Hungary
    Social Psychiatry and Psychiatric Epidemiology 2010; 46(5): 413-423.

  • Cs Pribenszky, P Kovacs, Sz. Matyas, E Losonczi, J Zadori, G Vajta
    Pregnancy achieved by transfer of a single blastocyst selected by timelapse monitoring
    Reproductive Biomedicine Online 2010; 21(4): 533-536.

Invited Comment by the Editor on

  • Shevell et al. Pregnancies resulting from assisted reproductive technology were associated with an increased risk of specific negative outcomes.
    J ZadoriEvidence Based Obstetrics & Gynecology 2006; (8)3-4: 110-111.

Important abstracts

  • Anaerobic Bacteria Can Arrest Sperm Motility During In Vitro Fertilization Treatment – BG Molnar, I Szoke, I Sinko, J Zadori, E – Program Supplement to Fertility and  Sterility, Vol.70, No. 3, Suppl. 1, Sept.1998
  • Magnesium in Obstetrics and Gynaecology – BG Molnar, J Zadori, L Kovacs – MAGNESIUM Compilation from the oral and poster presentations of the 6th European Magnesium Congress 1998
  • Varicocelectomy in severe oligozoospermia – J Zadori, BG Molnar, I Sinko, K Kokavszky, L Torok – Abstracts from the First World Congress of A PART, Journal of Assisted Reproduction and Genetics, Vol. 16, Number 3, 1999
  • Effects of anastrozole (Arimidex) on the human granulosa cell steroid biosynthesis in vitro – I Foldesi, J Zadori, K Kokavszky, L Kovacs, A Pal – Posters / European Journal of Obstetrics & Gynecology and Reproductive Biology 91 (2000) S 51
  • Comet assay for testing reproductive toxicity – I Sinko, M Morocz, J Zadori, M Krizsan, K Kokavszky, I Rasko – Abstracts from the Second World Congress of A PART, Journal of Assisted Reproduction and Genetics, Vol. 17, Number 8, 2000
  • In vitro steroid biosynthesis of human granulosa cells derived from clomiphene citrate-gonadotropin or GnRHa-gonadotropin stimulated cycles –  I Foldesi, J Zadori, K Kokavszky, A Pal – Abstracts from the Second World Congress  of A PART, Journal of Assisted Reproduction and Genetics, Vol. 17, Number 8, 2000
  • The relationship between basal oestrogen production of cultured granulosa cells and corresponding serum oestrogen levels measured on day of HCG administration in patients undergoing IVF – I Foldesi, J Zadori, K Kokavszky, A Pal – Human Reproduction Volume 16 Abstract Book 1, 17th Annual Meeting 2001
  • The prevalence of Chlamydia trachomatis in couples participating in assisted reproduction – J Deak, M Krizsan, J Zadori, E Nagy – Journal of Clinical Virology Vol.22, No 2 Sept. 2001. Abstracts of the 5th Annual ESCV Meeting
  • Pregnancy outcome of singleton pregnancies following IVF-ET – Z Kozinszky, H Orvos, J Zadori, T Zoboki, M Katona, A Pal, L Kovacs – Ceska Gynekologie Suppl. 2 Book of Abstracts. 17th European Congress of Obstetrics and Gynaecology (2001)
  • Is assisted reproduction a risk factor for singleton pregnancy? – Z Kozinszky, H Orvos, J Zadori, T Zoboki, M Katona, A Pal – Human Reproduction Vol. 17 Abstract book 1, 18th Annual Meeting ESHRE, Vienna 2002
  • In vitro steroid biosynthesis of granulosa cells harvested from hyperstimulated cycle without ovulation induction – I Foldesi, J Zadori, M Krizsan, SG Kaali, A Pal – Abstracts from the 4th World Conference of A PART, Journal of Assisted Reproduction and Genetics, Vol. 19, Number 5, 2002
  • Analysis of urinary FSH, LH levels and steroid glucuronide metabolites during recombinant FSH and human menopausal gonadotropin ovarian stimulation – J Zadori, I Foldesi, A Pal, SG Kaali – Abstracts from the 4th World Conference of A PART, Journal of Assisted Reproduction and Genetics, Vol. 19, Number 5, 2002
  • Angiotensinogen M235T polymorphism in polycystic ovarian syndrome – Z Kozinszky, J Zadori, H Lehotzky, I Foldesi, Gy Abraham,  P Legradi, E Horvath, Zs Laszlo, J Szabo, A Pal, SG – Abstracts from the 4th World Conference of A PART, Journal of Assisted Reproduction and Genetics, Vol. 19, Number 5, 2002
  • Are cardiovascular diseases after polycystic ovarian syndrome genetically coded? – Z Kozinszky, J Zadori, H Lehotzky, I Foldesi, J Daru, E Horvath, Zs Laszlo,  J Szabo , SG Kaali, A Pal – Human Reproduction Vol. 18 Supplement 1: Abstract book, 19th ESHRE Annual Meeting, Madrid 2003
  • Polymorphism in coagulation genes in women with polycystic ovarian syndrome – Z Kozinszky, J Zadori, H Lehotzky, I Foldesi, J Daru, E Horvath, Zs Laszlo, J Szabo, SG Kaali, A Pal A. – Abstracts from the 5th World Conference of A PART 2003, Tokyo. Proceedings.
  • How can you determine the risk of assisted reproduction? - J Zadori, Z Kozinszky, H Orvos, M Katona, A Pal, SG Kaali – Abstracts from the 5th World Conference of A PART 2003, Tokyo. Proceedings.
  • Analysis of perinatal complications among twin pregnancies after assisted reproduction in comparison with spontaneous twin pregnancies – A Pal, Z Kozinszky, I Nyirati, J Zadori, H Orvos, M Katona – International Journal of Gynecology & Obstetrics, Vol. 83, Supplement 3: Abstracts from the XVII FIGO World Congress of Gynecology and Obstetrics 2003, Santiago, Chile
  • Search for genes in polycystic ovarian syndrome – Z Kozinszky, J Zadori, H Lehotzky, I Foldesi, J Daru, E Horvath, Zs Laszlo,  J Szabo, SG Kaali, A Pal – Human Reproduction Vol. 19, Supplement 1: Abstract book, 20th ESHRE Annual Meeting, Berlin 2004
  • Concerns about IVF: increased incidence of small-for-gestational-age neonates – J Zadori, Z Kozinszky, H Orvos, M Katona, M Krizsan, SG Kaali, A Pal – Human Reproduction Vol. 19, Supplement 1: Abstract book, 20th ESHRE Annual Meeting, Berlin 2004
  • Safety, efficacy and quality in ART: mission impossible? – J Zadori, M Krizsan, H Orvos, Z Kozinszky, A Pal (2004): Safety, efficacy and quality in ART: mission impossible? – Abstracts from the XXVI. Alpe Adria Meeting of Perinatal Medicine, Graz 2004
  • Primary endpoint of assisted reproduction: healthy, singleton birth – A Pal, J Zadori, M Krizsan, H Orvos, Z Kozinszky, SG Kaali – Abstracts from The Asian Pacific Congress on Controversies in Obstetrics, Gynecology and Infertility, Bangkok 2004
  • Determination of HSV serovalence in different south-Hungarian population groups – J Deak, Z Kozinszky,  A Pal, T Nyari, J Zadori, JS Smith – Acta Microbiologica et Immunologica Hungarica Vol. 52, 2005, Supplement.
  • Herpes Simplex Virus-2 and –1 seroprevalence in selected population groups in Hungary  – J Deak, Z Kozinszky, A Pal, T Nyari, J Zadori, JS Smith – Herpes the Journal of the International Herpes Management Forum, Vol. 12. 12th Annual Meeting, Abstracts. 2005.
  • Insulin directly inhibits the basal and gonadotropin-induced estradiol production of human granulosa cells in vitro – I Foldesi, T Nadasi, Z Kozinszky, J Zadori, M Krizsan, A Pal – Human Reproduction Vol.22, Supplement: Abstract book 23th ESHRE Annual Meeting,Lyon 2007
  • Comparison of serum and follicular fluid hormone levels with recombinant and chorionic gonadotropin during in vitro fertilization – P Kovacs, T Kovats, A Bernard, G Szmatona, J Zadori, SG Kaali – Fertility & Sterility 2007; 88: S34-S34 Suppl. 1 SEP 2007
  • Herpes Simplex Virus-1 and -2 type specific seroprevalence and associated risk factors in select population groups in Hungary – J Deak, Z Kozinszky, A Pal, J Zadori, JS Smith – 15th Annual Meeting of the European Sopciety for Clinical Virology and Joint Meeting with the European Society for Veterinary Virology Madrid 2012
  • Anaesthesia for follicle punction in IVF procedure – M Zimanyi, I Szegesdi, J Zadori 2013