Category Archives: Fertility Doctor

Fertility Doctor Treating Secondary Infertility

While it is mainstream for a couple to seek out the help of a fertility doctor after they have tried unsuccessfully to get pregnant for a year, a typical case of secondary infertility can go undiagnosed. Primary infertility is diagnosed when a couple fails to conceive after one year of regular, unprotected sex. For women over 35, this time period is shortened to six months. Secondary infertility is diagnosed when a couple has been successful in conceiving a child, but then is unable to conceive more children.


Dr. John Zhang is renowned for successfully treating couples suffering from secondary infertility. Older men and women considered poor responders are turned down by other fertility clinics offering In Vitro Fertilization (IVF).

Dr. John Zhang welcomes patients representing a challenge, regardless of their potential adverse affect on his pregnancy success rates. The Doctor completed his clinical training at NYU and holds a PhD in IVF from Cambridge. With over two decades of experience in Reproductive Endocrinology, the Doctor is a leading authority performing a vast array of IVF methods.

  • Conventional IVF – large dosages of fertility medication are administered to produce 10+ egg follicles for fertilization in vitro
  • Mini-IVF™ – minimal dosages of fertility medications are administered to produce between 3 and 5 eggs for fertilization in vitro
  • Natural Cycle IVF – no fertility medications are administered and one good natural egg is harvested for fertilization in vitro

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