Ethics and eggs

Ethical concerns mean reproductive medicine is heavily regulated in China. For more than 30 years, the national family planning policy limited most couples to one child, and boys were favored over girls. Surrogacy and trading in ova are also illegal. As a result, egg freezing is highly regulated, and is not available to single women who want to prolong fertility.

Qin sympathized with Liu's predicament. "When it comes to fertility issues, it's the age of the egg that matters most," he said.

Compared with the freezing of sperm and embryos, which started in the 1960s, egg freezing has only been widely practiced since 1986, and is technically more complicated.

The American Society for Reproductive Medicine lifted the "experimental" label from the procedure in 2012, but it stressed the move should not be seen as encouraging healthy women to freeze their eggs to postpone childbearing.

Qin echoed the ASRM: "Marketing the procedure simply as a way to defer childbearing may give women false hopes."

The quality and quantity of the eggs begin to decline when women enter their 20s, but really significant deterioration happens after age 37. So, as a woman ages, it becomes increasingly difficult, and eventually impossible, for her to conceive naturally.

"To look good, women can go for plastic surgery. They can never stop the biological clock, though," Qin said, adding that he regards 23 to 28 is the ideal childbearing age range.

Mu Guangzong, a demographics expert at Peking University, said Chinese women are starting their sex lives at a younger age, but they are getting married and having children later in life.

Statistics from the latest census show that the average age of first-time mothers was 28 in 2010, two years older than the average age a decade before.

Sun Aijun, a senior gynecologist at the Peking Union Medical College Hospital, said the postponement trend has contributed to a rise in infertility. Moreover, NHFPC statistics show that at least 10 percent of Chinese women of childbearing age are infertile, more than double the figure in the 1990s.

In addition, postponing childbearing increases the health risks to both mother and baby.

"As a doctor, I feel sorry to see childbearing postponed as a result of women's liberation. They pursue careers and money at the price of missing their reproductive prime," Sun said. Infertility has led many couples to turn to IVF, which has a success rate of 40 to 50 percent. "For women older than 35, the rate is even lower," he said.

The long wait

Feng Li rues her failure to have a baby earlier in life. "Now, it's too late," the married 30-year-old said.

Like her mother, Feng Li had premature ovarian failure, and both women went through the menopause at age 29. However, her mother gave birth at age 26.

Feng Li and her husband, who both work low-paid temporary jobs in Beijing, long to have a child. They are waiting for an egg to be provided by a donor, but the process is time-consuming because the regulations stipulate that ova can only be donated by women undergoing IVF treatment. In extreme cases, couples have waited 10 years.

"All I can do is to wait. We can't afford treatment overseas, where it's much easier to obtain donated eggs. Because of my special circumstances, I could have frozen my eggs at a younger age, but I missed out," said Feng Li, who hadn't realized she could fall prey to the same condition as her mother.

Sun urged women to be aware of their ovarian health and plan on having children as early as they can, based on their fertility, which can be determined by a blood test that measures the level of Anti-Mullerian hormone, a protein that indicates ovarian function.

He said egg freezing could help single women with declining ovarian function, but warned: "Freezing the eggs could be an option, but it's not like your fertility is in a safe."

According to Qin Lang, the physician, health experts have long regarded egg freezing as an experimental procedure, and the success rate is lower than for procedures such as embryo freezing or the use of fresh donor eggs. On average, about 80 percent of eggs can be used after thawing.

Again, age matters. International studies indicate that the odds of successful treatment are higher if the women are young when they freeze their eggs.

The process involves time, money and discomfort, he added. Women using egg-freezing services undergo ovarian hyperstimulation to prompt egg development. Additionally, egg retrieval can cause pain and infection in the pelvis and abdomen, and injury to the bladder, bowels and blood vessels.

The potential discomfort hasn't deterred Liu. "Do the right thing at the right time and don't paint yourself into a corner," she said.

Ahead of her trip to Saipan, she admitted she's apprehensive about the egg-retrieval process, during which physicians use ultrasound to guide a long needle through the vaginal wall and into the ovary.

"They told me: 'Don't worry, it's just a half-hour outpatient procedure'. But I know that it will be the longest half-hour of my life," she said. "I can't give up, though, it's my last hope."

Contact the writer at shanjuan@chinadaily.com.cn