context: Today, in vitro fertilization ( IVF) is practically a household word. But not so long ago, it was a mysterious procedure for infertility that produced what were then known as "test-tube babies." Louise Brown, born in England in 1978, was the first such baby to be conceived outside her mother's womb. Unlike the simpler process of artificial insemination -- in which sperm is placed in the uterus and conception happens otherwise normally -- IVF involves combining eggs and sperm outside the body in a laboratory. Once an embryo or embryos form, they are then placed in the uterus. IVF is a complex and expensive procedure; only about 5% of couples with infertility seek it out. However, since its introduction in the U. S. in 1981, IVF and other similar techniques have resulted in more than 200,000 babies. When it comes to infertility, IVF may be an option if you or your partner have been diagnosed with: Endometriosis Low sperm counts Problems with the uterus or fallopian tubes Problems with ovulation Antibody problems that harm sperm or eggs The inability of sperm to penetrate or survive in the cervical mucus Poor egg quality Genetic disease of mother or father An unexplained fertility problem IVF is never the first step in the treatment of infertility except in cases of complete tubal blockage. Instead, it's reserved for cases in which other methods such as fertility drugs, surgery, and artificial insemination haven't worked. If you think that IVF might make sense for you, carefully assess any treatment center before undergoing the procedure. Here are some questions to ask the staff at the fertility clinic: What is your pregnancy ratio per embryo transfer? What is your pregnancy rate for couples in our age group and with our fertility problem? What is the live birth rate for all couples who undergo this procedure each year at your facility? How many of those deliveries are twins or other multiple births? How much will the procedure cost, including the cost of the hormone treatments? How much does it cost to store embryos and how long can we store them? Do you participate in an egg donation program? The first step in IVF involves injecting hormones so you produce multiple eggs each month instead of only one. You will then be tested to determine whether you're ready for egg retrieval. Prior to the retrieval procedure, you will be given injections of a medication that ripens the developing eggs and starts the process of ovulation. Timing is important; the eggs must be retrieved just before they emerge from the follicles in the ovaries. If the eggs are taken out too early or too late, they won't develop normally. Your doctor may do blood tests or an ultrasound to be sure the eggs are at the right stage of development before retrieving them. The IVF facility will provide you with special instructions to follow the night before and the day of the procedure. Most women are given pain medication and the choice of being mildly sedated or going under full anesthesia. During the procedure, your doctor will locate follicles in the ovary with ultrasound and remove the eggs with a hollow needle. The procedure usually takes less than 30 minutes, but may take up to an hour. Immediately following the retrieval, your eggs will be mixed in the laboratory with your partner's sperm, which he will have donated on the same day. While you and your partner go home, the fertilized eggs are kept in the clinic under observation to ensure optimal growth. Depending on the clinic, you may even wait up to five days until the embryo reaches a more advanced blastocyst stage. Once the embryos are ready, you will return to the IVF facility so doctors can transfer one or more into your uterus. This procedure is quicker and easier than the retrieval of the egg. The doctor will insert a flexible tube called a catheter through your vagina and cervix and into your uterus, where the embryos will be deposited. To increase the chances of pregnancy, most IVF experts recommend transferring up to three embryos at a time. However, this means you could have a multiple pregnancy, which can increase the health risks for both you and the babies. Following the procedure, you would typically stay in bed for several hours and be discharged four to six hours later. Your doctor will probably perform a pregnancy test on you about two weeks after the embryo transfer. In cases where the man's sperm count is extremely low or there is poor motility (movement of the sperm), doctors may combine IVF with a procedure called intracytoplasmic sperm injection. In this procedure, a sperm is taken from semen -- or in some cases right from the testicles -- and inserted directly into the egg. Once a viable embryo is produced, it is transferred to the uterus using the usual IVF procedure. Success rates for IVF depend on a number of factors, including the reason for infertility, where you're having the procedure done, and your age. The CDC compiles national statistics for all assisted reproductive technology ( ART) procedures performed in the U. S., including IVF, GIFT, and ZIFT, although IVF is by far the most common; it accounts for 99% of the procedures. The most recent report from 2016 found: Pregnancy was achieved in an average of 27.3% of all cycles (higher or lower depending on the age of the woman). The percentage of cycles that resulted in live births was 22.2% on average (higher or lower depending on the age of the woman). Any embryos that you do not use in your first IVF attempt can be frozen for later use. This will save you money if you undergo IVF a second or third time. If you do not want your leftover embryos, you may donate them to another infertile couple, or you and your partner can ask the clinic to destroy the embryos. Both you and your partner must agree before the clinic will destroy or donate your embryos. A woman's age is a major factor in the success of IVF for any couple. For instance, a woman who is under age 35 and undergoes IVF has a 39.6% chance of having a baby, while a woman over age 40 has an 11.5% chance. However, the CDC recently found that the success rate is increasing in every age group as the techniques are refined and doctors become more experienced. The average cost of an IVF cycle in the U. S. is $12,400, according to the American Society of Reproductive Medicine. This price will vary depending on where you live, the amount of medications you're required to take, the number of IVF cycles you undergo, and the amount your insurance company will pay toward the procedure. You should thoroughly investigate your insurance company's coverage of IVF and ask for a written statement of your benefits. Although some states have enacted laws requiring insurance companies to cover at least some of the costs of infertility treatment, many states haven't. Also be aware that some carriers will pay for infertility drugs and monitoring, but not for the cost of IVF or other artificial reproductive technology. Resolve: The National Infertility Association publishes a booklet called the " Infertility Insurance Advisor," which provides tips on reviewing your insurance benefits contract.