The overall success rate of In vitro fertilization (IVF), a moderately complex surgical technique for bypassing significant difficulties with achieving pregnancy, is around 25 to 50 percent per IVF treatment cycle. However, considerable variability exists between individual patients and clinics.
In vitro fertilization
Patient’s Age and Health
Younger women usually can produce many more mature, healthy eggs, although a fair number of older women with far fewer viable eggs have successfully carried IVF-induced pregnancies to term. Vigorous, healthy sperm will increase the probability of a fertilized egg in the laboratory, and a healthy, normally shaped uterus without scarring or other abnormalities will be more likely to accept implantation of the fertilized egg.
In the United States, the number of live births per IVF treatment cycle initiated varies for women of different ages.
Women aged 34 or younger: approximate success rate 30 to 35 percent.
Women between 35 and 37 years old: approximate success rate 25 percent.
Women between 38 and 40 years old: approximate success rate 15 to 20 percent.
Women over 40 years old: approximate success rate 6 to 10 percent.
Clinical Skill and Experience
With all other factors being equal, a skilled, experienced team of talented IVF clinicians will accumulate a significantly better record of successful pregnancies. Also, individual clinics may exhibit unique approaches to overall treatment. There are reports on individual clinics in the United States at the Centers for Disease Control and Prevention.
Evaluating Clinical Reputations
When comparing success rates, a prospective client should bear in mind the difference between “chemical” pregnancies and “clinical” pregnancies. A chemical pregnancy is declared when blood or urine tests show the early chemical markers associated with pregnancy, but a clinical pregnancy is declared only after confirmation with an ultrasound and clinical tests. If a miscarriage occurs during the early stages of pregnancy when there is only chemical test evidence, then it is termed as Chemical pregnancy. A miscarriage can also happen after clinical pregnancy and it is known as Clinical miscarriage.
As with any Assisted reproductive technology, the willingness of patients to endure repeated procedures will sharply improve the ultimate pregnancy rates.