Does egg-sharing compromise the chance of donors or recipients achieving a live birth?

Background: To evaluate the effect of egg-sharing and the outcome of assisted reproductive treatment (ART) in standard IVF/ICSI patients, egg-sharing donors and egg-sharing recipients.

Methods: Descriptive cohort study to evaluate 276 egg-sharing cycles involving 192 egg-sharers, 274 recipient cycles receiving eggs from egg-sharers and 1098 non-egg-sharing standard IVF/ICSI cycles from January 1998 to December 2002. Patients were divided into three groups: group A, egg-sharers; group B, non-egg-sharers, age <36 years, FSH <10 IU/l, BMI <30 kg/m(2); and group C, egg-sharing recipients, all ages.

A survey of anonymous oocyte donors: demographics.

This is a questionnaire based study of 501 women enquiring about anonymous oocyte donation at a private in-vitro fertilization (IVF) unit, investigating the demographic characteristics and logistic issues involved in ovum donation. The 501 women were made up of 356 women who did not donate ('non-donors') and 145 women who eventually donated their oocytes ('donors'). Although there was a majority of housewives among the enquirers, women in full-time employment were the majority of actual donors.

Obstetric outcome in 232 ovum donation pregnancies.

Objective: To study the obstetric outcome of ovum donation pregnancies.

Design: A retrospective analysis of 232 ovum donation pregnancies in the six years from 1988 to 1993.

Setting: Infertility clinic in a private hospital.

Age of the uterus does not affect pregnancy or implantation rates; a study of egg donation in women of different ages sharing oocytes from the same donor.

The importance of age of the recipient (uterine age) with regards to pregnancy rate, delivery rate and miscarriage rate following oocyte donation was evaluated using retrospective data analysis of cases where two recipients from different age groups shared oocytes from a single donor and had equal numbers of embryos transferred. A total of 104 women (21-52 years of age) underwent a total of 104 cycles of oocyte donation. They were divided into groups according to age (group A: age 39 years or less and group B: age between 40 and 52 years).

Oocyte donation in Turner's syndrome: an analysis of the factors affecting the outcome.

A total of 29 women with Turner's syndrome (19 monosomy and 10 mosaic) had 68 cycles of oocyte donation that included 29 cycles of initial attempt and 39 cycles of subsequent attempts. Oral oestradiol valerate was used either in a variable dose (42 cycles) or in a constant dose (26 cycles) regimen for the endometrial preparation which was monitored by pelvic ultrasonography. The embryos/zygotes were transferred either fresh (50 cycles) or after cryopreservation (18 cycles) into the Fallopian tube (41 cycles) and uterine cavity (27 cycles) as appropriate.