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Healthy women are fertile from puberty until menopause, although fertility is typically much reduced towards the extremes of this period. The onset of puberty is typically identified by menarche and the presence of secondary sexual characteristics such as breast development, the appearance of pubic hair and changes to body fat distribution.
The Creighton Model FertilityCare System (Creighton Model, FertilityCare, CrMS) is a form of natural family planning which involves identifying the fertile period during a woman's menstrual cycle. The Creighton Model was developed by Thomas Hilgers, the founder and director of the Pope Paul VI Institute .
An ova bank, or cryobank, or egg cell bank is a facility that collects and stores human ova, mainly from ova donors, primarily for the purpose of achieving pregnancies of either the donor, at a later time (i.e. to overcome issues of infertility), or through third party reproduction, notably by artificial insemination.
DNA testing is rarely carried out to confirm claims of maternity at advanced ages, but in one large study, among 12,549 African and Middle Eastern immigrant mothers, confirmed by DNA testing, only two mothers were found to be older than fifty, the oldest mother being 52.1 years at conception (and the youngest mother 10.7 years old).
Fertility: Assessment and Treatment for People with Fertility Problems. London: RCOG Press. 2004. ISBN 978-1-900364-97-3. Chandra A, Copen CE, Stephen EH (August 2013). "Infertility and impaired fecundity in the United States, 1982-2010: data from the National Survey of Family Growth". National Health Statistics Reports (67): 1–18. PMID 24988820.
In unexplained infertility abnormalities are likely to be present but not detected by current methods. Possible problems could be that the egg is not released at the optimum time for fertilization, that it may not enter the fallopian tube, sperm may not be able to reach the egg, fertilization may fail to occur, transport of the zygote may be disturbed, or implantation fails.
A woman practicing symptoms-based fertility awareness may choose to observe one sign, two signs, or all three. Many women experience secondary fertility signs that correlate with certain phases of the menstrual cycle, such as abdominal pain and heaviness, back pain, breast tenderness, and mittelschmerz (ovulation pains).
The Billings ovulation method is a method in which women use their vaginal mucus to determine their fertility. [3] It does not rely on the presence of ovulation, rather it identifies patterns of potential fertility and obvious infertility within the cycle, whatever its length. Effectiveness, however, is not very clear. [3]
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