The Human Fertility Calculator
Craig Medical Distribution
The following can be a helpful resource to easily and
quickly calculate an individual's expected key fertility dates based on the mean
average of historical medical statistics relating to female menstruation,
ovulation and hormonal cycles. Please note that the results obtained from
this fertility calculator may be specifically approximate to the individual and
no guarantee as to the accuracy of these results is intended or implied. Please
see the discussion on Luteal Phase below
Most women have a luteal phase that lasts 10-14 days. With the normal average being 14 days. This is the time when the
follicle bursts, and then turns into a corpus luteum, which secretes
progesterone. In the luteal phase, estrogen is no longer the predominant hormone (as it was in
the follicular phase); instead progesterone is predominant. Progesterone production occurs
7 to 8 days after the LH surge, at the approximate time of implantation if
fertilization of the ovum has been
successful and conception has occurred. The length of the luteal phase is generally 14 days for most women unless a pregnancy occurs.
The only way to determine the exact luteal phase length for an individual's
menstrual cycle is through hormone specific blood tests. Unless you are certain
of your average Luteal phase length, use the default 14 days.
Phases of the Menstrual Cycle
Follicular Phase |
Luteal Phase |
Days 1-14 |
Days 15-28 |
Pre-ovulatory
before the mature egg is released from the ovary |
Post-ovulatory,
after the mature egg is released from the ovary |
Note: Because progesterone causes an elevation in basal body temperature, daily measurement of basal body temperature can be used to determine whether or not ovulation has occurred. Basal body temperatures cannot be used to predict ovulation, as the temperature rise does not occur until after ovulation, but can confirm that ovulation has occurred.
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