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Institute for Reproductive Health Georgetown University

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The Standard Days Method

and CycleBeads

A Simple Fertility Awareness-based Approach to

Family Planning

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Presentation Outline

What is the SDM?

What is the scientific basis of the SDM?

How does the SDM work?

How are programs introducing the SDM?

Why introduce the SDM?

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What is the Standard Days Method?

Expands family planning options

Helps programs meet demand for a simplenatural method.

Is a method that:

involves both partners

doesnt require costly imported commodities

offers opportunities for improvedcommunication

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How does the SDM work?

Helps a couple avoid unplannedpregnancy by knowing which daysthey should not have unprotectedintercourse.

Identifies days 8-19 of the cycleas fertile

Is appropriate for women withmenstrual cycles 26-32 days long.

Uses a color-coded string ofbeadsCycleBeadsto helpwomen keep track of their cycledays and know when they are

fertile.

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CycleBeads

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Levels and Trends of Contraceptive Use as Assessed in 2002. United Nations, ReportST/ESA/SER.A/239 New York, 2006

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Who can use the SDM?

Women who usually have cycles between 26and 32 days long.

Couples who can avoid unprotected sex duringthe womans fertile days.

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The Standard Days Method does not

protect against sexually transmittedinfections (STIs) or HIV/AIDS.

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Scientific Basis of the

Standard Days Method

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The Standard Days Method

is based onThe probability of pregnancy

relative to ovulation.

Timing of ovulation.

Viable spermup to 5 daysViable eggup to 24 hours

Menstrual Cycle mid-point3 days

0%

5%

10%

15%

20%

25%

30%

35%

-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

-4+ -3 -2 -1 0 1 2 3 4+

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Determining the Fertile Window

Day 8 Day 19

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Probability of Pregnancy from Intercourse

on Days Relative to Ovulation

0%

5%

10%

15%

20%

25%

30%

35%

-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2

Ovulatio

n

Source: Wilcox et al. 1998

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Probability of Ovulation Relative to

Midpoint of the Cycle

%

ofcycles Peak day used

as proxy ofovulation

4.38

12.1

18.4

30.1

11.9

5.6

2.4 0.9

>