What Affects the Test
For all methods
Fertility awareness methods will
not work very well:
- If they are not used consistently.
- During stressful times or times when cycles are irregular,
after a baby is born, after you stop taking birth control pills, or just before
- If both partners are not
willing to work together to use them.
Calendar (rhythm) method
The calendar method will
not work very well if:
- You have irregular, short, or long menstrual
- You breast-feed for more than 6 months.
supplement breast-feeding with bottle-feeding.
Basal body temperature (BBT) method
The BBT method
will not work well if you:
- Have a fever.
- Take some
medicines, such as aspirin.
- Are traveling, having problems
sleeping, or having other stress.
- Use a different thermometer, take
the thermometer out too soon, take your temperature at a different time of day,
or take your temperature in a different way.
Cervical mucus method (Billings method)
cervical mucus method will not work very well if you:
- Use vaginal lubricants or
- Are breast-feeding.
- Have a vaginal
- Are close to
The results of hormone
monitoring may not be correct if you do not follow the home ovulation kit
Combined (symptothermal) method
changes the results of one of the methods also changes the results of the
Sarah Marshall, MD - Family Medicine
Femi Olatunbosun, MB, FRCSC - Obstetrics and Gynecology
December 7, 2011
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