basal body temperature (bbt)
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BASAL BODY
TEMPERATURE (BBT)
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Objectives
Explain BBT as a method on NFP Conduct initial instruction on the use
of BBT method
Distinguish the fertile and infertilephases of the menstrual cycle usingthe BBT
Explain BBT rules to postponepregnancy
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BBT definition
Is a method in identifying the fertileand infertile period of a womans cycleby daily taking and recording of the risein body temperature during and after
ovulation. Is the temperature of the body at rest
at least 3 hrs. of continuous sleepbefore temperature taking
A womans BBT rises during ovulationperiod and stays high until the nextmenstruation due to rise inprogesterone level.
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How to take the
temperature Use an ovulation thermometer Take the temperature every morning upon
waking and before any activity Thermometer is placed under the tonqueor the axilla for five minutes
Be consistent in using the thermometer
Use the same route throughout cycle one
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How to record
After taking the temperature, recordreading immediately
If the mercury is between two readings,
always chart the highest reading Record by placing a dot at the center of
the box
Connect dots marking the temperature ona daily basis
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Who records Ideally the husband, however if he isnot around, the woman can do it
herself
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How to establish cover
line (WHO) Identify the first 10 temperature reading
of the cycle
Disregard temperature on days 1-5 Find the highest temperature on days 6-10 Disregard any temperature that is
abnormally high due to illness
Draw a horizontal line along the highesttemperature on days 6-10. This is theCOVERLINE
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How to find the thermal
shift The temperature usually rises (from .4*Fto 1*F or from .05*C to .20*C)above thehighest of the previous low temperaturepattern. This is called the thermal shift.
Once the temperature has remained highfor 3 consecutive days, ovulation has
occured
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Fertile and infertile days?
After the coverline has been established,count the first 3 consecutive temperatureabove this cover line and mark 1,2,3
Draw a vertical line between 2 and 3
Fertile days are to the left of the verticalline and infertile days are all days to theright of the vertical line
Establish the pattern of use for 3 months
and discuss with a service provider toassist in interpreting the data
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BBT Rules to Postpone
Pregnancy Lovemaking or intercourse can bedone during the third day of the
thermal shift until the end of thecycle. (Post Ovulatory or InfertilePhase
Intercourse is to be avoided duringfertile days to prevent pregnancy
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Guidelines for achievingpregnancy
A woman who wants to have a child canpractice the BBT method by doing thefollowing:
Observe the signs and symptoms of themenstrual cycle Time the sexual intercourse during the
fertile period for a day or two between
each intercourse so that the husbandssemen will have the maximum number ofsperms.
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Guidelines for achieving
pregnancy Take the basal body temperature
daily. If the temperatureremains elevated for a longerperiod than the previous
menstrual cycle, it is likely thatshe is pregnant.
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Effectiveness
Perfect use : 99 percent
Typical use : 80 percent
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Advantage/Disadvantage
It can be used by any woman ofreproductive age who is willing to takeand chart her BBT daily and practiceabstinence during fertile periods.
There are no medical precautionsagainst the use of BBT. However, thefollowing conditions can affect the BBT:
*Sore throat, colds and flu, fever,toothache, vomitting, diarrhea,anxiety, sunburn, medication,travel, sleep disturbance and
alcoholic beverages.
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BBT
HANDS ON EXERCISE
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