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the phone. This difference between the RF test measurement and actual
RF emission is because test measurements are limited by instrument
accuracy, because test measurement and actual use environments are
different, and other variable factors. This inherent variability is known as
“measurement uncertainty.” When FCC conducts post-grant testing of a
cell phone, FCC takes into account any measurement uncertainty to
determine whether regulatory action is appropriate. This approach
ensures that when FCC takes regulatory action, it will have a sound,
defensible scientific basis.
RF emission is because test measurements are limited by instrument
accuracy, because test measurement and actual use environments are
different, and other variable factors. This inherent variability is known as
“measurement uncertainty.” When FCC conducts post-grant testing of a
cell phone, FCC takes into account any measurement uncertainty to
determine whether regulatory action is appropriate. This approach
ensures that when FCC takes regulatory action, it will have a sound,
defensible scientific basis.
FDA scientific staff reviewed the methodology used by FCC to measure
cell phone RF, and agreed it is an acceptable approach, given our current
understanding of the risks presented by cellular phone RF emissions. RF
emissions from cellular phones have not been shown to present a risk of
injury to the user when the measured SAR is less than the safety limits
set by FCC (an SAR of 1.6 w/kg). Even in a case where the maximum
measurement uncertainty permitted by current measurement standards
was added to the maximum permissible SAR, the resulting SAR value
would be well below any level known to produce an acute effect.
Consequently, FCC’s approach with measurement uncertainty will not
result in consumers being exposed to any known risk from the RF
emitted by cellular telephones.
cell phone RF, and agreed it is an acceptable approach, given our current
understanding of the risks presented by cellular phone RF emissions. RF
emissions from cellular phones have not been shown to present a risk of
injury to the user when the measured SAR is less than the safety limits
set by FCC (an SAR of 1.6 w/kg). Even in a case where the maximum
measurement uncertainty permitted by current measurement standards
was added to the maximum permissible SAR, the resulting SAR value
would be well below any level known to produce an acute effect.
Consequently, FCC’s approach with measurement uncertainty will not
result in consumers being exposed to any known risk from the RF
emitted by cellular telephones.
FDA will continue to monitor studies and literature reports concerning
acute effects of cell phone RF, and concerning chronic effects of long-
term exposure to cellular telephone RF (that is, the risks from using a
cell phone for many years). If new information leads FDA to believe that
a change to FCC’s measurement policy may be appropriate, FDA will
contact FCC and both agencies will work together to develop a
mutually-acceptable approach.
acute effects of cell phone RF, and concerning chronic effects of long-
term exposure to cellular telephone RF (that is, the risks from using a
cell phone for many years). If new information leads FDA to believe that
a change to FCC’s measurement policy may be appropriate, FDA will
contact FCC and both agencies will work together to develop a
mutually-acceptable approach.
Updated July 29, 2003