Freestyle Libre User Manual page 8

that generally stays flat during normal daily activities (no bending
or folding) . Choose a site that is at least 1 inch away from an insulin
injection site .
When is Sensor Glucose different from Blood Glucose:
•
Physiological differences between the interstitial fluid and capillary
blood may result in differences in glucose readings between the
System and results from a fingerstick test using a blood glucose meter .
Differences in glucose readings between interstitial fluid and capillary
blood may be observed during times of rapid change in blood glucose,
such as after eating, dosing insulin, or exercising .
What to know about interfering substances such as Vitamin C
and Aspirin:
•
Taking ascorbic acid (vitamin C) while wearing the Sensor may falsely
raise Sensor glucose readings . Taking salicylic acid (used in some pain
relievers such as aspirin and some skin care products) may slightly
lower Sensor glucose readings . The level of inaccuracy depends on the
amount of the interfering substance active in the body .
•
Test results did not indicate interference for methyldopa (used in some
drugs to treat high blood pressure) or tolbutamide (infrequently used
in some drugs to treat diabetes in the US) at maximum circulating
levels . However, concentrations of potential interferents in interstitial
fluid are unknown compared to circulating blood .
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What to know about X-Rays:
•
The Sensor should be removed prior to exposing it to an X-ray
machine . The effect of X-rays on the performance of the System
has not been evaluated . The exposure may damage the Sensor and
may impact proper function of the device to detect trends and track
patterns in glucose values during the wear period .
When to remove the Sensor:
•
If the Sensor is becoming loose or if the Sensor tip is coming out of
your skin, you may get no readings or unreliable readings, which may
not match how you feel . Check to make sure your Sensor has not come
loose . If it has come loose, remove it and apply a new one .
•
If you believe your glucose readings are not correct or are inconsistent
with how you feel, perform a blood glucose test on your finger to
confirm your glucose . If the problem continues, remove the current
Sensor and apply a new one .
What to do if you are dehydrated:
•
Severe dehydration and excessive water loss may cause inaccurate
Sensor glucose readings . If you believe you are suffering from
dehydration, consult your health care professional immediately .
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