Blood Glucose Meter Knowledge
Basic Knowledge of Glucose Meter Use
1. What is fasting blood glucose and 2 hours postprandial blood sugar?
Fasting blood glucose refers to blood collected before breakfast after an overnight fast (at least 8-10 hours without any food, except for drinking water). The detection index reflects the function of pancreatic islet B cells and generally represents the secretion function of basal insulin. It is best to measure fasting blood sugar at 6 to 8 in the morning.
2h postprandial blood glucose refers to the blood glucose level measured 2 hours from the first bite of food.
2. Why check fasting blood sugar?
Fasting blood glucose reflects the basal state and is the blood glucose level without dietary load. It is an index that best senses its own yidaosu secretion level and is a direct basis for diagnosing diabetes.
3. Why should I check my blood sugar 2 hours after a meal?
The measurement of blood sugar 2 hours after meals is also very important, because blood sugar is often high at this time, and it is easy to find problems. For some patients with type 2 diabetes, fasting blood sugar may not be high, or even It may be completely normal, but the 2-hour postprandial blood glucose is very high, far exceeding the standard for diagnosing diabetes. Therefore, when diagnosing diabetes, the 2-hour postprandial blood glucose is even more important than the fasting blood glucose.
4. How is diabetes diagnosed?
Diabetes mellitus (DM) was diagnosed when fasting blood glucose ≥7.0mmol/L or 2h postprandial blood glucose ≥11.1mmol/L.
Impressed glucose tolerance (IGT) was diagnosed when the fasting blood glucose was <7.0mmol/L, and the blood glucose was 7.8mmol/L <2h postprandial blood glucose <11.1mmol/L.
When the fasting blood glucose is between 6.1 mmol/L and 7.0 mmol/L, and the blood glucose is normal 2 h after a meal, it is diagnosed as abnormal fasting blood glucose (IGF).
5. What are the precautions when measuring blood with a blood glucose meter?
(1) Please wash your hands with soap and warm water, then dry them completely, the warm water will stimulate blood flow to your fingers.
(2) Before pricking the finger, gently shaking the hand for 10-15 seconds will help to obtain the blood sample required for the test.
(3) If you use alcohol to clean your fingers, please make sure that the alcohol has completely evaporated before pricking your fingers.
(4) For each test, choose a different test site on your finger. Repeatedly puncturing the same point on your finger may cause pain and calluses. Please do not puncture your fingertips.
(5) Press the finger firmly with the lancing pen (the deeper the pressure, the deeper the puncture.)
(6) Press the release button.
(7) Gently squeeze the finger to obtain a drop of blood.
(8) Take a blood sugar test.
6. Fingertip blood testing is not as accurate as venous blood testing, right?
Not true. The blood glucose value of the World Health Organization’s diagnostic criteria for diabetes refers to the venous plasma glucose value, while the blood glucose meter measures the fingertip whole blood glucose. The blood glucose meter is convenient and simple, suitable for self-monitoring of blood sugar, and the value is accurate, but the two values have a stable correlation coefficient of about 1.12. If the blood sugar value at the tip of your fingertip is 5.5 mmol/L, multiply by 1.12, that is The venous plasma glucose value is 6.1 mmol/L. This is not an error, it is just that the numerical standard is different.
7. Does the blood sugar of normal people fluctuate? What are its rules?
A person’s blood sugar is not static throughout the day, generally low before meals and high after meals. However, due to the regulation of endocrine hormones (including yidaosu), the blood sugar of normal people maintains a certain range whether it is fasting or after meals, and the change is not large. It is the highest half an hour to an hour after a meal, but does not exceed 11.1mmol/L, and falls below 7.8mmol/L after two hours, so there is no need to make a fuss about the normal fluctuation of blood sugar. Moreover, for people over 50 years old, for every 10 years of age, the blood sugar 1 hour after a meal can increase by 0.5mmol/L. Therefore, for the elderly over 80 years old, the blood sugar 1 hour after a meal can be as high as 10mmol/L or more.
8. What are the factors that affect blood sugar levels?
(1) Venous blood was used as the specimen. Usually, biochemical instruments are used in hospitals to measure blood sugar levels. The actual blood is drawn from venous blood, and the plasma blood sugar level is measured, while the Radiant blood glucose meter uses fingertip whole blood as the specimen, and measures the capillary blood sugar level. .
(2) Disinfection with iodine will lead to deviations in the results, so alcohol disinfection should be used.
(3) Residual alcohol and tissue fluid exudation affect blood sugar levels. During normal disinfection, the alcohol should be fully evaporated before blood collection; do not squeeze near the blood collection point, otherwise it will easily cause tissue fluid to seep out and affect the measurement results.
(4) Insufficient blood collection.
(5) Problems with the test piece: the test piece is expired; the test piece is not stored properly; the test piece is not covered for more than 5 minutes after the cover is opened, or the test piece has not been measured for more than 5 minutes after being loaded into the machine. (The test strip will be affected by temperature, humidity, light, chemical substances, etc.)
(6) Blood collection from the lesion.
(7) Fasting blood sugar refers to the blood sugar 10 to 12 hours after the previous meal. After this time, liver glycogen is already being decomposed for the body to use.
(8) The blood glucose meter is not clean.
(9) Insufficient power.
(10) Others: blood hematocrit, triglyceride concentration, hypotension, certain drugs.
(11) Measured in hypoxic environment.
(12) Electromagnetic interference from mobile phones or other radio equipment.
9. Which patients should have their blood sugar checked?
(1) Patients using yidaosu
(2) Pregnant women
(3) Other diseases such as infection, myocardial infarction, stroke, etc. , before and after surgery
(4) Patients whose blood sugar is difficult to control at an ideal level
(5) Patients who have no symptoms during hypoglycemia
