Code inconsistency
Before the test, the code displayed by the blood glucose meter shall be checked and adjusted to be consistent with the code on the test strip packaging box. Note that each instrument has its own corresponding test strip and cannot be used with other types of instruments. The test paper code has a variety of forms. Please read the operation manual in detail when purchasing the blood glucose meter.
Test strip expired
Pay attention to check the validity period on the test strip packaging box before purchase and use. Do not use expired test strips to avoid affecting the test results. The blood glucose meter will insert the expired test paper into the instrument, and the instrument will automatically prompt that the test paper is expired.
Improper storage of test paper
Many detection errors are caused by the deterioration of the test strip. The principle of some blood glucose meters is that the enzymes (oxidase or hexokinase) on the blood glucose test strip react with the glucose in the blood and display the color, and the blood glucose meter displays the reading after distinguishing. The failure probability of the blood glucose meter itself is small, but the test strip will be affected by the temperature, humidity and chemical substances of the test environment, so the preservation of the test strip is very important. Keep away from humidity. Keep it in a dry, cool and dark place. Store it tightly after use; The test strip should be stored in the original box, not in other containers. Do not touch the test area of the test strip with your fingers. Blood glucose test paper is oxidase, and its storage time is shorter than that of other test papers. Pay special attention to storage.
Incorrect operation
Improper operation will result in test failure or inaccurate measured value. The operating procedures of various blood glucose meters are similar. Patients must read the operating instructions in detail before testing, and correctly master the operating methods of blood glucose meters. Common incorrect operations are: 1. the test strip is not fully inserted into the bottom of the test hole during the test. 2. some instruments drip blood first, and then insert the test strip into the blood glucose meter. If the test strip is inserted into the test hole after blood dripping for more than two minutes, the test results will be inaccurate. At this time, the new test strip should be used for retest. 3. when the test strip moves during the test, the test results will also be affected. Therefore, the blood glucose meter should be placed in a stable and safe place for use.
Residual alcohol
Alcohol can react with chemicals on the test strip, resulting in inaccurate blood glucose value; Moreover, when the alcohol is not completely volatilized, the pain will increase. Therefore, the blood collection operation should be carried out after the alcohol is volatilized.
Improper blood collection
1. Insufficient blood collection during the test will lead to the failure of the test or the low test results. It is necessary to replace the test strip for re determination. If the blood drop is too large, it will overflow the measurement area and affect the measurement results. The method to confirm the proper size of blood drops is to use a new test strip to drop a drop of blood in the test area, and confirm that the "blood volume confirmation dot" on the back of the test strip is completely discolored. In addition, the measurement results will also be affected due to poor circulation of the extremities, poor blood flow or excessive compression during blood collection. 2. most blood glucose meters in the market cannot collect blood from multiple parts, so they should be operated according to the instructions, and generally collect finger tip blood.
Unclean
When blood glucose is tested, it is often polluted by dust, fiber, sundries, etc. in the environment, especially when the blood accidentally pollutes the test area of the instrument, which will affect the test results. Therefore, the blood glucose meter should be regularly checked, cleaned and calibrated. Be careful to clean the test area. Do not use alcohol or other organic solvents to avoid damaging the instrument. Use a cotton swab or soft cloth dipped in clean water to wipe.
Not calibrated
The calibration of the blood glucose meter is to check whether the blood glucose meter and the test paper work normally with each other by using the simulated blood glucose solution (delivered with the instrument when purchasing). The simulated blood glucose solution contains glucose of known concentration, which can react with the test strip.
Insufficient power
After the blood glucose meter has been used for a period of time, if the words or symbols "low battery" are displayed on the display during the test, the battery should be replaced in time due to insufficient battery power.
Other factors
For example, hematocrit, triglyceride concentration in blood, hypotension, hypoxia, some drugs, etc.