Comparison WELLION Calla Light vs Bionime Rightest GM 550

The measurement time of a blood glucose monitor is the duration from inserting a test strip with a blood sample into the device to receiving the result. While a shorter measurement duration theoretically enhances convenience by reducing the time spent on measurements, most modern blood glucose monitors complete this process in under 20 seconds, causing minimal inconvenience. Therefore, seeking the fastest model may not be particularly meaningful in practical terms.

Options for averaging results provided in the blood glucose monitors.

Averaging is the derivation of the average measurement result (primarily the average glucose level) over a certain period. The need for such calculations is due to the fact that with individual measurements, the indicators are affected by momentary factors, while the general trend must be determined by average numbers. In modern blood glucose monitors, averaging can be provided for different periods — from 1 day to a quarter.

Measuring range provided by the blood glucose monitor. It is indicated by the level of glucose in the blood that the device is able to detect — from the minimum to the maximum.

Most blood glucose monitors have a measurement range with a safety margin to cover relevant human values. The lower limit is typically no higher than 1.6 mmol/L, corresponding to severe hypoglycemia requiring immediate medical attention. Similarly, the upper limit in most models is around 27 mmol/L or higher, exceeding critically high values. In practical terms, a patient is more likely to fall into a coma than to surpass the blood glucose monitor's measuring range.

The minimum amount of blood required for testing. The average volume of a drop of blood released when pricked with a lancet is 1 µl; that is, if the sample volume is larger, a little more blood will need to be squeezed out.

Note that in fact, the volume can be taken with a margin — most blood glucose monitors work normally even with more blood than necessary. But too little material leads to serious inaccuracies in the readings, so this parameter should not be neglected.

The hematocrit values for which the device is designed.

Hematocrit reflects the overall red blood cell count in the blood, influencing blood viscosity and electrochemical properties. Glucometers are calibrated for specific hematocrit ranges. When these limits are surpassed, inaccuracies arise — low hematocrit levels can lead to device overestimation, while high levels can result in underestimation.

Modern blood glucose monitors typically have a hematocrit range of 30 – 50%, which effectively encompasses normal adult blood viscosity values (36 – 48%). Issues may only arise in cases of significant deviations from the norm. Some devices offer an even broader operating range.

The encoding method provided in the device.

Encoding involves configuring the device for a specific set of test strips. This is necessary because test strips of the same type in different packages may contain different reagents. To ensure precise results, the device must be adjusted to a particular batch of strips, although there are exceptions — details below.

— Codeless. Codeless blood glucose monitors are the most convenient and cost-effective option. However, they are less accurate because they don't account for the specific features of the test strips in their design, potentially introducing some error in measurement results. Despite this, the margin of error is often negligible, making them suitable for certain user categories, especially the elderly who may appreciate the simplicity of use without unnecessary settings.

— Chip. Encoding using a replaceable chip. Such a chip is supplied with each package of test strips and is installed in the metre before using the package. Changing the chip is much easier and more convenient than entering the code manually (see "Code"), this option is quite popular in modern blood glucose monitors.

— Automatic. Automatic encoding, requiring no additional user actions, involves applying a code to each test strip. The device reads this code during use, automatically adjus...ting to the specific characteristics of the strip. This option is both convenient and accurate, but the consumables for such devices can be relatively costly. — Code. Manual encoding requires users to enter the code from a new pack of test strips into the monitor before use. While cost-effective and fairly accurate, this method can be inconvenient for some users, especially the elderly. Given the availability of more advanced and user-friendly encoding technologies, devices with manual code entry are uncommon.

— Food note. The feature to annotate measurement results with information about the timing, specifically whether the analysis was conducted before or after a meal, is valuable. Devices with this capability can not only add notes to results but also gather separate statistics, such as averaging, for each result type. This method of data collection is considered optimal because glucose levels before and after a meal are distinct parameters with unique characteristics.

— Date and time. The presence of a built-in clock and calendar in the blood glucose monitor. This function is intended mainly to record the time and date of each measurement — an indispensable function for collecting statistics. However, information about the time and date can be useful for purely domestic purposes.

— Alarm clock. Classic alarm clock — a sound signal given by the device at a specified time. In glucometers, this function is intended not so much for getting up in the morning (although it can be used for this purpose), but to remind you that the time has come to take another measurement.

— Voice notification. Blood glucose monitors with voice capabilities can audibly announce measurement results and may offer other functions through the built-in speaker. This feature is particularly beneficial for indivi...duals with visual impairments who face challenges in reading the display.

— Synchronization with PC. The device's ability to sync with a computer, typically through USB connection, allows for the transfer of collected data since the last synchronization. A specialized application on the computer processes this data, offering more extensive functions than the device itself. These may include daily graph plotting, identifying minimum and maximum values, averaging for specific periods (refer to the relevant section), and facilitating data transfer to the attending physician.

— Backlight. The presence of a backlight in the display of the device allows you to read readings from it in low light conditions — up to complete darkness. The backlight can turn on automatically or by pressing a special button.

— Alert. An audible alert signals users when certain blood parameters reach critical levels, particularly designed for individuals facing health issues that impede reading the display (e.g., blurred vision). The alarm threshold is typically adjustable manually, tailored to individual cases and established in consultation with a doctor.

— Auto swicth-off. Automatic shutdown function after a certain period of inactivity. Provides battery saving and eliminates the need for the user to manually turn off the device; some models do not provide manual shutdown at all — only automatic. The auto-off time, usually, is several minutes — in such a way that the user can familiarize himself with the measurement results without fuss.

— Auto-ejecting test strip. Automatic ejection of the test strip: when the test is completed and the result is obtained, the device opens the holder, allowing the strip to fall out freely. In models without auto ejection, you usually need to press the appropriate button to remove the strip.

The test strip models that the blood glucose monitor is compatible with. This information is especially important in light of the fact that consumables must be purchased separately for continuous use (complete test strips are usually only enough for familiarization and initial testing). For normal operation of the device and reliable results, use only consumables recommended by the manufacturer.

The power source provided in the device.

— CR2032. A slim "coin" battery, measuring 2 mm in thickness and 3.2 cm in diameter, is suitable for compact devices, including the smallest ones. While its capacity is less than that of AAA cells (refer to the relevant section), it remains sufficient for modern glucometers due to their low power consumption. Notably, some devices use two of these batteries to extend their overall battery life.

— AAA. "Little" batteries, smaller than "AA" batteries but with a comparable design, are ideal for compact devices.

— Battery. Operated by an internal, often non-removable battery, eliminating the need for regular battery purchases and replacements. However, in the event of a depleted battery, replacing it with a spare is a quick solution, while recharging requires time and a power source. Consequently, this option is not widely favored.

— Mains. Operates by connecting to a 230 V household network, ensuring a constant power supply without concerns about battery depletion. However, glucometers, being primarily portable devices, are seldom equipped with mains power capabilities.