Blood glucose tests are in common use. There are two main type of reflectance meters and strip tests. Reflectance meters are more accurate. Elderly or colorblind people may have difficulty with colors, which may fall between two shades on the scale. Meters are more expensive, must be programmed and require some basic skill to operate.
Maintenance is important to keep meters accurate.
Whether a strip or meter is used certain frequently made mistakes may make the test invalid. The blood sample should cover enough of the pad and must be left on the pad for a sufficient length of time. The blood must be properly blotted with cotton or rayon balls. Gauze should not be used. Strips exposed to humidity, heat, or kept after the expiration date are inaccurate.