306 results about "Hematocrit" patented technology

A biosensor that utilizes a mediator, i.e., an isomer of phenanthroline quinone, 1,10-phenanthroline-5,6-dione, and a metal ion, such as manganese, with an enzyme dependent upon NAD(P)+, such as, for example, glucose dehydrogenase, for improving the hematocrit bias and oxygen bias of biosensors. The electrodes of the biosensors employing this mediator and a metal ion provide an accurate clinical response over a hematocrit range that ranges from about 20% to about 70% and over an oxygen tension range that ranges from about 1 kPa to about 20 kPa.

Methods and devices for determining the concentration of an analyte in a physiological sample are provided. In the subject methods, the physiological sample is introduced into an electrochemical cell having a working and reference electrode. A first electric potential is applied to the cell and the resultant cell current over a period of time is measured to determine a first time-current transient. A second electric potential of opposite polarity is then applied and a second a time-current transient is determined. The preliminary concentration of the analyte is then calculated from the first and / or second time-current transient. This preliminary analyte concentration less a background value is then multiplied by a hematocrit correction factor to obtain the analyte concentration in the sample, where the hematocrit correction factor is a function of the preliminary analyte concentration and the variable γ of the electrochemical cell. The subject methods and devices are suited for use in the determination of a wide variety of analytes in a wide variety of samples, and are particularly suited for the determination of analytes in whole blood or derivatives thereof, where an analyte of particular interest is glucose.

Disclosed are methods for conducting assays of samples, such as whole blood, that may contain cells or other particulate matter. Also disclosed are systems, devices, equipment, kits and reagents for use in such methods. One advantage of certain disclosed methods and systems is the ability to rapidly measure the concentration of an analyte of interest in blood plasma from a whole blood sample without blood separation and hematocrit correction.

The present invention provides reagent compositions, and analyte measuring devices and methods that utilize the reagent compositions.

A voltage is applied across a counter electrode and a working electrode while an oxidant of a redox substance is in contact with the counter electrode and is not substantially in contact with the working electrode, and thereby metal that readily undergoes electrolytic oxidation forming at least part of a surface of the working electrode is oxidized while the oxidant in contact with the working electrode is reduced, such that a current produced upon the oxidation and the reduction is measured. According to the above constitution, while lowering the voltage applied across the working electrode and the counter electrode, a hematocrit value of a blood sample can be measured stably with satisfactory detection sensitivity. This measurement can be carried out, for example, with a sensor chip comprising a working electrode 11, a counter electrode 12, and a blood sample holder 14 in communication with a blood sample inlet 16, wherein a portion 31 of the working electrode 11 is disposed closer to the blood sample inlet 16 than a portion 32 of the counter electrode is, a surface of the portion 31 includes the metal that readily undergoes electrolytic oxidation, and a reagent 13 containing the oxidant is disposed in contact with the portion 32.

An ultrasonic field-portable system for accurately measuring hematocrit (HCT) and hemoglobin concentration (HGB) in small food samples. The system includes an analyzer (10) that allows extremely accurate measurements of blood hematocrit from only one or two drops of +>>d collected in a disposable sampling device (12) that is then inserted into the analyzer (10). The system is compact enough to package into a point of care device, making it a point of care device with accuracy comparable to larger CBC lab equipment.