F. Hoffmann-La Roche Ag

Avl Medical Instruments Ag

Ewald J&ouml;bstl

Werner E Ziegler

Herbert Kroneis

James Kenneth Tusa

Manfred Strohmeier

Charles L Laughinghouse

Daniel Ben-David

An optical measurement system for determining transmitted radiation and scattered radiation in a liquid sample contained in a capillary tube and subject to measurement radiation, is provided with a first detector picking up transmitted radiation, which is positioned close to or on the axis of the beam of measurement radiation. There is further provided a second detector for picking up scattered radiation, which is positioned at a distance from the first detector in the direction of the capillary axis. The two detectors lie on different sides of a plane which contains the capillary axis and is normal to the axis of the measurement radiation.

Optical measurement system for determination of transmitted and scattered radiation

A control or calibration standard for use with instruments for the optical measurement of the hemoglobin content in blood samples, features scattering particles or beads dispersed in aqueous electrolyte solution. To prevent sedimentation of the beads during storage, they have a mean diameter of <0.6 &mgr;m, preferably about 0.3 &mgr;m, and a volume concentration of <1%, preferably <0.3%. To prevent long term agglomeration, a non-ionic surfactant with an added antioxidant can be included in the formulation.

Control or calibration standard for use with instruments for optical measurement of hemoglobin concentration in blood samples

Growing community of inventors

Graz, Austria

Ewald Jöbstl

Growing community of inventors

Graz, Austria

Ewald J&ouml;bstl

Ewald Jöbstl