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. 1993 Sep;31(5):445-8.
doi: 10.1007/BF02441978.

Implications of the dielectrical behaviour of human blood for continuous online measurement of haematocrit

P M de Vries  1 , J W Langendijk, P M Kouw, V Visser, H Schneider
Affiliations

Implications of the dielectrical behaviour of human blood for continuous online measurement of haematocrit

P M de Vries et al. Med Biol Eng Comput. 1993 Sep.

Abstract

A study was designed to explore the possibility of detecting the haematocrit of blood by means of admittance measurements. The admittance and phase angle of blood kept in a measuring cell were determined at various frequencies between 60 kHz and 24 MHz. A reliable and accurate estimation of haematocrit was obtained in two ways. First, low-frequency admittance, high-frequency admittance and a factor x, which was the conductive percentage of cell content, were used. Secondly, the maximum phase angle was used. Both methods can be applied to obtain continuous on-line information about haematocrit for blood volume control during haemodialysis.

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