Investigation into the effects of haematocrit and temperature on the resistivity of mammalian blood using a four-electrode probe.
Haematocrit and temperature effects on resistivity are investigated using the electrical impedance method. Measurements are made extensively for pig's blood. The experimental set-up basically involves four ring electrodes being placed around a wooden probe that is subsequently immersed into a syringe containing pig's blood. The syringe is then submerged in water maintained at a constant temperature while measurements are taken. The resistivity of blood is found to increase linearly by approximately 2.9% as the haematocrit level increases from 18% to 49% at a fixed temperature of 37 degrees C. Furthermore, the resistivity is found to decrease linearly by approximately 22% with temperature increasing from 33 degrees C to 42 degrees C for all practical levels of haematocrit.
Tjin
S C
SC
School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore. esctjin@ntu.edu.sg
Xie
T
T
Lam
Y Z
YZ
D000818:Animals; D001790:Blood Physiological Phenomena; D017097:Electric Impedance; D006400:Hematocrit; D013552:Swine; D013696:Temperature