The filterability of leukocytes in undiluted blood

A. M. Cook, S. A. Evans*, J. G. Jones

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A filtrometer is described for measuring the flow of fluids through microfilters. The flow of Newtonian fluids through the filters can be predicted from the diameter, length and number of pores. There are no physical artefacts such as turbulent flow or a significant lag period before steady-state flow is achieved. The instrument has been used as a viscometer and has been used to record and analyse the flow of undiluted blood through 5 μm polycarbonate filters. The calculated viscosity of Newtonian fluids agrees well with those measured by a more conventional viscometer (Ostwald). Flow profiles of blood have been analysed to give both the numbers and the flow properties of a small population of slow leukocytes which equate numerically with the monocytes. They are subdivided into three distinct sub- populations, according to their rheological properties, and these are termed SL1, SL2 and PB. The concentration of these cells, in blood, are 0.12 ± 0.02 x 106 ml-1, 0.11 ± 0.02 x 106 ml-1, 0.09 ± 0.02 x 106 ml-1 in young females aged about 25 years. The transit time of these cells, through 5 μm pores, is 34.8 ± 1.4 s, 147.5 ± 2.5 s and > 300 s, respectively. Analysis of blood from older men (53-79 years) gives essentially the same results although the concentration of SL1 is slightly higher at 0.19 ± 0.09 x 106 ml-1.

Original languageEnglish
Pages (from-to)119-130
Number of pages12
JournalBiorheology
Volume35
Issue number2
DOIs
Publication statusPublished - 12 May 1998
Externally publishedYes

Keywords

  • Filterability
  • Filtrometer
  • Leukocytes
  • Monocytes

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