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Factors influencing factor VIII activity in frozen plasma.

Swärd-Nilsson, A-M ; Persson, P-O ; Johnson, Ulf LU and Lethagen, Stefan LU (2006) In Vox Sanguinis 90(1). p.33-39
Abstract
Backgrounds and Objectives Fresh frozen human plasma is an important raw material in the production of coagulation factor concentrates used in patients with haemorrhagic disorders. The aim of the study was to determine how the handling of plasma influences the recovery of coagulation factor VIII activity (FVIII:C), i.e. the influence of time between donation and freezing, of the freezing time and of the ice front velocity. We also studied a tentative eutectic point in human plasma. Materials and Methods Aliquots of plasma from 12 different donors were kept at room temperature for 2, 4 and 6 h before start of freezing. We achieved fast freezing with a freezer that blows cooled air at a high velocity on the plasma containers. Freezing times... (More)
Backgrounds and Objectives Fresh frozen human plasma is an important raw material in the production of coagulation factor concentrates used in patients with haemorrhagic disorders. The aim of the study was to determine how the handling of plasma influences the recovery of coagulation factor VIII activity (FVIII:C), i.e. the influence of time between donation and freezing, of the freezing time and of the ice front velocity. We also studied a tentative eutectic point in human plasma. Materials and Methods Aliquots of plasma from 12 different donors were kept at room temperature for 2, 4 and 6 h before start of freezing. We achieved fast freezing with a freezer that blows cooled air at a high velocity on the plasma containers. Freezing times were 0.5, 1, 4 and 24 h. Temperature was registered continuously during freezing. Plasma and NaCl solutions were frozen slowly to investigate the eutectic point. Results Storage at room temperature for 6 h caused a small but statistically significant decrease in FVIII:C. Slow freezing with programmed freezing times of 4 and 24 h caused a more pronounced drop in FVIII:C as compared to that of 30 and 60 min. We found no eutectic point in plasma or in plasma with addition of 2 % (w/v) NaCl. Conclusion For an optimal yield of FVIII, freezing should start within 4 h after plasma donation. We propose the use of the term 'ice front velocity' instead of 'freezing speed', taking into consideration that the volume and shape of plasma containers may differ. We found only a marginal loss of FVIII:C when the ice front velocity was 26 mm/h or faster, but a significant loss when it was 9 mm/h or slower. We recommend freezing times of 60 min or shorter. We were not able to demonstrate any eutectic point in human plasma. We therefore recommend that the term eutectic point should not be used as a reference temperature in guidelines on plasma handling. (Less)
Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
freezing rate, eutectic point in plasma, factor VIII activity, ice, front velocity
in
Vox Sanguinis
volume
90
issue
1
pages
33 - 39
publisher
Wiley-Blackwell
external identifiers
  • wos:000233808800004
  • scopus:33644926442
  • pmid:16359353
ISSN
1423-0410
DOI
10.1111/j.1423-0410.2005.00715.x
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Division of Hematology and Transfusion Medicine (013041100), Emergency medicine/Medicine/Surgery (013240200)
id
85601b97-2c83-4952-a01d-a5aa24c9feec (old id 148641)
date added to LUP
2016-04-01 17:01:08
date last changed
2021-08-04 03:06:22
@article{85601b97-2c83-4952-a01d-a5aa24c9feec,
  abstract     = {Backgrounds and Objectives Fresh frozen human plasma is an important raw material in the production of coagulation factor concentrates used in patients with haemorrhagic disorders. The aim of the study was to determine how the handling of plasma influences the recovery of coagulation factor VIII activity (FVIII:C), i.e. the influence of time between donation and freezing, of the freezing time and of the ice front velocity. We also studied a tentative eutectic point in human plasma. Materials and Methods Aliquots of plasma from 12 different donors were kept at room temperature for 2, 4 and 6 h before start of freezing. We achieved fast freezing with a freezer that blows cooled air at a high velocity on the plasma containers. Freezing times were 0.5, 1, 4 and 24 h. Temperature was registered continuously during freezing. Plasma and NaCl solutions were frozen slowly to investigate the eutectic point. Results Storage at room temperature for 6 h caused a small but statistically significant decrease in FVIII:C. Slow freezing with programmed freezing times of 4 and 24 h caused a more pronounced drop in FVIII:C as compared to that of 30 and 60 min. We found no eutectic point in plasma or in plasma with addition of 2 % (w/v) NaCl. Conclusion For an optimal yield of FVIII, freezing should start within 4 h after plasma donation. We propose the use of the term 'ice front velocity' instead of 'freezing speed', taking into consideration that the volume and shape of plasma containers may differ. We found only a marginal loss of FVIII:C when the ice front velocity was 26 mm/h or faster, but a significant loss when it was 9 mm/h or slower. We recommend freezing times of 60 min or shorter. We were not able to demonstrate any eutectic point in human plasma. We therefore recommend that the term eutectic point should not be used as a reference temperature in guidelines on plasma handling.},
  author       = {Swärd-Nilsson, A-M and Persson, P-O and Johnson, Ulf and Lethagen, Stefan},
  issn         = {1423-0410},
  language     = {eng},
  number       = {1},
  pages        = {33--39},
  publisher    = {Wiley-Blackwell},
  series       = {Vox Sanguinis},
  title        = {Factors influencing factor VIII activity in frozen plasma.},
  url          = {http://dx.doi.org/10.1111/j.1423-0410.2005.00715.x},
  doi          = {10.1111/j.1423-0410.2005.00715.x},
  volume       = {90},
  year         = {2006},
}