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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

Editor-in-Chief: Plebani, Mario

Ed. by Gillery, Philippe / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Payne, Deborah A. / Schlattmann, Peter / Tate, Jillian R.

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Plasma cell-free DNA as an indicator of severity of injury in burn patients

Tor W. Chiu1 / Richard Young2 / Lisa Y.S. Chan3 / Andrew Burd4 / Dennis Y.M. Lo5






Corresponding author. Tor W. Chiu, Plastic and Reconstructive Surgery, Department of Surgery, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, SAR Phone: +852-26322639, Fax: +852-26377974,

Citation Information: Clinical Chemical Laboratory Medicine. Volume 44, Issue 1, Pages 13–17, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: 10.1515/CCLM.2006.003, December 2005

Publication History

April 27, 2005
July 21, 2005
Published Online:


Background: Raised levels of plasma cell-free DNA have been detected in various patient groups, including trauma patients. We hypothesized that plasma DNA is increased in burn patients and may represent an objective indicator of burn severity and have predictive as well as prognostic significance.

Methods: This was a prospective clinical study with full ethical approval. With informed consent, blood samples were collected from 28 burn patients within 24 h of injury and from 12 control subjects. Plasma cell-free DNA was measured by real-time quantitative polymerase chain reaction (PCR) assay for the β-globin gene. Descriptive analysis, non-parametric data comparison tests (Mann-Whitney) and correlation tests (Spearman rank) were performed on the data.

Results: Samples were taken at a mean time of 5.7 h after injury from 13 patients with flame/flash burns and 15 patients with scalds. Median plasma DNA levels in the control, scald and flame/flash burn patient groups were 287, 648 and 2685 kilogenome-equivalents/L, respectively. Plasma DNA levels correlated with the length of hospital stay, but not with admission to the intensive care unit (ICU) nor the length of ICU stay. DNA levels correlated with the burn surface area (Spearman rank r=0.54, p=0.04) and the number of operations needed (Spearman rank r=0.55, p=0.03) for scalds, but not for flame/flash burns.

Conclusions: Plasma DNA is increased after burn injury and is significantly correlated with some outcome measures, including the length of hospital stay. DNA levels are higher in flame/flash patients than in scald patients; the difference may provide an objective indication of burn depth and inhalation injury.

Keywords: burns; cell-free DNA; prognostic indicator; severity

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