Utility of baseline D-dimer and neutrophil-to-lymphocyte ratio (NLR) in predicting the severity among COVID-19 patients in an Indian cohort during the first wave of the pandemic

Authors

  • Reshma K.
  • Sridevi H. B.
  • Nikhil Victor Dsouza
  • Sudha K.
  • Vasavi K.
  • Unnikrishnan B.
  • Prasanna Mithra
  • Sannidhi Sudharkar Kotian
  • Urmila N. Khadilkar

DOI:

https://doi.org/10.51248/.v43i4.2679

Keywords:

COVID-19, D-dimer, neutrophil-to-lymphocyte ratio (NLR), severity, prediction

Abstract

Introduction and Aim: COVID-19 outbreak was declared as pandemic by WHO Director-General on 11th March 2020 in his opening remarks at the media briefing. The global population infected by Corona virus appeared to be responding at different levels in the first wave which warranted WHO to categorise the disease as mild, moderate, and severe. Haematological, biochemical, and radiological parameters played a crucial role in critically triaging and following-up disease progression. Amongst various laboratory parameters, this work aimed to identify the most specific marker in predicting disease severity.

 

Materials and Methods: Blood samples from study population of 510 laboratory confirmed COVID-19 cases admitted in our hospital were selected. The patients who were classified as having mild, moderate, and severe disease were analysed for biochemical and haematological inflammatory markers. Results were analysed by ANOVA and post-hoc tests. ROC curves were derived to determine the cut-off values between severe and non-severe groups. Correlation between D-dimer and NLR was done by Pearson’s correlation.

 

Results: Patients with co-morbidities were likely to develop severe complications which could lead to poor outcome. From ROC curves, we determine that NLR, with highest area under curve, is the best marker of disease severity. A significant positive correlation was found between D-dimer and NLR (p=0.000) across groups. Baseline cut-off values for D-dimer and NLR based to differentiate between severe and non-severe cases were 0.5 and 4.875 respectively.

 

Conclusion: We conclude that baseline NLR is a simple and most useful tool that would assist clinicians in designing treatment strategies for a COVID-19 infected patient.

Author Biographies

Reshma K.

Department of Biochemistry, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal

Sridevi H. B.

Department of Pathology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal

Nikhil Victor Dsouza

Department of Respiratory Medicine, Medway NHS Foundation Trust, Windmill Road, Gillingham ME7 5NY, United Kingdom

Vasavi K.

Department of Biochemistry, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal

Unnikrishnan B.

Department of Community Medicine, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal

Prasanna Mithra

Department of Community Medicine, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal

Sannidhi Sudharkar Kotian

Department of Pathology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal

Urmila N. Khadilkar

Consultant Pathologist, Kasturba Medical College Hospitals, Ambedkar Circle, Mangalore

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Published

2023-08-30

How to Cite

1.
K. R, H. B. S, Victor Dsouza N, K. S, K. V, B. U, Mithra P, Sudharkar Kotian S, N. Khadilkar U. Utility of baseline D-dimer and neutrophil-to-lymphocyte ratio (NLR) in predicting the severity among COVID-19 patients in an Indian cohort during the first wave of the pandemic. Biomedicine [Internet]. 2023 Aug. 30 [cited 2023 Oct. 4];43(4):1148-53. Available from: https://biomedicineonline.org/index.php/home/article/view/2679

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