International Journal of Current Research and Review
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IJCRR - 14(1), January, 2022

Pages: 81-86

Date of Publication: 03-Jan-2022

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C-reactive Protein and Neutrophil Lymphocyte Ratio Levels as Predictive Biomarkers for Severity of COVID-19 Infection

Author: Prashant Bhardwaj, Manjari Kumari, Esha Singhal

Category: Healthcare

Abstract:Introduction: COVID- 19 is a highly contagious viral disease and spectrum of disease presentation range from asymptomatic to severe disease. Early diagnosis and assessment of disease severity is upmost priority to limit the morbidity, mortality and spread of disease. Aims: The aim of present study was to assess predictive values of C- reactive protein (CRP) levels and neutrophil-to-lymphocyte ratio (NLR), to disease severity to provide reference values for clinical treatment. Methodology: It was a prospective observational study in which 143 COVID-19 positive patients categorized into non-severe and severe groups. Clinical parameters, CRP values and NLR of all patients were recorded and analyzed. The receiver operating characteristic (ROC) curve was applied to determine the thresholds for both biomarkers. Result: Out of 143, total 85(59.44%) were males and 58(40.56%) female in our study. 114(79.72%) patients were non-severe and 29(20.27%) patients in severe group. Mean CRP and NLR of non severe group were 12.24(\?8.5) mg/l, 2.97(\?1.12) and in severe group 58.8(\?43.16) mg/l, 7.85(\?5.51) respectively. ROC curves analysis showed area under the curve (AUC) of 0.884 (95% CI 0.800-0.967; p value< 0.0001) for CRP and 0.817 (95% CI 0.707-0.927; p< 0.0001) for NLR. The cutoff value for CRP and NLR was 24.4mg/L and 3.6 respectively. At cutoff point, sensitivity and specificity for CRP were 82.76% and 88.6% and for NLR 75.86% and 75.44%. Conclusions: CRP and NLR are moderate accuracy diagnostic biomarkers to assess the severity of disease and of them CRP has better overall diagnostic performance than NLR.

Keywords: CRP, NLR, COVID-19 infection, Predictive biomarker

Full Text:


The current outbreak of pneumonia which is caused by coronavirus was first reported in Wuhan, China, in December 2019.1-5Later this disease has been officially named as “COVID-19” by World Health Organization (WHO).6,7  Within few months COVID-19 disease spread globally, resulting in a worldwide pandemic.8Corona virus belongs to the family Coronaviridae, subfamily Ortho-coronavirinae and Order Nidovirales. SARS-CoV had also caused the outbreak of severe acute respiratory syndrome in 2003.9  The nature of this disease is rapidly progressive, and severely ill patients can develop acute respiratory distress syndrome, sepsis, and multiple organ dysfunction syndromes in very short period of time.10

To improve the patient outcome early diagnosis, clinicopathological monitoring and appropriate treatment protocol are essential. A Chest CT scan has an important role in assessing the disease.11 Chest CT scan is an expensive diagnostic modality and not readily available all places.  So we have to consider some laboratory markers that must be inexpensive, within reach for all people and simultaneously sensitive and specific. Two biomarkers CRP and NLR both are immune-inflammatory parameters in COVID-19 infection and are associated with the progression of the infection.

In 1930s Tillett and Francis discovered CRP as an acute phase reactant. It is synthesized by liver by the action of cytokine interleukin 6 (IL- 6). Not only in bacterial infections even in other pathological processes like injuries, cardiovascular events and other inflammatory states CRP rise to very high levels. The high level of CRP is a biomarker of a pro-inflammatory state and it can be used as a prognostic marker for the underlying disease processes.12  For the early diagnosis of pneumonia C-reactive protein (CRP) levels can play important role and patients suffering with severe pneumonia have high CRP levels.13

Few studies suggest that neutrophil/lymphocyte ratio (NLR) is associated with the progression of the infection,14 or an early warning signal of severe COVID-19 infection.15 It can be considered as an independent biomarker for poor clinical outcomes and mortality in COVID-19 infection.16-20 We assessed the predictive ability of CRP levels, NLR to assess disease severity to provide a reference for clinical treatment.

Materials and Methods

This prospective observational study was started after being reviewed and approved by the institutional ethics committee (ethical committee clearance latter no. RMRI/EC/2021/54 dated on 02/04/21). We enrolled those cases that had clinical manifestations of upper respiratory tract infections like cough, shortness of breath and chest pain, which tested positive for COVID-19 by real-time reverse transcription-polymerase chain reaction (RT-PCR) using nasopharyngeal and/or oropharyngeal swabs and radiological findings of consolidation, ground-glass opacities on high-resolution computed tomography (HRCT).

After considering the inclusion and exclusion criteria we collected data of 143 patients admitted in our hospital from mid of April to May 2021 from medical records of patients. Since this was a time-bound observational study, no formal sample size calculation was done. Patients were clinically categorized into mild, moderate and severe disease according to ICMR guidelines.21 Then we sub-categorized the patients into two groups: non-severe and severe. Patients who had mild and moderate symptoms like fever, upper respiratory tract symptoms without breathlessness, SPO2>90% at room air were grouped into non-severe group and severe group had those patients who had severe symptoms like breathlessness and SPO2 <90% at room air.

The venous blood was collected at the time of admission and along with other investigations, CRP and NLR were also detected. The level of CRP was determined by the immunoturbidometery method using Liquid Microxpress Turbilyte CRP on the Benesphera C61 semiautomatic biochemical analyzer. Complete blood count was determined by five part analyzer Mindray BC-5150. NLR ratio was calculated using the simple formula of- Absolute numbers of neutrophils/ Absolute no of lymphocytes (ANC/ALC).

Statistical Analysis

SPSS (Statistical Package for Social Sciences, version 16.0.1 of IBM, USA) and Excel were adopted for data analysis. All study variables depending on the data type were summarized using appropriate measures of central tendency (mean, median) and dispersion - standard deviation (SD) or interquartile range (IQR). Categorical variables were expressed as frequencies and percentages. Receiver operation curve (ROC) was used, computation of areas under curve (AUCs; with 95% confidence intervals) and cut-off values of CRP and NLR were done. AUC >0.70 were considered to be clinically significant or relevant for good predictive score. For optimal cut-off values of CRP and NLR respective sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were calculated. p value ≤ 0.05 were considered statistically significant along with the 95% confidence interval for the test statistic computed.


A total of 143 patients with age above 18 years and confirmed diagnosis of COVID-19 were included in during the study period. Patients were divided into two comparison groups according to their clinical profile.  Among the enrolled study subjects 114(79.72%) patients were in non-severe group and, 29(20.27%) patients in severe group. There were 85(59.44%) males and 58(40.56%) females in our study. As per laboratory findings mean CRP and NLR of non-severe group was 12.24(±8.5) mg/l, 2.97 (±1.12) and 58.8(±43.16) mg/l, 7.85(±5.51) in severe group respectively. (Table 1)

ROC curves analysis revealed moderate accuracy, with an area under the curve (AUC) of 0.884 (95% CI -0.800-0.967; p value<0.0001) for CRP (Figure 1) and 0.817 (95% CI- 0.707-0.927; p<0.0001) for NLR (Figure 2). Defined by the ROC curve, the optimal threshold value was 24.4 mg/L for CRP and 3.6 for NLR (Table 2). At optimal cut-off values, sensitivity and specificity for CRP were 82.76% and 88.6% and for NLR 75.86% and 75.44% respectively (Table 3). Table3 also illustrates Positive predictive value and negative predictive value of respective biomarkers.

Comparative analysis of AUCs of CRP and NLR shows that CRP is a better diagnostic biomarker for patients with severe COVID-19 disease. (Figure 3)


COVID-19 is a pandemic and caused by the SARS-CoV-2 virus infection. The SARS-CoV-2 virus is closely related to the SARS-CoV virus and both virus belong to the β-CoV corona virus family,22 with 79.5% similarity in genetic characteristic.23The spectrum of disease varies from asymptomatic individual to severe disease and death. Clinical observations have found that some patients with mild disease progress to severe disease within a short period of time. In view of this, an opportune assessment of the severity of patient's condition by means of early monitoring of different laboratory parameters is valuable for modifying the treatment.24 The pathological changes of COVID-19 are clearly evident chiefly in respiratory system and immune system damage. 25 Acute inflammatory changes like congestion, edema, exudation and clear membrane formation appear in the lungs.26  Later development of multiple-organ dysfunction occurs which may be related to the "cytokine release storm".27

The concentration of CRP in serum fairly correlates with the severity of inflammation and is unaffected by age, gender, and physical condition.28   Therefore in clinical practice CRP is one of the common inflammatory biomarkers used for identifying infection. CRP released by injured tissues and cells and activates the complement system and facilitates the clearing of microorganisms by enhancing the phagocytic process. CRP has high specificity for identifying bacterial or viral infections and it can be used for early diagnosis of pneumonia.13,29  Patients with severe pneumonia have high CRP levels, and it is used not only for diagnosis, even for the assessment of the severity of pulmonary infection.30 Similar to our study, a study by L. Wang et al. suggests that CRP levels can reflect disease severity and may be a valuable biomarker for monitoring disease.31 Study conducted by G. Wang et al. also suggests that CRP level can be a worthy marker to predict the possibility of aggravation of nonsevere COVID-19 patients.32. Zhou et al. also observed similar findings in their study.33

Neutrophils are major component of the leukocyte population and after invasion of microorganisms in the body, it gets activated and migrates at infection site and play role in host defense and immune regulation.34 Neutrophils release a large amount of reactive oxygen species to kill the virus-infected cells and interact with different cells and produces numerous cytokines and effector molecules. One of them is Vascular endothelial growth factor (VEGF) which stimulates tumor angiogenesis, growth, and metastasis.35 It is observed that the expression of VEGF-A and VEGF-C are significantly higher in COVID-19 patients as compared to normal individuals.36   Severe reduction of neutrophils count is associated with compromised immunity and increased risk of infection.37   Considering the other side of coin, human immune response to viral infections mainly taken care by lymphocytes.38  The systemic inflammation causes depression of cellular immunity resulting into a significant decrease in CD4+ T lymphocytes and increase CD8+ suppressor T lymphocyte.39  NLR is increased in viral infections and associated with worsening of clinical profile in COVID-19 patients. Ai-Ping Yang et al found in their study that NLR may be related to the severity of infection and may also stipulate the outcome.40 Study by M. Imran et al. also suggest that NLR can be used as an early alarming signal for clinician to assess the progression of severity in COVID-19 infection.41, 42   Findings of the study,41  are very much in alignment with our study.

Our study is not free from limitations. First, stronger evidences can be reported by conducting multicentric studies with larger sample size. Secondly, we classified the patients into two groups on the basis of clinical findings. It could have been better if we should have included some other radiological parameter like CT score. Thirdly, patients with mild and moderate symptoms may deteriorate to severe clinical condition at any point of time where investigating other biochemical parameters may be necessitated. Exacerbation of nonsevere disease to severe requires meticulous follow-up of patients which was not included in our study design. Lastly, severe disease can also be associated with some co-morbid conditions which might require multivariate analysis for confirmation.


To summarize with, we observed that both laboratory parameters CRP and NLR are moderate accuracy diagnostic biomarkers to assess the severity of disease and of them CRP has better overall diagnostic performance than NLR. Elevated CRP and NLR can be used early warning indicators of deterioration of non-severe to severe COVID-19 disease irrespective radiological findings and can help clinicians to indentify severe COVID-19 cases promptly and intervene accordingly. However, furthermore, studies are needed to strengthen these facts.


We would like to thank nursing staffs of COVID ward for their support in data collection from patient’s bed head tickets. We would convey our sincere thanks to technical staffs of our central laboratory for their excellent record keeping of reports of all investigations.

Conflict of Interest- Nil

 Funding -Nil

Authors  contributions

Dr Prashant Bhardwaj- Conceptualization, Methodology, Validation, Formal analysis, Investigation, Resources, Writing – Original Draft, Writing – Review & Editing, Visualization, Project administration

Dr Manjari Kumari- Methodology, Formal analysis, Investigation, Writing– Original Draft, Writing – Review & Editing, Visualization, Project administration

Dr Esha Singhal- Conceptualization, Methodology, Investigation, Writing – Review & Editing


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Dr. Pramod Kumar Manjhi joined Editor-in-Chief since July 2021 onwards

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A Study by Sharipov R. Kh. et al. entitled "Interaction of Correction of Lipid Peroxidation Disorders with Oxibral" is awarded Best Article of Vol 13 issue 03
A Study by Tarek Elwakil et al. entitled "Led Light Photobiomodulation Effect on Wound Healing Combined with Phenytoin in Mice Model" is awarded Best Article of Vol 13 issue 02
A Study by Mohita Ray et al. entitled "Accuracy of Intra-Operative Frozen Section Consultation of Gastrointestinal Biopsy Samples in Correlation with the Final Histopathological Diagnosis" is awarded Best Article for Vol 13 issue 01
A Study by Badritdinova MN et al. entitled "Peculiarities of a Pain in Patients with Ischemic Heart Disease in the Presence of Individual Combines of the Metabolic Syndrome" is awarded Best Article for Vol 12 issue 24
A Study by Sindhu Priya E S et al. entitled "Neuroprotective activity of Pyrazolone Derivatives Against Paraquat-induced Oxidative Stress and Locomotor Impairment in Drosophila melanogaster" is awarded Best Article for Vol 12 issue 23
A Study by Habiba Suhail et al. entitled "Effect of Majoon Murmakki in Dysmenorrhoea (Usre Tams): A Standard Controlled Clinical Study" is awarded Best Article for Vol 12 issue 22
A Study by Ghaffar UB et al. entitled "Correlation between Height and Foot Length in Saudi Population in Majmaah, Saudi Arabia" is awarded Best Article for Vol 12 issue 21
A Study by Siti Sarah Binti Maidin entitled "Sleep Well: Mobile Application to Address Sleeping Problems" is awarded Best Article for Vol 12 issue 20
A Study by Avijit Singh"Comparison of Post Operative Clinical Outcomes Between “Made in India” TTK Chitra Mechanical Heart Valve Versus St Jude Mechanical Heart Valve in Valve Replacement Surgery" is awarded Best Article for Vol 12 issue 19
A Study by Sonali Banerjee and Mary Mathews N. entitled "Exploring Quality of Life and Perceived Experiences Among Couples Undergoing Fertility Treatment in Western India: A Mixed Methodology" is awarded Best Article for Vol 12 issue 18
A Study by Jabbar Desai et al. entitled "Prevalence of Obstructive Airway Disease in Patients with Ischemic Heart Disease and Hypertension" is awarded Best Article for Vol 12 issue 17
A Study by Juna Byun et al. entitled "Study on Difference in Coronavirus-19 Related Anxiety between Face-to-face and Non-face-to-face Classes among University Students in South Korea" is awarded Best Article for Vol 12 issue 16
A Study by Sudha Ramachandra & Vinay Chavan entitled "Enhanced-Hybrid-Age Layered Population Structure (E-Hybrid-ALPS): A Genetic Algorithm with Adaptive Crossover for Molecular Docking Studies of Drug Discovery Process" is awarded Best article for Vol 12 issue 15
A Study by Varsha M. Shindhe et al. entitled "A Study on Effect of Smokeless Tobacco on Pulmonary Function Tests in Class IV Workers of USM-KLE (Universiti Sains Malaysia-Karnataka Lingayat Education Society) International Medical Programme, Belagavi" is awarded Best article of Vol 12 issue 14, July 2020
A study by Amruta Choudhary et al. entitled "Family Planning Knowledge, Attitude and Practice Among Women of Reproductive Age from Rural Area of Central India" is awarded Best Article for special issue "Modern Therapeutics Applications"
A study by Raunak Das entitled "Study of Cardiovascular Dysfunctions in Interstitial Lung Diseas epatients by Correlating the Levels of Serum NT PRO BNP and Microalbuminuria (Biomarkers of Cardiovascular Dysfunction) with Echocardiographic, Bronchoscopic and HighResolution Computed Tomography Findings of These ILD Patients" is awarded Best Article of Vol 12 issue 13 
A Study by Kannamani Ramasamy et al. entitled "COVID-19 Situation at Chennai City – Forecasting for the Better Pandemic Management" is awarded best article for  Vol 12 issue 12
A Study by Muhammet Lutfi SELCUK and Fatma entitled "Distinction of Gray and White Matter for Some Histological Staining Methods in New Zealand Rabbit's Brain" is awarded best article for  Vol 12 issue 11
A Study by Anamul Haq et al. entitled "Etiology of Abnormal Uterine Bleeding in Adolescents – Emphasis Upon Polycystic Ovarian Syndrome" is awarded best article for  Vol 12 issue 10
A Study by entitled "Estimation of Reference Interval of Serum Progesterone During Three Trimesters of Normal Pregnancy in a Tertiary Care Hospital of Kolkata" is awarded best article for  Vol 12 issue 09
A Study by Ilona Gracie De Souza & Pavan Kumar G. entitled "Effect of Releasing Myofascial Chain in Patients with Patellofemoral Pain Syndrome - A Randomized Clinical Trial" is awarded best article for  Vol 12 issue 08
A Study by Virendra Atam et. al. entitled "Clinical Profile and Short - Term Mortality Predictors in Acute Stroke with Emphasis on Stress Hyperglycemia and THRIVE Score : An Observational Study" is awarded best article for  Vol 12 issue 07
A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award

A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award

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Disclaimer: International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal.


International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal


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