Zahorec R. Ratio of Neutrophil to Lymphocyte Counts--Rapid and Simple Parameter of Systemic Inflammation and Stress in Critically Ill.Bratisl Lek Listy. 2001;102(1):5-14. 

Yang AP, Liu JP, Tao WQ, Li HM. The diagnostic and predictive role of NLR, d-NLR and PLR in COVID-19 patients. Int Immunopharmacol. 2020;84:106504.

Dr. Roman Zahorec

calc_output = [];
var neut = parseFloat(neut);
var lymph = parseFloat(lymph);
var ratio= neut/lymph;
ratio = ratio.toFixed(0);
var level;

if (ratio>=0 & ratio<1) {
 level = '';
} else if (ratio>=1 & ratio<=3) {
 level='Normal';
} else if (ratio>3 & ratio<=5) {
 level = '';
} else if (ratio>=6 & ratio<9) {
 level='Mild'; 
} else if (ratio>=9 & ratio<=18) {
 level='Moderate';
} else if (ratio>18) {
 level='Severe';
}

calc_output.push({
 name: 'mini',
 value: ratio,
 value_text:'',
 message:'Neutrophil-Lymphocyte Ratio'
});
calc_output.push({
 name: 'NLR',
 value: ratio,
 value_text:'',
 message: 'Neutrophil-Lymphocyte Ratio'
});
if(ratio==1 || ratio==2 || ratio==3 || ratio >= 6) {
calc_output.push({
 name: 'stress',
 value: level,
 value_text:'',
 message:'Physiologic stress level'
});
}

Neutrophil-Lymphocyte Ratio (NLR) Calculator

neut

lymph

Calculates neutrophil-lymphocyte ratio.

Neutrophil-lymphocyte ratio calculation.

Neutrophil-Lymphocyte Ratio (NLR)

Graham Walker, MD, is an emergency physician practicing in San Francisco, California. Dr. Walker attended medical school at the Stanford University School of Medicine and then trained in emergency medicine at St. Luke’s-Roosevelt Hospital Center in New York City, where he was Chief Resident. He returned to the west coast as a Medical Simulation fellow and attending in Stanford’s emergency department. More relevant, of course, is that Dr. Walker is the creator and developer of MDCalc and remains active in content and calculator development, along with our many other endeavors as President of MD Aware, LLC (MDCalc’s parent company).

Graham Walker, MD

The Neutrophil-Lymphocyte Ratio (NLR) Calculator calculates neutrophil-lymphocyte ratio. 

Basic Statistics

IV Drip Rate Calculator

Absolute Neutrophil Count

EB Medicine is the premier provider of evidence-based clinical content and CME resources for emergency medicine practitioners.

Listen to the VACO co-creators break down how to use VACO\, what it does\, and what it doesn’t.

Calc Function