Mascc Score Calculator
Identify low-risk febrile neutropenia patients using the MASCC risk index. Enter values for instant results with step-by-step formulas.
Calculator
Adjust values & calculateMay be eligible for outpatient management with oral antibiotics and close follow-up if additional criteria are met (reliable patient, close proximity to hospital, caregiver available).
Formula
The MASCC score sums weighted criteria: Burden of illness (mild=5, moderate=3, severe=0), No hypotension (+5), No COPD (+4), Solid tumor or no prior fungal infection (+4), No dehydration (+3), Outpatient onset of fever (+3), Age < 60 (+2). Score >= 21 indicates low risk. Maximum possible score is 26.
Last reviewed: January 2026
Worked Examples
Example 1: Low-Risk Solid Tumor Patient
Example 2: High-Risk Hematologic Malignancy Patient
Background & Theory
The Mascc Score Calculator applies the following established principles and formulas. Health and medicine calculators are grounded in validated physiological measurement methods established through decades of clinical research. Body Mass Index, or BMI, is calculated by dividing weight in kilograms by height in meters squared (kg/m²), a formula originating from Adolphe Quetelet's 19th-century statistical work and later codified by the WHO into standard classifications: underweight below 18.5, normal weight 18.5 to 24.9, overweight 25 to 29.9, and obese at 30 and above. Basal Metabolic Rate quantifies the minimum energy required to sustain life at rest. The Mifflin-St Jeor equation, published in 1990 and widely regarded as the most accurate for most adults, calculates BMR as (10 × weight in kg) + (6.25 × height in cm) − (5 × age) ± sex adjustment. The older Harris-Benedict equations, revised in 1984 by Roza and Shizgal, remain in common use. Total Daily Energy Expenditure is derived by multiplying BMR by a physical activity factor ranging from 1.2 for sedentary individuals to 1.9 for extremely active ones, following the methodology validated by doubly labeled water studies. Body fat percentage can be estimated without laboratory equipment using the U.S. Navy circumference method, which uses neck, waist, and hip measurements, or via BMI-derived equations adjusted for age and sex. The Jackson-Pollock skinfold method offers higher precision with calipers. Blood pressure classification, according to the American College of Cardiology and the 2017 ACC/AHA guidelines, defines normal as below 120/80 mmHg, elevated as 120 to 129 systolic, and hypertension stage 1 as 130 to 139 systolic or 80 to 89 diastolic. Target heart rate zones for aerobic exercise are derived from maximum heart rate estimates, most commonly using the formula 220 minus age in years, with moderate-intensity training typically defined as 50 to 70 percent of maximum heart rate and vigorous intensity at 70 to 85 percent, consistent with CDC and American Heart Association guidelines. These thresholds guide safe and effective cardiovascular conditioning.
History
The history behind the Mascc Score Calculator traces back through the following developments. The history of health measurement stretches back to ancient Greece, where Hippocrates around 400 BCE laid the foundation for observational medicine by systematically recording patient symptoms, diet, and environment. His humoral theory, though scientifically superseded, established the principle that the body operates as an interconnected system subject to measurable imbalance. The transformation toward modern medicine accelerated in the 19th century. Louis Pasteur and Robert Koch developed germ theory in the 1860s and 1870s, identifying microorganisms as disease agents and enabling targeted interventions. Florence Nightingale, working during the Crimean War in the 1850s, introduced statistical analysis to nursing practice, demonstrating through data visualization that sanitation reduced mortality. Her work is foundational to evidence-based health measurement. The discovery of vitamins in the early 20th century, beginning with Casimir Funk's coinage of the term in 1912 and culminating in the isolation of vitamins A through K, created the field of nutritional science and gave rise to dietary reference intake frameworks. The World Health Organization, founded in 1948, subsequently established global standards for health metrics, disease classification through the International Classification of Diseases, and recommended daily allowances. The BMI as a clinical screening tool gained traction in the 1970s through Ancel Keys' large-scale epidemiological work, which validated Quetelet's index as a population-level obesity indicator. Through the 1980s and 1990s, the Framingham Heart Study produced landmark data linking cholesterol, blood pressure, and lifestyle factors to cardiovascular disease risk, directly shaping the numeric thresholds still used in health calculators. The evidence-based medicine movement, formalized by Gordon Guyatt and colleagues at McMaster University in the early 1990s, demanded that all health recommendations derive from systematically graded clinical evidence. The digital health era beginning in the 2000s brought these formulas to consumer devices, wearable sensors, and smartphone applications, expanding access to health self-monitoring on a global scale and enabling population-level data collection that continues to refine clinical reference ranges.
Frequently Asked Questions
Formula
MASCC Score = Burden of Illness + Hypotension + COPD + Tumor Type + Dehydration + Onset + Age (max 26)
The MASCC score sums weighted criteria: Burden of illness (mild=5, moderate=3, severe=0), No hypotension (+5), No COPD (+4), Solid tumor or no prior fungal infection (+4), No dehydration (+3), Outpatient onset of fever (+3), Age < 60 (+2). Score >= 21 indicates low risk. Maximum possible score is 26.
Worked Examples
Example 1: Low-Risk Solid Tumor Patient
Problem: A 45-year-old breast cancer patient on chemotherapy presents with fever of 38.5C and ANC of 350. She has mild symptoms, no hypotension, no COPD, no dehydration, and fever started at home.
Solution: Burden of illness (mild): +5\nNo hypotension (SBP >= 90): +5\nNo COPD: +4\nSolid tumor: +4\nNo dehydration: +3\nOutpatient onset: +3\nAge < 60: +2\nTotal MASCC Score: 26/26
Result: MASCC Score: 26 | Low Risk | Complication rate ~6% | May consider outpatient oral antibiotics
Example 2: High-Risk Hematologic Malignancy Patient
Problem: A 68-year-old AML patient presents with fever, moderate symptoms, hypotension (BP 82/50), and dehydration. Fever developed while inpatient.
Solution: Burden of illness (moderate): +3\nNo hypotension: No (0)\nNo COPD: +4\nSolid tumor: No (hematologic) (0)\nNo dehydration: No (0)\nOutpatient onset: No (inpatient) (0)\nAge < 60: No (0)\nTotal MASCC Score: 7/26
Result: MASCC Score: 7 | High Risk | Complication rate ~39% | Requires inpatient IV antibiotics and monitoring
Frequently Asked Questions
What is the MASCC score and what is it used for?
The MASCC (Multinational Association for Supportive Care in Cancer) score is a validated risk index used to identify low-risk patients with febrile neutropenia who may be suitable for outpatient management with oral antibiotics rather than requiring inpatient hospitalization with intravenous antibiotics. It was developed by Klastersky and colleagues in 2000 through a multinational prospective study of 1,139 episodes of febrile neutropenia. The score uses seven weighted clinical criteria to generate a composite score from 0 to 26 points, with a cutoff of 21 or higher defining low-risk patients. This tool has significantly changed the management paradigm for febrile neutropenia.
What does burden of illness mean in the MASCC score?
Burden of illness in the MASCC scoring system refers to the overall clinical severity at the time of presentation with febrile neutropenia, assessed by the treating physician. It is categorized into three levels: mild symptoms (5 points), which indicates the patient appears well with minimal symptoms beyond fever; moderate symptoms (3 points), indicating the patient is symptomatic but clinically stable; and severe symptoms (0 points), indicating the patient appears significantly ill with concerning clinical features such as rigors, respiratory distress, or hemodynamic instability. This subjective assessment captures clinical gestalt that laboratory values alone may not reflect and is one of the most heavily weighted components of the score.
What MASCC score indicates low risk for febrile neutropenia?
A MASCC score of 21 or higher (out of a maximum of 26) identifies patients as low risk for serious medical complications from febrile neutropenia. In the original validation study, patients with scores of 21 or above had a complication rate of approximately 6 percent and a mortality rate of less than 3 percent, compared to complication rates of 39 percent and mortality rates of 12 to 36 percent in high-risk patients scoring below 21. The positive predictive value for identifying low-risk patients was 91 percent, and the specificity was 68 percent. However, a MASCC score of 21 or higher alone is not sufficient to justify outpatient management without also considering other practical and clinical factors.
How does the MASCC score handle solid tumors versus hematologic malignancies?
The MASCC score awards 4 points for having a solid tumor (or no previous fungal infection in hematologic malignancy patients), reflecting the generally lower risk profile of febrile neutropenia in solid tumor patients compared to those with hematologic malignancies. Patients with hematologic malignancies such as leukemia or lymphoma tend to have more profound and prolonged neutropenia, higher rates of bacteremia, greater susceptibility to fungal infections, and worse outcomes from febrile episodes. This distinction is important because even with a technically low-risk MASCC score, patients with actively treated hematologic malignancies may require more cautious management due to their underlying disease biology and anticipated duration of neutropenia.
What are the limitations of the MASCC score?
The MASCC score has several important limitations. The burden of illness criterion is subjective and may vary between clinicians, reducing reproducibility. The score does not account for the expected duration of neutropenia, which is a critical determinant of infection risk. It was developed primarily in adult populations and may not be directly applicable to pediatric patients. The score does not incorporate microbiologic data, specific infection sites, or biomarkers such as procalcitonin that may improve risk stratification. Some studies have shown that the MASCC score misclassifies approximately 10 to 15 percent of patients as low risk who subsequently develop serious complications. Clinical judgment should always supplement the score.
What role does COPD play in the MASCC score?
The absence of chronic obstructive pulmonary disease (COPD) contributes 4 points to the MASCC score, making it one of the more heavily weighted criteria. COPD is included because patients with pre-existing lung disease are at significantly higher risk for respiratory complications during febrile neutropenia episodes, including bacterial pneumonia, respiratory failure, and the need for mechanical ventilation. COPD impairs mucociliary clearance and local immune defenses in the airways, creating a favorable environment for bacterial colonization and infection. Patients with COPD who develop febrile neutropenia have higher rates of documented respiratory infections and longer hospital stays compared to those without underlying lung disease.
References
Reviewed by Rahul Singh, Health & Wellness Specialist · Editorial policy