Author

Daniel Hofstedt DO Mercy Radiology Group Musculoskeletal and general private practice radiologist in California, focused on creating open-access radiology resources that emphasize clarity, efficiency, and practical application to support education and practice in the field.

IQR Calculator

Clinical calculator for liver stiffness measurement analysis using ultrasound elastography data. Calculates median, mean, interquartile range (IQR), and IQR/median ratio to assess measurement reliability and hepatic fibrosis staging. Implements EASL guidelines for elastography quality control with IQR/median threshold of 0.15 for reliable measurements.

Tool Categories

US Liver Calculator Cirrhosis

IQR Calculator

Clinical calculator for liver stiffness measurement analysis using ultrasound elastography data. Calculates median, mean, interquartile range (IQR), and IQR/median ratio to assess measurement reliability and hepatic fibrosis staging. Implements EASL guidelines for elastography quality control with IQR/median threshold of 0.15 for reliable measurements.

Liver Stiffness IQR Calculator - Ultrasound Elastography Analysis Tool

Clinical calculator for liver stiffness measurement analysis using ultrasound elastography data. Calculates median, mean, interquartile range (IQR), and IQR/median ratio to assess measurement reliability and hepatic fibrosis staging. Implements EASL guidelines for elastography quality control with IQR/median threshold of 0.15 for reliable measurements. Provides clinical interpretation based on established cutoff values for fibrosis staging (F0-F4) and cirrhosis detection.

Liver stiffness statistical analysis IQR/median reliability assessment Fibrosis staging interpretation Quality control validation Clinical report generation
liver stiffness, elastography, FibroScan, ultrasound elastography, hepatic fibrosis, cirrhosis, EASL guidelines, IQR median ratio, liver disease staging

Liver Stiffness Calculator

Statistical Findings

Median liver stiffness:
Mean liver stiffness:
Interquartile range:
IQR/Median ratio:

Note: IQR/median > 0.15 indicates dataset unreliability per EASL guidelines

Impression

Export Results

Clinical Reference

. EASL Clinical Practice Guidelines on non-invasive tests for evaluation of liver disease severity and prognosis - 2021 update. J Hepatol . ; 75(3):659-689. doi:10.1016/j.jhep.2021.05.025 . Epub . PMID: 34166721

This liver stiffness calculator implements the European Association for the Study of the Liver (EASL) Clinical Practice Guidelines for ultrasound elastography quality control and interpretation. The EASL guidelines established the IQR/median ratio threshold of 0.15 as the standard for reliable liver stiffness measurements.

Clinical significance: Ultrasound elastography provides non-invasive assessment of hepatic fibrosis and cirrhosis. Quality control using IQR/median ratio ensures measurement reliability before clinical interpretation. Standardized cutoff values enable fibrosis staging (F0-F4) and guide clinical decision-making for liver disease management.

Target users: Radiologists performing elastography studies, hepatologists managing liver disease, gastroenterologists screening for fibrosis, and ultrasound technologists conducting liver stiffness measurements. Essential for quality assurance in liver imaging protocols.

Clinical applications: Chronic hepatitis monitoring, cirrhosis detection, liver transplant evaluation, treatment response assessment, and screening for hepatic fibrosis in at-risk populations including viral hepatitis and fatty liver disease patients.