Related Experiment Video
Updated: Aug 17, 2026
Measurement of Tissue Non-Heme Iron Content using a Bathophenanthroline-Based Colorimetric Assay
Published on: January 31, 2022
Assessment of iron stores in children with transfusion siderosis by biomagnetic liver susceptometry
R Fischer1, C D Tiemann, R Engelhardt
1Abteilung Medizinische Biochemie, University Hospital Eppendorf, Hamburg, Germany. fischer@uke.uni-hamburg.de
Insights
Superconducting Quantum Interference Device (SQUID) biomagnetic liver susceptometry accurately measures iron stores in children with thalassemia. This noninvasive method helps predict iron load and assess chelation therapy effectiveness.
Area of Science:
- Biophysics
- Pediatric Hematology
- Medical Imaging
Background:
- Thalassemia and other anemias cause dangerous iron overload.
- Accurate monitoring of iron stores is crucial for effective treatment.
- Current methods for assessing iron overload have limitations.
Purpose of the Study:
- To evaluate the noninvasive Superconducting Quantum Interference Device (SQUID) biomagnetic liver susceptometry for assessing liver iron concentration in pediatric patients.
- To determine the limitations and applicability of SQUID in thalassemic children.
- To correlate SQUID measurements with established clinical data.
Main Methods:
- Studied 23 pediatric patients with beta-thalassemia major and 16 healthy children.
- Measured liver iron concentrations using SQUID biomagnetic liver susceptometry.
- Estimated liver and spleen iron stores using organ volumes from sonography.
- Analyzed data using a two-compartment model incorporating treatment information.
Main Results:
- SQUID accurately measured liver iron concentrations, ranging from 600 to 11,000 microg/g in thalassemic patients.
- No significant nonliver contributions to SQUID signals were observed in small patients.
- Thalassemic livers were enlarged (18% per 1,000 microg/g), correlating with iron levels.
- Serum ferritin correlated with iron stores but had large error intervals.
- The two-compartment model provided insights into iron elimination and chelation efficacy.
Conclusions:
- Noninvasive SQUID biomagnetic liver susceptometry is applicable and reliable for quantifying liver iron in thalassemic children.
- SQUID measurements offer a more precise assessment of iron overload than serum ferritin alone.
- This technique aids in forecasting iron load and optimizing transfusion and chelation therapy regimens.
Abstract:
To investigate the applicability of noninvasive Superconducting Quantum Interference Device (SQUID) biomagnetic liver susceptometry and its limitations in thalassemic children, 23 patients with beta-thalassemia major and other iron loading anemias (age: 4-16 years) and 16 age-related normal children were studied. Liver iron concentrations ranged from 600 to 11,000 microg/g(liver) for thalassemic patients and from 60 to 340 microg/g(liver) for normal patients. Measuring the respective organ volumes by sonography, liver and spleen iron stores, accounting for 80% of total body iron stores, were estimated. Nonliver contributions from the lung or intestine to the measured SQUID signals in the small-sized patients were not observed. Moreover, livers in thalassemia were found to be enlarged by 18% per 1,000 microg/g (r = 0.75, P < 10(-3)). Serum ferritin values correlate significantly with iron stores (r = 0.64, P < 10(-3)), but predict iron stores only within large error intervals of 4,000 microg/g(liver). Analyzing the experimental data from biomagnetometry and from related transfusion and chelation treatment data within the framework of a two-compartment model, we were able to derive additional information on total body iron elimination and chelation therapy efficacy. The exponential decline of iron stores allows forecast of steady-state conditions of the final iron load for a particular transfusion and chelation therapy regimen.
