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A new filter paper method to measure capillary blood lead level in children
K Srivuthana1, H Y Yee, K Bhambhani
1Department of Pediatrics, Children's Hospital of Michigan, Detroit, USA.
Insights
A new filter paper method accurately determines capillary blood lead levels in children. This convenient, inexpensive assay shows high agreement with reference methods, aiding in early detection of lead exposure.
Area of Science:
- Pediatric Health
- Environmental Health
- Analytical Chemistry
Background:
- Elevated blood lead levels in children pose significant health risks.
- Accurate and accessible screening methods are crucial for early detection and intervention.
- Traditional venous blood sampling can be invasive and challenging for pediatric populations.
Purpose of the Study:
- To develop and validate a novel filter paper method for quantifying capillary blood lead levels in children.
- To assess the accuracy, sensitivity, and specificity of this new method compared to a reference venous blood assay.
Main Methods:
- A paired comparison study involving 100 children (9 months to 6 years) was conducted.
- Capillary blood samples were collected on filter paper, and venous blood samples were analyzed using a reference method.
- Assay comparability was evaluated using the concordance coefficient, sensitivity, specificity, and positive predictive values at CDC-defined intervention levels.
Main Results:
- The capillary filter paper method demonstrated high agreement with the reference method (concordance coefficient = 0.96).
- High sensitivity and specificity were observed for detecting elevated blood lead levels at various intervention thresholds (e.g., 90% sensitivity and 90% specificity at ≥0.48 μmol/L).
- Positive predictive values were consistently high across all decision points.
Conclusions:
- The developed capillary filter paper method is a convenient, sensitive, accurate, and cost-effective tool for screening children for elevated blood lead levels.
- This method offers a practical alternative for routine pediatric blood lead analysis, facilitating timely public health interventions.
Objective:
To develop and evaluate a new filter paper method to determine capillary blood lead levels accurately in children.
Design:
Paired comparison of lead levels determined in capillary whole blood dried on filter paper with lead levels in venous whole blood samples determined by a reference method.
Setting:
Children's Hospital of Michigan clinics, Detroit.
Patients:
One hundred children aged 9 months to 6 years.
Interventions:
Lead concentrations determined in capillary whole blood samples dried on filter paper were compared with concentrations measured in paired venous whole blood samples by a reference method.
Main Outcome Measures:
Comparability of the two lead assay methods was assessed with the concordance coefficient. The sensitivity, specificity, and positive predictivity of the capillary filter paper method relative to the reference method were determined at three intervention decision concentrations of blood lead defined by the Centers for Disease Control and Prevention.
Results:
There was high agreement between the two assay methods, with a concordance coefficient of O.96. The capillary filter paper assay had a sensitivity of 90% and specificity of 90% for differentiating blood lead levels of 0.48 mumol/L (10 micrograms/dL) or more. Blood lead levels of 0.72 mumol/L (15 micrograms/dL) or more and 0.96 mumol/L (20 micrograms/dL) or more were identified with 98% and 94% sensitivity and 98% and 99% specificity, respectively. Positive predictivity was 93%, 98%, and 97%, respectively, at the three blood lead concentration decision points.
Conclusion:
The capillary filter paper method for blood lead analysis described herein provides a convenient, sensitive, accurate, and inexpensive method to examine children for elevated blood lead levels.