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Studies on the required analytical quality of TSH measurements in screening for congenital hypothyroidism
Insights
High analytical quality is crucial for accurate congenital hypothyroidism screening in newborns. However, lower quality may be acceptable when considering only program costs or social factors, highlighting a link between TSH test precision and cutoff values.
Area of Science:
- Clinical Chemistry
- Neonatal Screening
- Biomedical Analytics
Background:
- Congenital hypothyroidism screening relies on accurate thyroid-stimulating hormone (TSH) measurements.
- Analytical reliability directly impacts the correct classification of newborns.
Purpose of the Study:
- To evaluate the optimal analytical quality for TSH determinations in neonatal screening.
- To assess how analytical quality affects classification accuracy, costs, and social impact.
Main Methods:
- Analysis of TSH measurements from a newborn screening program.
- Evaluation of analytical quality at four levels: misclassification rates, false positive/negative trade-offs, total costs, and social costs.
- Assessment of the relationship between TSH imprecision and cutoff point selection.
Main Results:
- High analytical quality is essential for minimizing misclassifications and controlling false positives/negatives.
- Lower analytical quality may be acceptable when prioritizing only economic costs.
- Social cost considerations introduce complexity in determining acceptable analytical quality.
- A strong correlation exists between TSH assay imprecision and the chosen cutoff value.
Conclusions:
- The required analytical quality for TSH screening is context-dependent, balancing clinical accuracy with economic and social factors.
- Optimizing the cutoff point in relation to TSH measurement imprecision is critical for effective screening programs.
- Analytical performance directly influences the clinical utility and cost-effectiveness of neonatal hypothyroidism screening.
Abstract:
In the present study analytical reliability has been evaluated from the point of view of medical practice. The data were obtained from a screening program for congenital hypothyroidism in newborns using measurements of TSH. The aim of the investigation has been to evaluate the optimal analytical quality of the TSH determinations in the classification of children into two groups, with and without hypothyroidism. Evaluation of analytical quality was attempted at four different levels: (i) the numbers of misclassifications at a certain fixed value of the cutoff point, (ii) the numbers of false positives when the percentage of false negatives is fixed, (iii) the total costs of the screening program, and (iv) the social costs. When the evaluations are performed at level (i) and (ii) the results indicate a need for a high analytical quality. At level (iii) a lower analytical quality is acceptable from consideration of costs only. When social costs (iv) are considered, the acceptable analytical quality will depend on the weights given to the different factors. Finally the results point to a close relationship between the imprecision and the cutoff point chosen.