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Evaluation of a nation-wide neonatal metabolic screening programme in Sweden 1965-1979
Insights
Sweden
Area of Science:
- Medical Genetics
- Neonatal Screening
- Public Health
Background:
- Neonatal screening programs are crucial for early detection of metabolic disorders.
- Sweden initiated widespread neonatal screening in 1965.
- Several inborn errors of metabolism were screened over time.
Purpose of the Study:
- To evaluate the effectiveness and incidence of neonatal screening for specific metabolic disorders in Sweden.
- To determine the optimal screening strategy based on disease incidence and detection rates.
Main Methods:
- Analysis of neonatal screening data from 1,326,000 infants in Sweden (1965-1979).
- Screening included phenylketonuria, galactosaemia, hereditary tyrosinaemia, histidinaemia, and homocystinuria.
- Incidence and detection rates were calculated for each screened disorder.
Main Results:
- Phenylketonuria incidence: 1/30,850; Galactosaemia incidence: 1/81,100, with no false negatives.
- Hereditary tyrosinaemia had a low detection rate (1/6 identified) and incidence of 1/106,710.
- Histidinaemia detected in 2 cases (1/36,840), with normal development without treatment; no homocystinuria cases found.
Conclusions:
- Screening for phenylketonuria and galactosaemia proved highly effective with no false negatives.
- The combined screening program for phenylketonuria and galactosaemia is considered optimal.
- Screening strategies need careful consideration of disease incidence and diagnostic accuracy.
Abstract:
In Sweden, neonatal screening for phenylketonuria was started in 1965 and a total of 1 326 000 infants were studied up to 1979. During various periods of time, screening was also carried out for galactosaemia, hereditary tyrosinaemia, histidinaemia, and homocystinuria. In screening for phenylketonuria and galactosaemia no false-negative results were obtained and the incidences were 1/30 850 and 1/81 100, respectively. In screening for hereditary tyrosinaemia only 1 out of 6 patients was identified by screening and the incidence was 1/106 710. Two cases of histidinaemia were detected, which corresponds to an incidence of 1/36 840. Both children developed normally without any treatment. No child with homocystinuria was detected in the screened population of more than 300 000 newborn infants. A screening programme involving phenylketonuria and galactosaemia was considered to be optimal among the tested disorders.