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Problems with serum IgM as a screening test for congenital infection
B E Mahon1, E G Yamada, T B Newman
1Pediatric Residency Program, School of Medicine, University of California, San Francisco.
Clinical Pediatrics
|March 1, 1994
Summary
Total serum IgM is not a useful screening test for congenital infections in infants. This study found a low yield and poor follow-up, indicating it is not effective for diagnosing these infections.
Area of Science:
- Neonatal Medicine
- Infectious Diseases
- Clinical Pathology
Background:
- Congenital infections pose significant risks to newborns.
- Screening tests are crucial for early detection and intervention.
- The utility of total serum IgM as a universal screening tool for congenital infections requires evaluation.
Purpose of the Study:
- To assess the effectiveness of total serum IgM levels in screening asymptomatic or mildly symptomatic infants for congenital infections.
- To evaluate the diagnostic yield and follow-up adequacy of serum IgM testing in this population.
Main Methods:
- Retrospective medical record review of 168 infants.
- Analysis of indications for serum IgM testing.
- Examination of test yield and follow-up of abnormal results.
Main Results:
- Only one congenital infection (cytomegalovirus) was detected via screening, which was not specifically suspected beforehand.
- Inappropriate screening was common, often performed when specific indications were already present.
- Adequate follow-up for elevated serum IgM levels occurred in only 30% of cases within the institution.
Conclusions:
- Total serum IgM is not a sensitive or useful screening test for congenital infections in infants.
- Low diagnostic yield and inadequate follow-up limit its clinical value.
- Current screening practices for congenital infections require re-evaluation.