Barbiturates, fluorescence quenching, and the "flash-light" phenomenon.

1. Dussault, J. H., Coulombe, P., Laberge, C., et al., Preliminary report on a mass screening program for neonatal hypothyroidism. J. Pediatr. 86, 670 (1975). 2. Larsen, P. R., and Broskin, K., Throxine (T-4) immunoassay using filter paper blood samples for screening neonates for hypothyroidism. Pediatr. Res. 9, 604 (1975). 3. Walfish, P. G., Screening for neonatal hypothyroidism using a dried capillary blood method. In Perinatal Thyroid Physiology and Disease. D. A. Fisher and G. N. Burrow, Eds., Raven Press, New York, N.Y., 1975, pp 234-247. 4. Fisher, D. A., Advances in the laboratory diagnoses ofthyroid disease. J. Pediatr. 82, 1 (1973). 5. Erenberg, A., Phelps, D. L., Lam, R., and Fisher, D. A., Total and free thyroid hormone concentrations in the neonatal period. Pediatrics 53, 211 (1974).