“…The administratative problems are forbidding; but it is remarkable how readily the infants themselves co-operate away from an atmosphere of parental apprehension of fingerpricks, in sharp contrast to those children attending hospital outpatients with their parents. A simple screening method undertaken at the nurseries, such as the copper sulphate densitometric test used by blood donor attendants and also found to be a manageable procedure for children (Costeff, 1965), might well be a practical proposition to eliminate the 95% or so who do not require either further examination or iron therapy.…”