1. Costs of unnecessary tests;Sandler;BMJ,1979
2. The appropriate use of diagnostic services: ii. The case for fewer measurements of the plasma sodium concentration: costs and gains;Morgan;Health Bull,1984
3. Electrolyte, blood urea nitrogen and glucose level screening in medical admissions, impact on patient management;Rucher;West J Med,1987
4. Utilization of laboratory services: Electrolytes and urea;Abdurrahman;Public Health,1982
5. Misuse of laboratory tests and diagnostic procedures;Griner;N Engl J Med,1982