RT Journal A1 Damoiseaux RJ T1 Procalcitonin-guided antibiotic use in primary care: The ultimate proof still ahead JF Archives of Internal Medicine JO Archives of Internal Medicine YR 2009 FD April 13 VO 169 IS 7 SP 717 OP 718 DO 10.1001/archinternmed.2009.31 UL http://dx.doi.org/10.1001/archinternmed.2009.31 AB Procalcitonin (PCT) levels might be a future help in guiding antibiotic therapy for acute respiratory tract infections in primary care. Briel et al1 have shown that antibiotic prescriptions can be reduced substantially by using procalcitonin levels without harm for the patients. In primary care, however, the effects of antibiotics for acute respiratory tract infections have proven to be minimal. Any test, such as a coin flip or throwing dice, could have given the same results. This was shown already when the C-reactive protein test was used to reduce antibiotic prescriptions for acute sinusitis in primary care.2