The Committee considered the impact on resource use of adding procalcitonin testing to standard clinical practice in intensive care unit settings. The Committee noted that most studies found reductions in resource use when procalcitonin was added to standard clinical care. However, the Committee noted that studies included in the review were done in Switzerland, France, Belgium, Brazil and China; no UK studies were included. It further noted that many of the studies were done and published several years ago, and that clinical practice for antibiotic stewardship has changed considerably in the last few years. The Committee therefore considered whether the results of these studies were generalisable to the NHS. The Committee heard from the External Assessment Group that many of the studies did not clearly report how treatment decisions were made in the control arms. The Committee heard from clinical experts that when details of the control arm were reported, they did not reflect current standard clinical practice in the UK. The Committee also heard from clinical experts that in NHS intensive care units, antibiotic stewardship is considered daily during ward rounds that include microbiologists and intensivists (doctors who specialise in the care and treatment of patients in intensive care). The Committee therefore concluded that in the intensive care unit setting, the reductions in resource use reported in the included studies when procalcitonin was added to standard clinical practice were unlikely to be realised in the NHS.