Table 1.

Tests performed per ICU discharge in pilot ICUs by time period.a

AnalytePreintervention 1/24/2014–4/23/2014, no. (95% CI)Immediate postintervention 4/25/2014–7/23/2014, no. (95% CI) (% change)Late postintervention 7/24/2014–10/25/2014, no. (95% CI) (% change)P value
iCa1.36 (1.31–1.42)0.71 (0.67–0.75) (−48%)0.63 (0.60–0.67) (−54%)<0.0001
Mg4.00 (3.91–4.09)2.44 (2.37–2.51) (−39%)2.05 (1.99–2.11) (−49%)<0.0001
NT-proBNP0.18 (0.16–0.20)0.13 (0.12–0.15) (−28%)0.14 (0.12–0.15) (−22%)0.0002
ELPN2.42 (2.35–2.49)2.44 (2.37–2.51) (+1%)2.38 (2.32–2.45) (−2%)0.51
Phos2.87 (2.80–2.95)2.00 (1.94–2.06) (−30%)1.72 (1.67–1.78) (−40%)<0.0001
AST1.10 (1.05–1.15)1.02 (0.97–1.06) (−8%)0.87 (0.83–0.91) (−21%)<0.0001
Alk Phos0.74 (0.70–0.78)0.71 (0.68–0.75) (−4%)0.60 (0.57–0.63) (−20%)<0.0001
  • a The numbers of tests are normalized as number of tests per ICU discharge to account for fluctuation in ICU census and are reported with corresponding 95% CI. The percent change for each postintervention period compared to the preintervention period is also given (a negative or positive change indicates a decrease or increase in testing, respectively). iCa, ionized calcium; Mg, serum magnesium; ELPN, electrolyte panel; Phos, phosphorus; Alk Phos, alkaline phosphatase.