TABLE 3

Laboratory, Imaging, and Ancillary Studies

InvestigationHigher-Risk BRUE, n (%)
PerformedAbnormalDiagnostic
Chemistry
 Sodium52 (59)5 (10)0 (0)
 Potassium54 (61)20 (37)0 (0)
 Chloride52 (59)0 (0)0 (0)
 Carbon dioxide52 (59)22 (42)0 (0)
 Glucose52 (59)10 (19)0 (0)
 Blood urea nitrogen46 (52)13 (28)0 (0)
 Creatinine46 (52)9 (20)0 (0)
 Calcium48 (55)2 (4)0 (0)
 Ammonia3 (3)2 (67)0 (0)
 Lactic acid2 (2)0 (0)0 (0)
 Blood gas57 (65)7 (12)0 (0)
 Urinalysis26 (30)6 (23)0 (0)
Metabolic screen
 Plasma amino acids quantitation4 (5)0 (0)0 (0)
 Urine organic acid screen3 (3)1 (33)0 (0)
 Quantitative plasma acylcarnitines1 (1)0 (0)0 (0)
Hematology
 White blood cell count58 (66)0 (0)0 (0)
 Hemoglobin58 (66)7 (12)0 (0)
Microbiology
 Blood culture24 (27)1 (4)1 (100)
 Urine culture20 (23)0 (0)0 (0)
 CSF culture15 (17)0 (0)0 (0)
 CSF herpes simplex virus 1 and 2 PCR12 (14)0 (0)0 (0)
 CSF enterovirus PCR4 (5)1 (25)1 (100)
Bordetella pertussis PCR2 (2)0 (0)0 (0)
 Respiratory PCR panel29 (33)2 (7)2 (100)
Imaging
 Abdominal radiograph2 (2)0 (0)0 (0)
 Abdominal ultrasound1 (1)0 (0)0 (0)
 Chest radiograph58 (66)4 (7)0 (0)
 Head ultrasound34 (39)5 (15)0 (0)
 Computed tomography brain2 (2)0 (0)0 (0)
 MRI brain4 (5)0 (0)0 (0)
Ancillary studies
 EEG41 (47)1 (2)1 (100)
 ECG17 (19)0 (0)0 (0)
 Echocardiogram11 (13)0 (0)0 (0)
 pH probe1 (1)0 (0)0 (0)