Fang et al reported a nomogram for predicting acute pyelonephritis in an infant or toddler with an acute urinary tract infection (UTI). The authors are from Kaohsiung Veterans General Hospital, National Yang Ming Chiao Tung University, and Kaohsiung School of Medicine in Taiwan.
Patient selection: pediatric patient with acute urinary tract infection with age 1 to 21 months
Parameters:
(1) ultrasonography of the kidney
(2) serum CRP in mg/dL
(3) serum procalcitonin in pg/mL (ng/L)
(4) fever peak in °C
Parameter
Finding
Points
ultrasonography
normal
0
abnormal
10
serum CRP
< 2.86 mg/dL
0
>= 2.86 mg/dL
8.6
serum procalcitonin
< 0.52 pg/mL
0
>= 0.52 pg/mL
6.7
fever peak
<= 39°C
0
> 39°C
9.8
total score =
= SUM(points for all of the parameter)
Interpretation:
• minimum score: 0
• maximum score: 35.1
value of X =
= (0.1829 * (score)) - 2.991
probability of acute pyelonephritis =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.89.
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