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Meta-Analysis
. 2015 Jan 20;1(1):CD009185.
doi: 10.1002/14651858.CD009185.pub2.

Procalcitonin, C-reactive protein, and erythrocyte sedimentation rate for the diagnosis of acute pyelonephritis in children

Nader Shaikh  1 , Jessica L Borrell, Josh Evron, Mariska M G Leeflang
Affiliations
Meta-Analysis

Procalcitonin, C-reactive protein, and erythrocyte sedimentation rate for the diagnosis of acute pyelonephritis in children

Nader Shaikh et al. Cochrane Database Syst Rev. .

Update in

Abstract

Background: In children with urinary tract infection (UTI), only those with pyelonephritis (and not cystitis) are at risk for developing long-term renal sequelae. If non-invasive biomarkers could accurately differentiate children with cystitis from children with pyelonephritis, treatment and follow-up could potentially be individualized.

Objectives: The objectives of this review were to 1) determine whether procalcitonin, C-reactive protein (CRP), erythrocyte sedimentation rate (ESR) can replace the acute DMSA scan in the diagnostic evaluation of children with UTI; 2) assess the influence of patient and study characteristics on the diagnostic accuracy of these tests, and 3) compare the performance of the three tests to each other.

Search methods: We searched MEDLINE, EMBASE, DARE, Web of Science, and BIOSIS Previews for this review. The reference lists of all included articles and relevant systematic reviews were searched to identify additional studies not found through the electronic search.

Selection criteria: We only considered published studies that evaluated the results of an index test (procalcitonin, CRP, ESR) against the results of an acute-phase DMSA scan (conducted within 30 days of the UTI) in children aged 0 to 18 years with a culture-confirmed episode of UTI. The following cutoff values were used for the primary analysis: 0.5 ng/mL for procalcitonin, 20 mg/L for CRP and 30 mm/h for ESR.

Data collection and analysis: Two authors independently applied the selection criteria to all citations and independently abstracted data. We used the bivariate model to calculate pooled random-effects pooled sensitivity and specificity values.

Main results: A total of 24 studies met our inclusion criteria. Seventeen studies provided data for the primary analysis: six studies (434 children) included data on procalcitonin, 13 studies (1638 children) included data on CRP, and six studies (1737 children) included data on ESR (some studies had data on more than one test). The summary sensitivity estimates (95% CI) for the procalcitonin, CRP, ESR tests at the aforementioned cutoffs were 0.86 (0.72 to 0.93), 0.94 (0.85 to 0.97), and 0.87 (0.77 to 0.93), respectively. The summary specificity values for procalcitonin, CRP, and ESR tests at these cutoffs were 0.74 (0.55 to 0.87), 0.39 (0.23 to 0.58), and 0.48 (0.33 to 0.64), respectively.

Authors' conclusions: The ESR test does not appear to be sufficiently accurate to be helpful in differentiating children with cystitis from children with pyelonephritis. A low CRP value (< 20 mg/L) appears to be somewhat useful in ruling out pyelonephritis (decreasing the probability of pyelonephritis to < 20%), but unexplained heterogeneity in the data prevents us from making recommendations at this time. The procalcitonin test seems better suited for ruling in pyelonephritis, but the limited number of studies and the marked heterogeneity between studies prevents us from reaching definitive conclusions. Thus, at present, we do not find any compelling evidence to recommend the routine use of any of these tests in clinical practice.

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Conflict of interest statement

None known

Figures

1
1
Study flow diagram
 CRP ‐ C‐reactive protein; DMSA ‐ 99Tc‐dimercaptosuccinic acid; ESR ‐ erythrocyte sedimentation rate; PCT ‐ procalcitonin; SPECT ‐ single‐photon emission computed tomography
2
2
Methodological quality summary: review authors' judgements about each methodological quality item for each included study
3
3
Summary ROC plot of procalcitonin > 0.5 ng/mL (solid point = pooled accuracy; dotted oval = 95% confidence region)
4
4
Procalcitonin at cutoffs other than 0.5 ng/mL
5
5
Summary ROC plot of C‐reactive protein > 20 mg/L (solid point = pooled accuracy; dotted oval = 95% confidence region)
6
6
C‐reactive protein at cutoffs other than 20 mg/L
7
7
Summary ROC plot of erythrocyte sedimentation rate ≥ 30 mm/h (solid point = pooled accuracy; dotted oval = 95% confidence region)
8
8
ESR at cutoffs other than 30 mm/h
9
9
Direct comparison of C‐reactive protein > 20 mg/L and procalcitonin > 0.5 ng/mL
1
1. Test
PCT > 0.5 ng/mL.
2
2. Test
CRP > 20 mg/L.
3
3. Test
ESR ≥ 30 mm/h.
4
4. Test
PCT: cutoff other than 0.5 ng/mL.
5
5. Test
CRP: cutoff other than 20 mg/L.
6
6. Test
ESR: cutoff other than 30 mm/h.
See this image and copyright information in PMC

References

References to studies included in this review

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