Pad urine collection for ear ly childhood urinary-tract infection

Macfarlane, P I; Houghton, Christine A.; Hughes, Christopher

doi:10.1016/s0140-6736(99)02270-9

Cited by 24 publications

(24 citation statements)

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“…Contaminated specimens can hide true infections [14] and we found that 30% of contaminated specimens were true infections in our study, as is reported in the literature. Contaminated specimens need to be repeated and this procedure increases the cost of urine culture [4] .…”

Section: Discussionsupporting

confidence: 88%

Evaluation of Urine Collection Methods for the Diagnosis of Urinary Tract Infection in Children

et al. 2010

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Objective: To evaluate the accuracy of urine sample collection methods among children suspected of having urinary tract infections. Subjects and Methods: Four methods for urine sample collection were evaluated in 1,067 children aged 0–16 years with suspected urinary tract infections over 2 months at Dr. Sami Ulus Children’s Hospital. Within 30 min of collection, all specimens were sent to the laboratory, refrigerated and processed according to standard hospital microbiological procedures. Urine samples were analyzed using routine culture techniques. Results: At initial sending of the urine culture, 617 (57.8%) had negative culture results, 145 (13.6%) had positive culture results, and 305 (28.6%) had evidence of bacterial contamination. Clean catch specimens showed a contamination rate of 14.3% and urethral catheterization specimens showed a similar contamination rate (14.3%). However, urethral catheterization was preferred in only a small number of cases (n = 7). Suprapubic aspiration was also used in a small number of cases (n: 11) and the contamination rate for suprapubic aspiration was 9.1% (n: 1/11). The contamination rate for sterile urine bag was 43.9%, significantly higher than the other methods (p < 0.001). Conclusion: Suprapubic aspiration showed the lowest contamination rate and sterile urine bag showed the highest contamination rate among 4 methods of urine sample collection. Contaminated specimens, needed to be repeated and this procedure increased the cost of urine culture. In conclusion, measures should be taken to reduce the contamination rate in our center. This is an area where further investigation is required.

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Section: Discussionsupporting

confidence: 88%

Evaluation of Urine Collection Methods for the Diagnosis of Urinary Tract Infection in Children

et al. 2010

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“…171 Only coagulase-negative staphylococci showed a significant association with the nappy pad collection method. Coagulase-negative staphylococci are considered skin contaminants and the close association with nappy pad reflects the close contact between nappy pads and skin.…”

Section: Summary Of Main Resultsmentioning

confidence: 96%

The Diagnosis of Urinary Tract infection in Young children (DUTY): a diagnostic prospective observational study to derive and validate a clinical algorithm for the diagnosis of urinary tract infection in children presenting to primary care with an acute illness

Hay

Birnie²,

Busby³

et al. 2016

Health Technol Assess

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BackgroundIt is not clear which young children presenting acutely unwell to primary care should be investigated for urinary tract infection (UTI) and whether or not dipstick testing should be used to inform antibiotic treatment.ObjectivesTo develop algorithms to accurately identify pre-school children in whom urine should be obtained; assess whether or not dipstick urinalysis provides additional diagnostic information; and model algorithm cost-effectiveness.DesignMulticentre, prospective diagnostic cohort study.Setting and participantsChildren < 5 years old presenting to primary care with an acute illness and/or new urinary symptoms.MethodsOne hundred and seven clinical characteristics (index tests) were recorded from the child’s past medical history, symptoms, physical examination signs and urine dipstick test. Prior to dipstick results clinician opinion of UTI likelihood (‘clinical diagnosis’) and urine sampling and treatment intentions (‘clinical judgement’) were recorded. All index tests were measured blind to the reference standard, defined as a pure or predominant uropathogen cultured at ≥ 105colony-forming units (CFU)/ml in a single research laboratory. Urine was collected by clean catch (preferred) or nappy pad. Index tests were sequentially evaluated in two groups, stratified by urine collection method: parent-reported symptoms with clinician-reported signs, and urine dipstick results. Diagnostic accuracy was quantified using area under receiver operating characteristic curve (AUROC) with 95% confidence interval (CI) and bootstrap-validated AUROC, and compared with the ‘clinician diagnosis’ AUROC. Decision-analytic models were used to identify optimal urine sampling strategy compared with ‘clinical judgement’.ResultsA total of 7163 children were recruited, of whom 50% were female and 49% were < 2 years old. Culture results were available for 5017 (70%); 2740 children provided clean-catch samples, 94% of whom were ≥ 2 years old, with 2.2% meeting the UTI definition. Among these, ‘clinical diagnosis’ correctly identified 46.6% of positive cultures, with 94.7% specificity and an AUROC of 0.77 (95% CI 0.71 to 0.83). Four symptoms, three signs and three dipstick results were independently associated with UTI with an AUROC (95% CI; bootstrap-validated AUROC) of 0.89 (0.85 to 0.95; validated 0.88) for symptoms and signs, increasing to 0.93 (0.90 to 0.97; validated 0.90) with dipstick results. Nappy pad samples were provided from the other 2277 children, of whom 82% were < 2 years old and 1.3% met the UTI definition. ‘Clinical diagnosis’ correctly identified 13.3% positive cultures, with 98.5% specificity and an AUROC of 0.63 (95% CI 0.53 to 0.72). Four symptoms and two dipstick results were independently associated with UTI, with an AUROC of 0.81 (0.72 to 0.90; validated 0.78) for symptoms, increasing to 0.87 (0.80 to 0.94; validated 0.82) with the dipstick findings. A high specificity threshold for the clean-catch model was more accurate and less costly than, and as effective as, clinical judgement. The additional diagnostic utility of dipstick testing was offset by its costs. The cost-effectiveness of the nappy pad model was not clear-cut.ConclusionsClinicians should prioritise the use of clean-catch sampling as symptoms and signs can cost-effectively improve the identification of UTI in young children where clean catch is possible. Dipstick testing can improve targeting of antibiotic treatment, but at a higher cost than waiting for a laboratory result. Future research is needed to distinguish pathogens from contaminants, assess the impact of the clean-catch algorithm on patient outcomes, and the cost-effectiveness of presumptive versus dipstick versus laboratory-guided antibiotic treatment.FundingThe National Institute for Health Research Health Technology Assessment programme.

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“…Urine collection pads (UCP) are widely used as an easy, non-invasive method of urine collection for young children still in nappies for microbiological examination of suspected urinary tract infection (UTI) [1,2,3,4,5,6]. The technique may not replace supra-pubic aspiration as the gold standard for diagnosing UTI in infants.…”

Section: Introductionmentioning

confidence: 99%

“…The technique may not replace supra-pubic aspiration as the gold standard for diagnosing UTI in infants. Our modified UCP method replaces the UCP every 30 min and reduces the problem of contamination by mixed growth flora in urine culture [7], which is important when using the technique for suspected UTI in children [4].…”

Section: Introductionmentioning

confidence: 99%

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Urine collection pads: are samples reliable for urine biochemistry and microscopy?

et al. 2004

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The aim of the study was to validate the reliability of samples obtained with urine collection pads (UCP) for selected laboratory biochemical analyses, urine cell microscopy, and bedside semi-quantitative stick urinalysis. A series of laboratory experiments was performed to test agreement between urine concentrations, or results, before and after passage through a UCP (incubated for 37 degrees C for 15 min). The following urinalyses were performed: electrolytes, calcium, phosphate, urate, osmolality, pH, protein, catecholamines, toxicology for drugs of abuse, stick urinalysis for glucose, ketones, protein, blood, leucocytes and nitrites, and microscopy for red and white cells. Close agreement was shown for all laboratory analyses except proteinuria, which was underestimated by, on average, 10% after UCP passage. However, stick urinalysis for proteinuria remains sufficiently reliable for clinical use. UCP substantially retain or destroy red and white cells, but stick urinalysis for blood and leucocyte esterase remains reliable. In conclusion, urine samples derived from UCP show good agreement across a clinically relevant range for the biochemical analyses undertaken in this study. Microscopy of UCP samples is unreliable for cellular material but semi-quantitative stick urinalysis for red and white cells is a satisfactory alternative.

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Pad urine collection for ear ly childhood urinary-tract infection

Cited by 24 publications

References 3 publications

Evaluation of Urine Collection Methods for the Diagnosis of Urinary Tract Infection in Children

Evaluation of Urine Collection Methods for the Diagnosis of Urinary Tract Infection in Children

The Diagnosis of Urinary Tract infection in Young children (DUTY): a diagnostic prospective observational study to derive and validate a clinical algorithm for the diagnosis of urinary tract infection in children presenting to primary care with an acute illness

Urine collection pads: are samples reliable for urine biochemistry and microscopy?

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