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Point-of-care Ultrasound for Clean-Catch Urine Collection in Young Children

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02751671
Recruitment Status : Completed
First Posted : April 26, 2016
Last Update Posted : August 3, 2017
Information provided by (Responsible Party):
Jocelyn Gravel, St. Justine's Hospital

Brief Summary:


The investigators recently evaluated a new bladder stimulation technique to obtain clean-catch urine in infants aged less than six months. In this study, the reported success rate was of 52%. Measuring the transversal bladder diameter prior to the procedure with emergency point-of-care ultrasound (ePOCUS) could likely increase success rates for this technique as it has been described for bladder scans prior to performing urethral catheterization.


The aim of this study is to evaluate if using emergency point-of-care ultrasound to measure bladder volume improves clean-catch urine collection success in patients less than 6 months of age when compared to children undergoing this technique without a prior ultrasound.


This will be a randomized controlled trial performed in a tertiary paediatric emergency department. Participants will include all infants younger than 6 months of age who need a urinary culture and/or analysis requested by the attending physician. The intervention will consist of the use of emergency point-of-care ultrasound by a trained research assistant. The primary outcome will be the rate of success of the procedure. Secondary objectives will be to evaluate time to collect urine samples and to determine which transversal bladder diameter correlates with more than a 90% success rate for the procedure. Independent variables will be sex and age. In both groups, trained research nurses will collect clean-catch urine samples using bladder stimulation techniques. The success rate of the CCU procedure in both groups will be calculated. The time required to collect urine samples will be analysed. In group 1, the investigators will determine the transversal bladder diameter corresponding to a success rate for the procedure of > 80%. It is estimated that, in the worse-case scenario, the evaluation of 200 participants will provide a 95% confidence interval smaller than 10% for proportions. In addition, 20 participants with a successful CCU sample would allow to evaluate 2 risk factors using univariate and multivariate analysis.

Expected results:

This study will demonstrate that use of emergency point-of-care ultrasound increases success rates of stimulated clean-catch manoeuvres and may avoid invasive urethral catheterizations in young children.

Condition or disease Intervention/treatment Phase
Urinalysis Children Procedure: POCUS Procedure: Standard Not Applicable

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 201 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Are Stimulated Clean-Catch Urine Collection Techniques More Successful When Combined With Prior Emergency Point-of-care Ultrasound in Paediatric Patients?
Actual Study Start Date : August 2016
Actual Primary Completion Date : June 2017
Actual Study Completion Date : June 2017

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: POCUS before clean catch sampling
The intervention of interest will be the use of emergency point-of-care ultrasound performed by a research assistant to evaluate bladder fullness before clean-catch stimulation manoeuvre. More specifically, following randomisation, children in the experimental group will have ePOCUS to measure the transversal bladder diameter. If the transversal bladder diameter is > 2 cm, the CCU procedure will be started without a prior feeding period. If the diameter is < 2 cm, the CCU will be postponed for a 20 minute feeding period and a new ePOCUS will be done. After the second ePOCUS, the CCU will be done if the transversal bladder diameter reaches > 2cm. If not, the child will have another 20 minute feeding period and a third ePOCUS prior to proceeding to the CCU regardless the bladder diameter.
Procedure: POCUS
The use of Point-of-care ultrasound before urine sample procedure

Experimental: Standard clean catch sampling
Patients allocated to this arm will have a 20 minute feeding period either being breastfed or provided with formula intake appropriate to the infant's age and weight. If possible, the genital areas of the infant will be cleaned with warm water and soap and dried with sterile gauze prior to the feeding. The parents will let the diaper opened and will be will be ready to collect urine if the child voids during the feeding period. After the feeding, the stimulated clean-catch procedure will be performed without prior ultrasound
Procedure: Standard
Urine sampling procedure without prior ultrasound

Primary Outcome Measures :
  1. Successful clean-catch manoeuver [ Time Frame: 5 minutes ]
    The rate of successful clean-catch urine sample collection. Success is defined by the collection of a sample of urine of at least 2 mL, obtained within 300 seconds of bladder stimulation manoeuvers or obtained while disinfecting prior to the manoeuvre.

Secondary Outcome Measures :
  1. Delay for collection [ Time Frame: 1 hour ]
    Time to collect urine sample from randomisation to sample collection

  2. delay for procedure [ Time Frame: 1 hour ]
    Time to collect urine sample from beginning of stimulation to sample collection

  3. Nurse time [ Time Frame: 2 hours ]
    Time that nurses have to spend with the patients

Information from the National Library of Medicine

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Ages Eligible for Study:   up to 5 Months   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Children aged less than 6 months
  • Urine sample ordered by the treating physician
  • Presence of a research assistant

Exclusion Criteria:

  • Any medical condition where obtaining a midstream urine sample is impossible (e.g. urostomy, anuria for 24h)
  • Any serious illness or unstable infant (e.g. sepsis)
  • Any medical situation where the infant cannot be fed (e.g NPO order, GCS<15)
  • Inability to obtain parental informed consent (language barrier, absence, etc.)

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02751671

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Canada, Quebec
CHU Sainte-Justine
Montreal, Quebec, Canada, H3T1C5
Sponsors and Collaborators
St. Justine's Hospital

Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Jocelyn Gravel, MD, St. Justine's Hospital Identifier: NCT02751671     History of Changes
Other Study ID Numbers: POCUS CCU
First Posted: April 26, 2016    Key Record Dates
Last Update Posted: August 3, 2017
Last Verified: April 2017
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No