A clean catch urine sample is a method for collecting urine that minimizes contamination from external sources. This common, non-invasive procedure provides a pure specimen for diagnostic testing. It ensures that any bacteria or substances found truly originate from the urinary system, not the skin or genital area.
Purpose of a Clean Catch
The clean catch method aims to obtain a urine sample free from contaminants like bacteria, skin cells, or debris from the genital area. Contamination can lead to inaccurate test results, potentially showing bacteria not actually causing an infection, which may result in misdiagnosis or unnecessary treatment.
Collecting a clean catch sample is important when testing for urinary tract infections (UTIs) or other kidney and bladder conditions. An uncontaminated sample allows healthcare providers to accurately identify the microorganisms causing an infection and determine the most effective treatment.
Performing a Clean Catch
Collecting a clean catch urine sample involves several steps. First, wash and dry your hands thoroughly. Prepare the sterile collection cup by removing its lid and placing it upside down on a clean surface, taking care not to touch the inside. Many kits include antiseptic wipes for cleansing; if not, soapy water can be used.
For females, separate the labia with one hand. Use the provided cleansing wipe to clean the area around the urinary opening, wiping from front to back. Maintain separation of the labia throughout the collection process.
For males, if uncircumcised, retract the foreskin. Use the cleansing wipe to clean the head of the penis, including the urinary opening. Some guidelines suggest using multiple wipes to thoroughly cleanse the area. It is important to keep the foreskin retracted during collection.
After cleansing, begin to urinate a small amount into the toilet; this initial stream helps flush away any remaining bacteria from the urethra. Without stopping the flow, position the sterile cup into the urine stream and collect a “midstream” sample until the cup is about half full. Avoid touching the inside of the cup or the rim to the body. Once enough urine is collected, remove the cup and finish urinating into the toilet. Securely screw the lid back onto the cup without touching the inside of the lid or the cup’s rim.
Important Considerations for a Clean Catch
If you find it difficult to produce a sample, staying hydrated by drinking fluids can help stimulate urination. For children, obtaining a clean catch sample can be challenging, and caregivers may need to encourage fluid intake and be patient, as the process can take time. For infants, specialized collection bags with adhesive strips might be used, though a clean catch is still the preferred method when possible.
Proper handling and timely delivery of the sample are important after collection. Ensure the container is labeled with your full name, date of birth, and the date and time of collection. The sample should be transported to the laboratory as soon as possible, ideally within 30 minutes to two hours. If there will be a delay, the sample must be refrigerated at 2-8°C (35-46°F) to preserve its integrity, and it is typically stable for up to 24 hours under refrigeration. Clean catch samples are commonly requested during routine check-ups, for suspected urinary tract infections, or to investigate other urinary system issues.