The clean catch urine sample is a specific collection method designed to obtain a specimen free from bacteria or contaminants found naturally on the skin or external genitalia. This technique is necessary for accurate diagnostic testing, particularly when a healthcare provider needs to culture the urine to identify the presence of a urinary tract infection (UTI) or other conditions. Contaminated samples can lead to inaccurate results and potentially delay correct treatment.
Gathering Necessary Supplies
Before beginning the collection process, it is important to gather all required materials to ensure a smooth and sterile procedure. The collection kit typically includes a sterile specimen cup, which must be kept free from contact on the inside and rim to avoid contamination. The kit also contains antiseptic towelettes or wipes designed for cleansing the genital area. You will also need access to soap and water for thorough handwashing before and after handling the container. If multiple samples are collected, ensure the container is clearly labeled with your name, date of birth, and the time of collection.
The Essential Cleansing Procedure
Wash your hands thoroughly with soap and water before touching any collection supplies. Carefully open the sterile specimen cup and place the lid face-up on a clean surface, ensuring you do not touch the inside of the cup or the lid. Sit on the toilet with your legs spread apart for easy access. Use one hand to separate the labia (the folds of skin on either side of the urinary opening) and hold them apart throughout the entire process.
Use the provided antiseptic wipes to cleanse the area around the urinary opening. Wipe in a single motion from front to back, which prevents the introduction of bacteria from the anal area. If multiple wipes are provided, use a fresh wipe for each pass, typically cleaning the left side, the right side, and then the center over the urethra. Discard each used wipe immediately, and continue to keep the labia separated until the urine has been collected.
Collecting the Midstream Sample
The clean catch technique relies on collecting the “midstream” of the urine flow. Keeping the labia separated, begin to urinate a small amount directly into the toilet to flush out any bacteria that may still be present in the urethra. This initial flow washes away residual flora or debris. Without stopping the flow of urine, quickly position the sterile collection cup a few inches away from the body to catch the middle portion of the stream.
Fill the cup until it is about half full, which usually equates to 60 to 90 milliliters, without allowing the cup to touch your skin. Once the desired amount is collected, remove the cup from the stream and finish urinating the remainder into the toilet.
Proper Storage and Transportation
Immediately after collection, securely screw the lid onto the specimen cup, taking care not to touch the inside of the lid or the rim. Wash your hands again with soap and water to complete the collection procedure. The sample must be delivered to the laboratory as soon as possible, ideally within 30 to 60 minutes of collection, to maintain its integrity.
If an immediate delivery is not possible, the sample must be refrigerated to slow down the growth of any bacteria. Bacterial multiplication at room temperature can alter the test results, leading to an inaccurate diagnosis. Place the tightly capped cup in a sealed plastic bag and store it in the refrigerator until it can be transported to the lab, typically within 24 hours of collection.