Instructing Patients on Non-Blood Specimens

Clean-Catch Midstream Urine Collection

Before providing specimen collection instructions, the phlebotomist must verify patient identity using at least two independent identifiers. Effective communication is critical because non-blood specimens are often self-collected by patients in private restrooms. The phlebotomist should confirm patient comprehension of self-collection instructions before the patient begins. Clean-catch midstream urine specimens are primarily collected to detect urinary tract infections through culture and sensitivity testing. Because these tests isolate microscopic bacteria, preventing contamination from normal skin flora is the primary goal of the collection process.

Preparation begins with hand hygiene. Patients must wash their hands thoroughly with soap and water before collecting a clean-catch urine specimen. Female patients should separate the labia and cleanse from front to back using the wipes provided for the collection. Female patients must use a separate fresh wipe for each front-to-back stroke during clean-catch preparation to avoid moving bacteria forward. Uncircumcised male patients must retract the foreskin before cleansing the glans penis for a clean-catch collection. Male patients must cleanse the tip of the penis using a circular motion starting at the urethral opening and moving outward.

The collection technique itself protects the sample from urethral flora. In a clean-catch collection, the patient begins urinating into the toilet to flush normal flora from the urethra. Then, the patient brings the sterile collection container into the urine stream without stopping the flow of urine. The patient should collect approximately 30 to 60 milliliters of midstream urine. After collecting the midstream specimen, the patient should void the remaining urine into the toilet and securely cap the container. Throughout this process, patients must avoid touching the inside of the clean-catch cup or the inside of the lid to prevent contamination.

After collection, time and temperature control are essential to preserve specimen integrity. Unless test-specific instructions state otherwise, refrigerate a urine specimen if it cannot be delivered or processed within two hours of collection. Prompt cooling prevents bacteria that may be present from multiplying outside the body before the laboratory can analyze the sample.