Final answer:
The correct technique for collecting a sterile urine specimen is the Midstream Clean-Catch method, wherein a midstream urine sample is collected in a sterile container after cleaning the genital area.
Step-by-step explanation:
The appropriate technique for collecting a sterile urine specimen is the Midstream Clean-Catch method. This procedure is designed to minimize the contamination of the urine sample by microorganisms that may be present on the external genitalia. It involves cleaning the genital area before urination, starting to urinate into the toilet to clear the urethra, then collecting the 'midstream' urine in a sterile container, and avoiding contact with the container's inside surface to maintain the sterility of the sample. This technique is especially important when a doctor needs a urine culture to exclude urinary infections as a potential cause of a patient's symptoms or to identify an infection secondary to another condition, such as the presence of a kidney stone.
The Random Voided method, whereby a urine sample is collected at any time without any special preparation, is generally not suitable for sterile samples as it is more prone to contamination. 24-Hour Collection is used to measure constituents of urine over a full day, such as the concentration of various electrolytes or metabolites, and does not specifically address sterility of the sample.