What is another name for a midstream specimen?

A midstream specimen is commonly referred to as a clean-catch specimen because it involves a specific technique designed to minimize contamination from the surrounding genital area. In urine collection, the midstream method directs the patient to begin urinating and then collect the urine after letting a small amount flow to clear the initial part, which might contain bacteria or other contaminants. This practice provides a more accurate representation of the urine in the bladder for testing.

The other options do not accurately reflect the intention or method of a midstream specimen. An expired specimen typically refers to a sample that has surpassed its optimal collection time or viability; a random specimen is collected at any time, without the same consideration for contamination; and a first-void specimen refers to the first urine produced after waking, which is often used for specific tests rather than the clean-catch method. Thus, referring to a midstream specimen as a clean-catch specimen underscores the importance of collecting a sample that is as contaminant-free as possible for accurate test results.