What is true regarding a first catch urine collection?

A first catch urine collection involves collecting urine at the beginning of the urination process, which is particularly crucial for ensuring the sample reflects the patient's bladder conditions and is free from contamination from the urethra. This method increases the sensitivity of tests used for detecting certain conditions, such as urinary tract infections.

Collecting the sample after at least an hour of retention allows for a higher concentration of substances in the urine, which can provide more accurate test results. The first portion is typically more concentrated, making it more effective for testing various parameters such as microscopic evaluation or the presence of certain pathogens.

The other options do not accurately describe the first catch collection. While cleansing with a towelette is often recommended to reduce contamination, it is not a strict requirement for this procedure. A first catch urine collection does not typically entail the need for only a small amount of urine; in fact, a sufficient volume is necessary for reliable testing. Lastly, testing for blood glucose levels is commonly performed on a random urine sample and may not specifically rely on the first catch technique. Thus, the choice indicating that the sample should be collected after an hour of retention best aligns with established practices for this type of collection.