What type of sample is commonly used to perform a urinalysis?

A urine sample is the correct choice for urinalysis because this test is specifically designed to analyze the chemical and physical properties of urine. Urinalysis can provide critical information about a person's health, including kidney function, hydration status, and the presence of various substances that may indicate infections, diabetes, or other health issues.

Blood samples, while useful for many tests, do not give the same specific information as urine regarding the urinary system or metabolic byproducts filtered by the kidneys. Similarly, saliva samples are often used for different types of hormonal or drug testing and do not contain the same indicators as urine for conditions typically assessed through urinalysis. Tissue biopsies provide information about the structure and presence of disease in tissues, which is not relevant for the analysis that a urinalysis requires. Therefore, urine samples are the standard and most relevant for this specific diagnostic test.