Final answer:
The next test that should be ordered if significant proteinuria is noted on a UA is a quantitative protein measurement called a 24-hour urine protein test. Further tests may also be ordered to evaluate the underlying cause of proteinuria.
Step-by-step explanation:
If significant proteinuria is noted on a urine analysis (UA), the next test that should be ordered is a quantitative protein measurement called a 24-hour urine protein test. This test measures the amount of protein excreted in the urine over a 24-hour period. It helps to determine the severity of proteinuria and assess kidney function.
In addition to the quantitative protein measurement, further tests may be ordered to evaluate the underlying cause of the proteinuria, such as a renal function panel to assess kidney function, a serum protein electrophoresis (SPEP) to identify abnormal protein patterns, and a kidney biopsy to examine the kidney tissue.