Final answer:
The sulfosalicylic acid turbidity test is the confirmatory test that should be performed to verify the presence of proteins in urine after initial detection using reagent test strips.
Step-by-step explanation:
A technician asked to confirm the reagent test strip results for urine protein should perform the sulfosalicylic acid turbidity test. This test is used to detect the presence of proteins, such as albumin, in urine, which can be an indicator of proteinuria or albuminuria.
The use of urine test strips is common in urinalysis, a routine procedure often used as the first step in diagnosing potential kidney issues. Abnormal levels of proteins identified during a urinalysis can suggest a range of conditions, such as kidney infection or kidney failure.