Final answer:
Arthrocentesis is the medical procedure for removing synovial fluid from a joint for analysis.
Step-by-step explanation:
The procedure in which synovial fluid is removed for analysis is known as Arthrocentesis (D). Arthrocentesis is a diagnostic and therapeutic tool used by healthcare professionals to extract synovial fluid from a joint using a sterile needle for laboratory examination. This process is crucial for diagnosing joint disorders, infections, and various types of arthritis. It differs from an arthroscopy, which is a surgical procedure that involves inspecting the joint internally with a camera, or a synovectomy, which is the surgical removal of synovial tissue. A synovial biopsy is typically not referred to in the same context, as it usually involves the study of actual synovial tissue, not the fluid.