Originally dx w/ fibromyalgia. My Dr now thinks I may have Polymyalgia rheumatica.

Hi Anon,

Welcome to EmpowHER and thanks for your question. Some test that are done to diagnose polymyalgia rheumatica are.
Sed rate, or erythrocyte sedimentation rate (ESR), measures the distance red blood cells, or erythrocytes (uh-RITH-roh-sites), fall in a test tube in one hour. The distance indirectly measures the level of inflammation — the farther the red blood cells have descended, the greater the inflammatory response of your immune system. An increased rate occurs because of certain changes to red blood cell properties in response to inflammation. C-reactive protein test measures the concentration of C-reactive proteins in your blood. Production of this protein and its release into your bloodstream increase when your immune system initiates an inflammatory response. Therefore, a high concentration of C-reactive protein indicates increased inflammatory activity. Imaging tests
Ultrasound imaging, which uses sound waves to produce images of soft tissues, may reveal inflammation of tissues within the shoulder and hip joints that can support a diagnosis of polymyalgia rheumatica. These images may also help identify or rule out other causes of your symptoms.
Here's a link that can help,
https://www.empowher.com/condition/polymyalgia-rheumatica

Best of luck,
Daisy