Serum/plasma mass concentration of free serum amyloid A protein

Why is this test done?

Your healthcare provider may order this test to evaluate signs of inflammation, such as fever, fatigue, or swelling, or to monitor conditions like infections, autoimmune diseases, or inflammatory disorders. Free SAA is particularly useful because it reflects recent inflammation and can be more sensitive than total SAA levels.

What does the test involve?

A blood sample is drawn from a vein, usually in your arm. The sample is then processed to separate free SAA from other proteins. The test measures the concentration of this specific protein in your blood plasma or serum.

What might affect results?

Several factors can influence free SAA levels, including infections (like pneumonia or urinary tract infections), autoimmune diseases (such as rheumatoid arthritis or lupus), chronic conditions (like heart disease or kidney problems), stress, or certain medications. Smoking, obesity, and age can also play a role.

What do results mean?

Elevated levels of free SAA often indicate an active inflammatory or infectious process. However, results alone are not diagnostic—they are typically interpreted alongside clinical findings and other tests. Your healthcare provider will consider your symptoms, medical history, and other lab results to determine the next steps.