Serum or Plasma Substance Concentration (Qualitative) for a Specific Protein or Biomarker (e.g., C-Reactive Protein, Fibrinogen, or Other Inflammatory Marker)

Why This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms like fever, fatigue, swelling, or unexplained weight changes. It could also be part of routine check-ups or monitoring for conditions like autoimmune diseases, infections, or clotting disorders.

What to Expect Before the Test

You’ll likely have a simple blood draw, usually from a vein in your arm. No special preparation is needed unless your doctor specifies otherwise. If you’re on blood thinners, tell your doctor before the test.

What the Results Mean

Results are qualitative, meaning they only tell you if the substance is present or not. If positive, it suggests your body is producing more of this protein or substance than usual, which may point to inflammation, infection, or another condition.

Common Conditions Monitored

This test can help diagnose or track conditions like infections (e.g., sepsis), inflammatory diseases (e.g., rheumatoid arthritis), or clotting disorders (e.g., deep vein thrombosis). It may also be used in screening for certain cancers or organ dysfunction.