Serum/plasma substance concentration (mass concentration) for a specific protein or peptide marker (e.g., related to liver function or metabolic monitoring)

Why This Test Is Done

Your healthcare provider may order this test to check for liver function issues, monitor metabolic disorders, or evaluate how your body processes certain substances. It could also be used to assess protein levels in conditions like kidney disease or certain cancers.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the draw if the test involves fasting samples. Wear comfortable clothing and plan to sit quietly for a few minutes while blood is drawn.

What the Test Results Mean

Results vary widely depending on the specific marker tested. High or low levels may signal problems like liver disease, protein disorders, or metabolic imbalances. Your doctor will interpret results in the context of your overall health and symptoms.

Common Conditions Monitored

This test may help diagnose or manage conditions such as liver dysfunction, hereditary metabolic disorders, or certain types of cancer. It can also guide treatment decisions for chronic illnesses like diabetes or kidney disease.