: Fifth Most Predominant Hemoglobin by Electrophoresis

: What This Test Measures

: Hemoglobin is the oxygen-carrying protein in red blood cells, and normally most hemoglobin is of the adult type. Electrophoresis separates the different hemoglobin types in your sample so the laboratory can see which fractions are present and roughly how much of each there is. This test focuses specifically on the fifth most predominant fraction detected.

: Why It Is Ordered

: Your healthcare provider may order this test when a routine hemoglobin evaluation shows an unexpected pattern or when there is suspicion of an inherited hemoglobin variant. Identifying a minor fraction can help explain findings such as an unusual red blood cell shape or an atypical screening result.

: How the Sample Is Collected

: A small blood sample is drawn from a vein, usually in your arm. The sample is then processed in the laboratory, where the hemoglobin types are separated by electrophoresis and the resulting pattern is examined.

: What the Results Mean

: Results describe which hemoglobin fraction appears as the fifth most abundant and how prominent it is relative to the others. Because normal patterns vary and interpretation depends on the full hemoglobin profile, your provider will interpret this result alongside your other tests, symptoms, and history rather than in isolation.