Sucrose Hemolysis Test (Serum/Plasma)

What This Test Measures

The sucrose hemolysis test evaluates how red blood cells (RBCs) respond to osmotic stress caused by sucrose. Normally, RBCs maintain their shape and function even when exposed to high concentrations of sucrose. If RBCs are damaged (e.g., due to hereditary spherocytosis, G6PD deficiency, or other hemolytic conditions), they may lyse (break apart) more easily, releasing hemoglobin into the serum/plasma. This test helps identify whether RBCs are structurally compromised.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms like fatigue, jaundice, dark urine, or unexplained anemia. It’s also used to screen for inherited blood disorders that cause RBC destruction, such as hereditary spherocytosis or elliptocytosis.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in the arm. The sample is collected in a tube containing an anticoagulant (like EDTA or citrate) to prevent clotting. The serum or plasma is separated for testing and analyzed for sucrose-induced hemolysis within 24 hours of collection.

What to Expect Before the Test

No special preparation is needed, but inform your provider about any medications (e.g., blood thinners) or conditions that might affect results. Avoid strenuous activity 24 hours before testing to ensure accurate blood collection.