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A red blood cell in a hypotonic solution, causing water to move into the cell A red blood cell in a hypertonic solution, causing water to move out of the cell. Hemolysis or haemolysis (/ h iː ˈ m ɒ l ɪ s ɪ s /), [1] also known by several other names, is the rupturing of red blood cells (erythrocytes) and the release of their contents into surrounding fluid (e.g. blood plasma).
The sucrose lysis test is a diagnostic laboratory test used for diagnosing paroxysmal nocturnal hemoglobinuria (PNH), as well as for hypoplastic anemias and any hemolytic anemia with an unclear cause. [1] The test works by using sucrose, which creates a low ionic strength environment that allows complement to bind to red blood cells. [1]
The direct Coombs test is used to test for autoimmune hemolytic anemia, a condition where the immune system breaks down red blood cells, leading to anemia. The direct Coombs test is used to detect antibodies or complement proteins attached to the surface of red blood cells. To perform the test, a blood sample is taken and the red blood cells ...
Laboratory studies commonly used to investigate hemolytic anemia include blood tests for breakdown products of red blood cells, bilirubin and lactate dehydrogenase, a test for the free hemoglobin binding protein haptoglobin, and the direct Coombs test (also called direct antiglobulin test or DAT) to evaluate complement factors and/or antibodies ...
Diagnosis of hemolytic jaundice is based mainly on visual assessment of the yellowing of the patient's skin and sclera, while the cause of hemolysis must be determined using laboratory tests. [10] Treatment of the condition is specific to the cause of hemolysis , but intense phototherapy and exchange transfusion can be used to help the patient ...
(left) α-hemolysis (S. mitis); (middle) β-hemolysis (S. pyogenes); (right) γ-hemolysis (non-hemolytic, S. salivarius) Hemolysis is the breakdown of red blood cells. The ability of bacterial colonies to induce hemolysis when grown on blood agar is used to classify certain microorganisms. This is particularly useful in classifying ...
Following confirmation of hemolysis (seen with laboratory markers of low hemoglobin, elevated LDH, decreased haptoglobin, and elevated unconjugated bilirubin), a direct antiglobulin test (DAT)(also known as a Coomb's test) is done to show auto-immune pathogenesis with antibodies, complement or both on the erythrocyte surface. [4]
Uses of erythrocyte mechanical fragility can include diagnostic testing, [11] calibrations to aid comparisons of hemolysis caused by blood-handling devices, [9] or assessment of sublethal (i.e., non-hemolysing) damage caused to cells from devices that manipulate blood (such as for dialysis [12] or intraoperative autotransfusion [13]).
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