Influence of experimental conditions on the test results of cryoglobulin / 中华检验医学杂志

ABSTRACT

Objective This study was to observe the effects of different test conditions on the qualitative and quantitative detection of cryoglobulin .Methods We prepared 5 blood samples of different types of cryoglobulinemia . We detect the cryoglobulin qualitatively and quantitatively at different temperatures (37 ℃and room temperature of 20-25 ℃), and with different observation time (3 days and 7 days) and with different amount of blood (5 ml and 20 ml) .Further we will categorize the type of cryoglobulin and detect the components of cryoglobulin by immunofixation electrophoresis ( IFE) and other laboratory tests.Results (1) Blood samples from two groups were clotting and the serums were separated at 37 ℃ and room temperature respectively , and cryoglobulins of two groups were all qualitatively positive . Quantitative detection of cryoglobulins showed that the concentrations of cryoglobulins of room temperature group are lower than that of 37℃group;(2) Compared with 7 days, observing for only 3 days may lead to false-negative results in qualitative detection of cryoglobulin , and concentrations of cryoglobulin are also decreased;(3) Compared with 20 ml blood sample,5 ml blood sample is not enough for qualitative and quantitative detection of cryoglobulins .It may lead to false-negative results;(4) After purification, IFE and other laboratory tests can be used to categorize the types and find the components of cryoglobulins .Such examinations are helpful for finding the potential causes of cryoglobulinemia .Conclusions The positive of serum cryoglobulin is a key indicator of cryoglobulinemia .Detection of cryoglobulin can be affected by temperature, observed time and the blood volume for measurement .In addition, IFE and other laboratory tests are helpful for finding the type and the components of cryoglobulin .