Test Catalog

Take Our Survey

Test ID: RIAS    
Ristocetin Inhibitor Assay Screen, Plasma

Method Description Describes how the test is performed and provides a method-specific reference

Antibodies to von Willebrand factor (VWF) are detected functionally by determining the degree of inhibition of ristocetin-induced agglutination. Ristocetin is an antibiotic which produces agglutination of normal platelets in the presence of VWF.(Mannucci PM, Lombardi R, Bader R, et al: Studies of the pathophysiology of acquired von Willebrand's disease in seven patients with lymphoproliferative disorders or benign monoclonal gammopathies. Blood 1984;64:614-621)

PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information


Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.

Monday through Friday; p.m.

Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.

1 day

Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result

8 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

14 days

Performing Laboratory Location The location of the laboratory that performs the test