1,25-Dihydroxyvitamin D, Serum
Method Description Describes how the test is performed and provides a method-specific reference
Deuterated stable isotopes (d3-1,25 dihydroxyvitamin D3 [DHVD3-d3] and d6-1,25 dihydroxyvitamin D2 [DHVD2-d6]) are added to a 1-mL plasma sample as internal standard. 1,25-Dihydroxyvitamin D2 (DHVD2), 1,25-dihydroxyvitamin D3 (DHVD3), and the internal standard are extracted using acetonitrile precipitation. The extracts are then further purified by SPE and affinity extraction. Extracts are then derivatized using 4-phenyl-1, 2,4-triazoline-3,5-dione (PTAD) and analyzed by chromatography-tandem mass spectrometry using multiple reaction monitoring with a C18 turbo cleanup for excess derivatizing reagent. DHVD2 and DHVD3 are quantified and a total is reported with a clinical reference range attached to the total DHVD.(Unpublished Mayo method)
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; 3 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.
Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result
Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded
Performing Laboratory Location The location of the laboratory that performs the test