Busulfan, Intravenous Dose, Area Under the Curve (AUC), Plasma
Method Description Describes how the test is performed and provides a method-specific reference
Busulfan analysis is performed by gas chromatography-mass spectrometry (GC-MS), with calculation of area under the curve (AUC) by integration of the time versus concentration curve from start of infusion to last sample collection (6-hour AUC).
AUC and clearance are calculated after quantification of busulfan concentration in blood plasma samples:
-1 sample drawn immediately after termination of a 2-hour intravenous (IV) infusion of 0.8 mg/kg busulfan
-1 sample drawn 1 hour after the infusion is terminated
-1 sample drawn 2 hours after the infusion is terminated
-1 sample drawn 4 hours after the infusion is terminated
The AUC is calculated by integration of the plot of time in minutes from the start of infusion until the last sample collection (independent variable), with busulfan concentration in umol/L (dependent variable), and with straight-line extrapolation of the immediate postinfusion busulfan concentration to time zero. Clearance is calculated as the dose divided by AUC.
The recommended optimal dose is calculated based on the assumption of an ideal AUC=1100 umol*min. (Slattery JT, Risler LJ: Therapeutic monitoring of busulfan in hematopoietic stem cell transplantation. Ther Drug Monit 1998 October;20:543-549)
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 Saturday; 2 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.
Same day/1 day
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