Test Code ITRAS Itraconazole LC-MS/MS (Serum)
Clinical Indications
Patient variability in the pharmacokinetics of itraconazole
supports quantitative monitoring of blood drug levels,
particularly
due to its variable absorption. Monitoring trough levels of
intraconazole and hydroxyitraconazole (the metabolite of
intraconazole) is suggested in the first 1 – 2 weeks of
treatment to ensure therapeutic levels have been achieved.
Results
may be clinically useful to determine if current dosing levels
require adjustment for ongoing treatment.
Additional Test Codes
Epic Order Name: ITRACONAZOLE LC-MS/MS
(aka ITRAS)
Sunquest Order Code: ITRAS
Epic Px Code: LAB2961
Specimen Collection Type
Red-top (no additive) tube
Minimum Collection Volume
0.5 mL
Reference Range
0.1-10 mcg/mL
Critical Value
N/A
Interpretation
The successful management of transplant rejection and graft
vs.
host disease (GVHD) continues to pose a
difficult challenge for physicians treating solid organ and
bone
marrow transplant patients. Immunosuppressive drugs are
commonly
used to prevent rejection in these patient populations.
Compliance
with immunosuppressive therapy is essential to long term
survival,
however provides the additional risks of infection. Therapeutic
drug monitoring of immunosuppressive medication is required due
to
variable metabolism, absorption and drug interactions. By using
drug level monitoring with timely results, the physician is able
to
individualize drug dosage to improve efficacy and reduce
toxicity.
Rejection Criteria
Specimens not received in the lab within 60 minutes of
collection, blood collected in any tube other than a plain
red-top
(no additive) tube. Gel tubes are not acceptable.
Specimen Availability for Add-on Testing
This test cannot be added on (Critical frozen)
Specimen Stability
Frozen: 14 days
Refrigerated: Unacceptable
Ambient: Unacceptable
Day(s) Performed
Monday through Saturday
Performing Lab- Department
TUKHS-BH-Mail Outs
CPT Code
80299
LOINC Code
N/A
Test Alias
Sporanox, Serum
Additional Information / Notes
Turnaround time: Same day (within 8 – 12 hours from
receipt of specimen)