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HelpTest Code LAB35 Theophylline, Serum
Specimen Required
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions:
1. Serum gel tubes should be centrifuged within 2 hours of collection.
2. Red-top tubes should be centrifuged and the serum aliquoted into a plastic vial within 2 hours of collection.
Useful For
Assessing and adjusting theophylline dosage for optimal therapeutic level
Assessing theophylline toxicity
Reporting Name
Theophylline, SSpecimen Type
SerumSpecimen Minimum Volume
0.25 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 14 days | |
| Frozen | 28 days | ||
| Ambient | 72 hours |
Reject Due To
| Gross hemolysis | Reject |
Reference Values
Therapeutic:
Bronchodilation: 8.0-20.0 mcg/mL
Neonatal apnea (≤4 weeks old): 6.0-13.0 mcg/mL
Critical value: >20.0 mcg/mL
Day(s) Performed
Monday through Saturday
Report Available
Same day/1 to 2 daysSpecimen Retention Time
2 weeksPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
80198
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| THEO | Theophylline, S | 4049-3 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 8661 | Theophylline, S | 4049-3 |
Forms
If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.