Expected Turnaround Time
2 - 3 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Related Information
FDA Cleared
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FDA Cleared |
Related Documents
Specimen Requirements
Specimen
Serum or plasma
Volume
1 mL
Minimum Volume
0.2 mL
Container
Red-top (no additive) tube or green-top (heparin) tube; gel-barrier tubes are not recommended
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Red-top |
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Red-top (no additive) tube or green-top (heparin) tube; gel-barrier tubes are not recommended |
Collection
Transfer separated serum or plasma to a plastic transport tube.
Storage Instructions
Submission/transport (<3 days): Room temperature. For storage beyond three days, specimen should be refrigerated or frozen.
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Submission/transport (<3 days): Room temperature. For storage beyond three days, specimen should be refrigerated or frozen. |
Stability Requirements
| Temperature | Period |
|---|---|
| Room temperature | 14 days |
| Refrigerated | 14 days |
| Frozen | 14 days |
| Freeze/thaw cycles | Stable x3 |
Test Details
Use
This test is used for therapeutic drug management.
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Monitor caffeine concentration in newborns receiving theophylline or caffeine. Half-life elimination: Neonates 72 to 96 hours, Children >9 months and Adults: 5 hours Time to peak serum, oral: Within 30 minutes to 2 hours |
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This test is used for therapeutic drug management. |
Methodology
Immunoassay (IA)
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Immunoassay (IA) |
Reference Interval
8.0–20.0 µg/mL
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• Therapeutic: 3.0−15.0 μg/mL • Neonatal apnea: 8−14 μg/mL • Infant (<1 year): 8−20 μg/mL |
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8.0–20.0 µg/mL |
LOINC® Map
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