Caffeine
| Abbrev Code: | CAF | ||
| Order Code: | LAB1217 | Order Name: | Caffeine, Serum or Plasma |
| Methodology: | Quantitative enzyme multiplied immunoassay technique | ||
| CPT Codes: | 80155 x1, 8015501 x1 | ||
| Turnaround Time: | Specimens are sent to the reference laboratory Sun-Sat; results are reported within 1-5 days. | ||
| Compliance: | This test uses an in vitro diagnostic (IVD) that has been cleared or approved by the FDA. |
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Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 1 mL |
| Minimum\Peds Volume: | 0.6 mL |
| Container: | Red (no gel) Alternate Containers: Purple (EDTA) |
| Collection Instructions: | Usual sampling time is immediately prior to next dose (trough). |
| Causes for Rejection: | Citrated plasma; collected in a gel tube. |
Processing and Shipping
| Specimen Processing: | Centrifuge and separate from cells ASAP or within 6 hours of collection. Aliquot 0.5 mL, 0.2 mL minimum serum or plasma. Store in refrigerator. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | 1 week at room temperature or refrigerated; 2 months frozen. |
| Test Performed at or Referral Lab | Lab Sendouts (ARUP) |
| Referral Lab number: | 2011603 |
Interpretive
| Critical Range: | Toxic Level: >20 μg/mL.
Toxic concentrations may cause tremor, cardiac abnormalities and seizures. |
| Therapeutic Range: | 0-28 days: 8-20 μg/mL
29 days & older: ≤20 μg/mL (not well established) |
| Use: | Therapeutic monitoring for patients receiving caffeine therapy. |
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