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Test Code Caffeine Caffeine

Performing Laboratory

Women and Children's Hospital Laboratory 304-388-2385

Specimen Requirements

Serum- red top, no gel

Allow red top to completely clot      

Spin and physically separate serum from contact with cells as soon as possible

4 mL of serum (minimum 2 mL)

Specimen Rejection

  • Improperly labeled, collected, stored, and transported
  • Quantity not sufficient

Storage and Stability

Store and transport at 2-8o C

Reference Values

Observed therapuetic ranges for caffeine in neonates has been reported to be 8-20 mcg/mL. Literature indicates that toxicity occurs when the serum level of caffeine exceeds 50 mcg/mL.

Critical Value: > 50.0 mcg/mL

Methodology

Homogenous enzyme immounoassay

Days Test Set Up and Turnaround

Monday through Sunday, Continuously

AM Collection Expected by 9AM same day
Routine Expected within 24 hrs
Stat Expected within 1 hr
Timed Expected results are test dependant

CPT Coding

80155