THEOPHYLLINE, serum (087-0374)

Synonyms: Aminophylline, Theodur

CPT 4 Code: 80198

Test Order Mnemonic: THEO

Lab: Clinical Chemistry

Request Form: Special Chemistry Form 1

Collection: Routine venipuncture. The usual sampling times for intravenous dosing are: Trough - prior to intravenous infusion; Peak - 30 minutes after completion of leading dose; or at timed intervals to evaluate therapy. For oral dosing, the usual sampling times are: Peak - 2 hours after rapid release product or 4 hours after sustained release product; Trough - immediately before next dose.

Storage Instructions: Centrifuge the specimen to separate serum from cells within 2 hours of collection. Refrigerate at 2-8°C.

Causes for Rejection: Gross hemolysis, improperly labeled specimen, specimen QNS

Availability: Samples are received 24 hours per day at Sample Management, Room 5.136 McCullough.

Turnaround Time: Routine: 4 hrs, STAT: 1 hour

Specimen: Blood

Volume: 7mL blood

Minimum Volume: 0.5 mL serum

Container: Red-topped tube

Reference Ranges: Therapeutic: 10-20 mcg/mL

Significant Values: Toxic: >20 mcg/mL

Test Method: Rate Two Point

Reviewed/revised April 2007 by P. Harris