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Theophylline

Source Blood
Mnemonic THEO
Specimen Requirements

1 x 3 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

Minimum Whole Blood Volumes for Microcollections

Collect specimen 0-60 minutes prior to next oral dose.

For IV dosing, collect 30 minutes after completion of loading dose and 4-6 hours after beginning infusion.

Specimen Handling
Additional Information

Record time of last dose on requisition.

For additional information, see Half-life and Time to Steady State.

Testing Location Chemistry-FMC
Testing Frequency Daily
Alternate Name(s) Somophyllin, Aminophylline
Reference Interval

Therapeutic range:

< 32 days

25 - 110.0 umol/L

32 days – 150 years

55 - 110.0 umol/L

Click here for critical values.