Laboratory Medicine

Test catalogue

Theophylline
Test Name Theophylline
Specimen Type/Requirements Container Type = 1 Red Top Minimum Testing Volume = 0.5 mL serum
Specimen Handling Collection Instructions: Serum collected in red top vacutainer (without gel separator). The sample is preferably collected before administration of the next dose. To obtain comparable concentrations in a patient samples for drug levels should be collected at the same time in relation to the dose that is taken. Write your initials, date and time of collection on the collection label or requisition. Special Instructions: Separate samples from cells as soon as possible. Repeated freezing and thawing of samples should be avoided Rejection Criteria: Gel separator, grossly hemolyzed and icteric samples, Unlabeled or Not Sufficient Quantity Samples will be rejected. Stability: Stable at room temperature for 3 days, refrigerated for 7 days and months for 90 days. Transportation: Send sample to core lab as soon as possible.
Required Documentation
Turnaround Time (TAT) STAT: 1 hour Routine: 2 hours	Test Utilization N/A
Reference Value Therapeutic: 55-110 umol/L Toxic: > 110 umol/L
Test Code LAB35	Methodology KIMS Immunoassay
Testing Location SMH-Biochemistry	Other Information Last Updated: June 22, 2026

Theophylline

Test Name

Theophylline

Specimen Type/Requirements

Container Type = 1 Red Top

Minimum Testing Volume = 0.5 mL serum

Specimen Handling

Collection Instructions: Serum collected in red top vacutainer (without gel separator). The sample is preferably collected before administration of the next dose. To obtain comparable concentrations in a patient samples for drug levels should be collected at the same time in relation to the dose that is taken. Write your initials, date and time of collection on the collection label or requisition.

Special Instructions: Separate samples from cells as soon as possible. Repeated freezing and thawing of samples should be avoided

Rejection Criteria: Gel separator, grossly hemolyzed and icteric samples, Unlabeled or Not Sufficient Quantity Samples will be rejected.

Stability: Stable at room temperature for 3 days, refrigerated for 7 days and months for 90 days.

Transportation: Send sample to core lab as soon as possible.

Required Documentation

Turnaround Time (TAT)

STAT: 1 hour

Routine: 2 hours

Test Utilization

N/A

Reference Value

Therapeutic: 55-110 umol/L

Toxic: > 110 umol/L

Test Code

LAB35

Methodology

KIMS Immunoassay

Testing Location

SMH-Biochemistry

Other Information

Last Updated: June 22, 2026