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Test Code LAB4160 PHENOBARBITAL LEVEL

Specimen Type

Preferred Sample: Lithium Heparin Plasma (Mint Green Top, Dark Green Top)
Alternative Sample: Serum (SST, Gold, Corvac, Tiger, Red Top Tube) EDTA Plasma (lavender Top)

Collection Instructions

Draw just prior to next dose. Note times of dose and drawing.

Specimen Volume

1 mL

Minimum Volume

0.5 mL

Turnaround Time

STAT: 1 hour
Routine: 4 hours

Test Schedule

Daily

Sample Stability

Room Temp: 7 days
Refrigerated: 6 months
Frozen: 6 months

Method

Colorimetric

Reference Ranges

Phenobarbital µg/mL

            Therapeutic: 15.0-40.0

            Toxic: Greater than 50.0

Reporting Limit

2.0 - 131.3 ug/mL

Synonyms

Luminal

Test Components

Phenobarbital, µg/mL.

CPT Codes

80184

Limitations

Studies have shown that therapeutic drug levels may be altered in serum/plasma that remains in contact with separator gel. Therapeutic drug levels collected in an SST or PST should be run wtihin 24 hours of collection.