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Phenobarbital, unbound-994

Test info

Test name:

Phenobarbital, unbound

Test number:

994

Excellian order number:

LAB994

Abbreviation:

MSO

Alternate names:

Luminal
Phenobarbital, free

Useful for:

Therapeutic drug management

Specimen

Specimen type:

Serum

Collection container:

Red serum vial/tube - 5 mL

Volume:

3.0 mL

Minimum volume:

1.0 mL

Collection instructions:

Trough levels are most reproducible

Processing instructions:

Allow sample to clot
Spin
Transfer serum to a Transfer vial/tube with cap - 12mL (LabCorp), labelled as serum, within two (2) hours of sample collection

Transport container:

Transfer vial/tube with cap - 12mL (LabCorp)

Alternate specimen type:

Heparin plasma

Alternate collection container:

Dk green heparin (Li or Na), no gel

Alternate collection instructions:

Immediately following collection, mix sample thoroughly by gently inverting 8 - 10 times to prevent clotting

Alternate processing instructions:

Spin
Transfer plasma to a Transfer vial/tube with cap - 12mL (LabCorp), labelled as the appropriate plasma type, within two (2) hours of sample collection

Transport and stability:

Ambient - 3 days

For storage beyond three days, specimen should be refrigerated or frozen.

Reason for rejection:

Gel-barrier tubes

Performance

Performing lab:

MedTox Laboratories (94) via LabCorp (809166): R-NX

Days set up:

Daily

TAT:

1 - 3 days

Method:

Immunoassay (IA); Ultrafiltration

Clinical and Interpretive info

Reference ranges:

6.0 − 20.0 µg/mL

Results that require action (critical):

>25.0 µg/mL

Billing

CPT codes:

80184

LOINC code:

Result 3951-1

Tracking

Date created:

05/20/2019

Revised date:

07/12/2023

Review date:

07/12/2023