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Test Code LAB24 Valproic Acid (Depakote)

Department

CHEMISTRY

Collection Requirements

PEAK AND TROUGH DRUG LEVELS SHOULD BE DRAWN DURING THE SAME DOSE CYCLE, with the Peak drawn 1-4 hours after the dose and the Trough drawn immediately prior to the next dose.

Primary Collection Container

Green PST (Lithium Heparin)

Alternate Collection Container

Green Microtainer PST

Transport

Refrigerated

Preferred Transport Temperature

Refrigerated

Processing

Centrifuge and refrigerate.

Separate from gel if testing is to be delayed more than 8 hours.

Stability

Ambient: 8 hours

Refrigerated: 48 hours, if separated from gel

Minimum Testing Volume

0.1 mL

Reference Range

50 – 100 µg/ml

Methodology

The methodology for VALP is based on a homogeneous particle enhanced turbidimetric inhibition immunoassay (PETINIA) technique which uses a synthetic particle valproic acid conjugate (PR) and monoclonal valproic acid specific antibody (Ab). Valproic acid present in the sample competes with valproic acid on the particles for available antibody, thereby decreasing the rate of aggregation. Hence, the rate of aggregation is inversely proportional to the concentration of valproic acid in the sample. The rate of aggregation is measured using bichromatic turbidimetric readings at 340 nm and 700 nm. Siemens Dimension Vista.

Performed

Sunday – Saturday

Reported

As completed

CPT Codes

80164

Unacceptable Conditions

Specimens on gel longer than 8 hours.