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Item Value
Approval req'd? Yes, contact Chemistry/Immunology Resident at 415-353-1438. Requires approval unless charged to a budget account.
Available Stat? No
Test code VERA
Performed by National Medical Service via Quest
Sendout? Yes
Method Gas Chromatography
Container type Red top (Gold top NOT acceptable)
Amount to Collect 8 mL blood
Sample type Serum
Preferred volume 4 mL serum
Min. Volume 1 mL serum
UCSF Rejection Criteria Collected in Gold top
Processing notes Order Nichols Test # 34522N or 34522X.
Units ng/mL
Normal range
Therapeutic 70-350 ng/mL for parent drug
Synonyms Isoptin; Calan
Stability Room temperature 2 weeks, refrigerated 1 month, frozen at -20C 18 months.
Turn around times Set up 5x per week, turnaround 3-5 days
Additional information Normal range not established for metabolite. Toxic range not established. Clinical effects correlate poorly with levels. Testing can only verify that the patient is taking and absorbing the drug.

Two to three fold greater plasma Verapamil concentrations are required after oral dosing, as compared to I.V.dosing, to elicit the same increase in a-v conduction time.

Reporting limit: 10 ng/mL. Less than 10 ng/mL, result reported as None Detected.
CPT coding 80299-90
LOINC code 4094-9
Last Updated 10/28/2013 11:49:02 AM
Entry Number 982
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