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Test Code Proca G Procainamide and N-Acetylprocainamide, Serum


Specimen Required


Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions:

1. Serum gel tubes should be centrifuged within 2 hours of collection.

2. Red-top tubes should be centrifuged and the serum aliquoted into a plastic vial within 2 hours of collection.


Useful For

Monitoring therapy with procainamide

 

Assessing compliance

 

Evaluating procainamide toxicity

Method Name

Homogeneous Enzyme Immunoassay

Reporting Name

Procainamide and NAPA, S
Seattle Children's Hospital Note:

SCH Clinical System Name: Procainamide Group

Specimen Type

Serum

Specimen Minimum Volume

0.25 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Frozen (preferred) 14 days
  Refrigerated  7 days
  Ambient  24 hours

Reject Due To

Gross hemolysis Reject

Reference Values

Procainamide

Therapeutic: 4.0-10.0 mcg/mL

Critical value: >12.0 mcg/mL

 

N-acetylprocainamide

Therapeutic: 12.0-18.0 mcg/mL

Critical value: ≥40.0 mcg/mL

Method Description

These assays are based on a homogeneous enzyme immunoassay technique. The assay is a competition assay between the drug in the sample and drug labeled with the enzyme glucose-6-phosphate dehydrogenase (G6PD) for antibody binding sites. Enzyme activity decreases upon binding to the antibody, so the drug concentration in the sample can be measured in terms of enzyme activity. Active enzyme converts oxidized nicotinamide adenine dinucleotide (NAD) to NADH, resulting in an absorbance change that is measured spectrophotometrically. Endogenous serum G6PD does not interfere because the coenzyme functions only with the bacterial (Leuconostoc mesenteroides) enzyme employed in the assay.(Package inserts: Procainamide and N-acetylprocainamide. Roche Diagnostics; 08/2015)

Day(s) Performed

Monday through Saturday

Report Available

Same day/1 to 2 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

80192

LOINC Code Information

Test ID Test Order Name Order LOINC Value
PA Procainamide and NAPA, S 3983-4

 

Result ID Test Result Name Result LOINC Value
8683 Procainamide, S 3982-6
2461 N-acetylprocainamide, S 3834-9
2462 Procainamide + NAPA 3983-4

Forms

If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.