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Test Code LAB706 Caffeine, Serum

Additional Codes

CAFF


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.


Secondary ID

8754

Useful For

Monitoring caffeine therapy in neonates

 

Assessing caffeine toxicity in neonates

Method Name

Enzyme Multiplied Immunoassay Technique (EMIT)

Specimen Type

Serum

Specimen Minimum Volume

0.25 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Frozen (preferred) 28 days
  Ambient  72 hours
  Refrigerated  72 hours
Medical University of South Carolina Note:

On-campus collections: Send in plastic vial, Frozen.
 
Off-campus collections: Centrifuge and aliquot within 1 hour. Specimen to be stored/transported at Frozen temp.

Reject Due To

Gross hemolysis Reject

Reference Values

Therapeutic: 8.0-20.0 mcg/mL

Critical value: ≥30.0 mcg/mL

Interpretation

Optimal pharmacologic response occurs when the serum level is in the range of 8.0 to 20.0 mcg/mL.

 

Toxicity in neonates and adults may be seen when the serum level is above 20.0 mcg/mL.

Method Description

The enzyme-multiplied immunoassay technique assay is a homogeneous enzyme immunoassay technique used for the analysis of specific compounds in biological fluids. The assay is based on competition between 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 can be measured spectrophotometrically. Endogenous serum G6PD does not interfere because the coenzyme functions only with the bacterial (Leuconostoc mesenteroides) enzyme employed in the assay.(Package insert: Caffeine Reagent. Seimens Healthcare Diagnostics, Ltd; 03/2015)

Day(s) Performed

Monday through Saturday

Report Available

Same day/1 to 2 days

Specimen Retention Time

2 weeks

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

80155

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CAFF Caffeine, S In Process

 

Result ID Test Result Name Result LOINC Value
8754 Caffeine, S 3422-3

Forms

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