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Test Code CAFF Caffeine, 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 Serum

Collection Instructions:

1. Within 2 hours of collection, centrifuge the specimen.

2. For serum gel tubes, serum may sit on the gel or be aliquoted into a plastic vial.

3. For red top tubes, aliquot serum into a plastic vial immediately after centrifugation.


Useful For

Monitoring caffeine therapy in neonates

 

Assessing caffeine toxicity in neonates

Method Name

Enzyme Multiplied Immunoassay Technique (EMIT)

Reporting Name

Caffeine, S

Specimen Type

Serum

Specimen Minimum Volume

Serum: 0.25 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen (preferred) 28 days
  Ambient  72 hours
  Refrigerated  72 hours

Reject Due To

Gross hemolysis Reject

Reference Values

Therapeutic: 8.0-20.0 mcg/mL

Critical value: ≥30.0 mcg/mL

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

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.