Test Code CAFN Caffeine, Serum
Useful For
Monitoring therapy in neonates
Assessing toxicity in neonates
Method Name
Enzyme Multiplied Immunoassay Technique (EMIT)
Reporting Name
Caffeine, SSpecimen Type
SerumSpecimen Required
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
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 aliquoted within 2 hours of collection.
Specimen Minimum Volume
0.25 mL
Specimen Stability Information
Specimen Type | Temperature | Time |
---|---|---|
Serum | Refrigerated (preferred) | 72 hours |
Frozen | 28 days | |
Ambient | 72 hours |
Reference Values
Therapeutic: 8.0-20.0 mcg/mL
Critical value: ≥30.0 mcg/mL
Day(s) and Time(s) Performed
Monday through Sunday; Continuously
Performing Laboratory

Test Classification
This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
80155
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
CAFN | Caffeine, S | 3422-3 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
CAFN | Caffeine, S | 3422-3 |