| Methodology: |
Quantitative Radioimmunoassay
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| Performed: |
Wed
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| Reported: |
2-10 days
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| Specimen Required: |
Collect: Plain red. Also acceptable: Lavender (EDTA) or pink (K2EDTA).
Specimen Preparation: Allow plain red tube to sit for 15-20 min at room temperature for proper clot formation. Centrifuge and separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 2 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)
Storage/Transport Temperature: Frozen.
Remarks: Melatonin concentrations depend on age and on circadian rhythm, with maximum concentration at night between 1:00-3:00 a.m.
Unacceptable Conditions: Serum separator tube (SST). Hemolyzed or lipemic specimens.
Stability (collection to initiation of testing): Ambient: 24 hours; Refrigerated: 48 hours; Frozen: 3 months
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