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Prolactin, Total and Monomeric
Test Code16122
CPT Codes
84146 (x2)
Includes
Prolactin, Total
Prolactin, Monomeric
Prolactin, Monomeric
Preferred Specimen
1 mL serum
Patient Preparation
Fasting specimen is recommended but not required
Minimum Volume
0.4 mL
Instructions
Collect blood by venipuncture into plain tubes (without anticoagulant). Separate the serum from the cells.
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 6 months
Refrigerated: 7 days
Frozen: 6 months
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis • Plasma
Methodology
Immunoassay (IA) • PEG Precipitation
Setup Schedule
Set up: Wed; Report Available: 2-9 days
Clinical Significance
For some patients the level of Prolactin measured by immunoassay may be inaccurate with respect to the level of monomeric, biologically active Prolactin. The Macroprolactin by PEG Precipitation test can help to identify if a patient sample has elevated Prolactin due to mostly inactive protein-bound Prolactin (Macroprolactin).