Prolactin, Total and Monomeric : 16122

Test Code
PROLTM or 16122

Alias/See Also
Macroprolactin; Big-Big Prolactin

CPT Codes

Total Prolactin. Free Prolactin.

Fasting specimen is recommended but not required.
Collect blood by venipuncture into plain tubes (without anticoagulant). Separate the serum from the cells.

Transport Container
Preferred Specimen
1 mL serum
Minimum Volume
0.4 mL

Transport Temperature
Room temperature.

Specimen Stability
Room temperature: 7 days; Refrigerated: 7 days; Frozen: 6 months

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis. Plasma.

Immunoassay (IA), PEG Precipitation

Setup Schedule

Report Available
2-9 days  (From receipt at performing laboratory)

Reference Range
By report.

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).

Performing Laboratory
Quest Diagnostics

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.