Test Directory

Clear All
Test Code
QPLTN
Test Name
Prolactin, Total and Monomeric
CPT Codes
84146 X 2
Included Tests
  • Prolactin, Total
  • Prolactin, Monomeric
Expected Turnaround Time
3 - 10 days
Clinical Utility
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).
Specimen and Container Info

Specimen Type: Serum

Collection Container: Gold Top, Serum Separator

Desired Specimen Volume: 1 mL
Collection Instructions
  1. Collect a gold top, serum separator tube via venipuncture.
Processing and Submission Instructions
  1. Separate serum from cells.
  2. Transfer 1 mL of serum to a clear aliquot tube (screw cap).
Transport Instructions

Transport to the laboratory refrigerated. 
Stability Requirements

Room Temperature

7 days

Refrigerated

7 days

Frozen

6 months
Methodology
Immunoassay / PEG Precipitation
Reference Intervals

See patient report.

Alternate Names
  • Macroprolactin
  • Big-Big Prolactin
Reference Lab
Quest Diagnostics Nichols Institute
Testing Schedule
Routine, 1 time per week
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
© 2026 HNL Lab Medicine. All rights reserved.