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Test ID MCRPL Macroprolactin, Serum

Useful For

Determining biologically active levels of prolactin, in asymptomatic patients with elevated prolactin levels

 

Ruling out the presence of macroprolactin

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum


Specimen Required


Patient Preparation: For 12 hours before specimen collection do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins.

Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions: Centrifuge and aliquot serum into a plastic vial.


Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 7 days
  Frozen  90 days
  Ambient  24 hours

Reference Values

PROLACTIN, TOTAL

Males

<18 years: not established

≥18 years: 4.0-15.2 ng/mL

Females

<18 years: not established

≥18 years: 4.8-23.3 ng/mL

 

PROLACTIN, UNPRECIPITATED

Males

<18 years: not established

≥18 years: 2.7-13.1 ng/mL

Females

<18 years: not established

≥18 years: 3.4-18.5 ng/mL

 

When the percent of the precipitated (complexed) prolactin fraction of the total prolactin is 60% or less, the result is considered negative for macroprolactin.

Day(s) Performed

Monday through Sunday

CPT Code Information

84146 x 2

Report Available

Same day/1 to 3 days

Reject Due To

Gross hemolysis Reject
Gross lipemia OK

Secondary ID

34643

Forms

If not ordering electronically, complete, print, and send an Oncology Test Request (T729) with the specimen.