Methodology
Photometric
Synonyms
BUN
Specimen Type
Body Fluid
Performing Lab
Mayo Medical Lab
Epic ID
LAB90044
Lab Test Days
Daily
Standard TAT
1-2 Days
Collection Information
Specimen Required
0.5-1 mL Body Fluid (Peritoneal (abdominal) fluid, Pleural (chest) fluid, Drain fluid, Peritoneal (dialysis) fluid, or Pericardial (heart) fluid)
Container Type
Sterile Container
Processing Information - Lab Use Only
Transport Temperature
Room Temp-OK/Refrigerate-OK
Specimen Stability
Room Temp: 24 Hours; Refrigerated: 7 Days (preferred); Frozen: 30 Days
Rejection Criteria
Gross hemolysis; Gross lipemia; Gross icterus; CSF; Breast Milk; Saliva; Nasal secretions; Bronchial lavage (BAL) or bronchial washings; Colostomy/ostomy; Feces; Urine; Sputum; Vitreous fluid
Test Volume Required
1 mL Body Fluid
Minimum Test Volume
0.5 mL Body Fluid
Processing Instructions
Centrifuge to remove any cellular material and transfer into a plastic vial. Indicate source on specimen ID, specimen and on batch sheet. Order test in Mayolink and send with Mayo courier Monday-Friday.
CPT Codes
84520
Revised
6/12/25
Initials
SA