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Blood Urea Nitrogen (BUN) CPT: 84520

Synonyms

Blood Urea Nitrogen

BUN

Expected Turnaround Time

Within 1 day

Specimen Requirements

Specimen

Serum (preferred) or plasma

Volume

1 mL

Minimum Volume

0.5 mL

Container

Gel-barrier tube, green-top (lithium heparin) tube, or lavender-top (EDTA) tube; do not use ammonia heparin tube.

Collection

Separate serum or plasma from cells within 45 minutes of collection.

Storage Instructions

Room temperature

Stability Requirements

Temperature Period
Room Temperature 14 days
Refrigerated 14 days
Frozen 14 days
Freeze/thaw/ cycles Stable x 3

Patient Information

To evaluate the health of your kidneys; to help diagnose kidney disease; to monitor the effectiveness of dialysis and other treatments related to kidney disease or damage.

As part of a routine comprehensive or basic metabolic panel (CMP or BMP) during a health exam; when you have signs and symptoms that may be due to kidney disease or you have a condition that may cause or be worsened by kidney dysfunction; at regular intervals when you are being treated for kidney disease or damage.

A blood sample drawn from a vein.