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*UREA NITROGEN, BLOOD

Mnemonic

BUN

Synonym

Urea Nitrogen (UN) in Serum/Plasma - Blood Urea Estimate - Blood Urea Nitrogen (BUN) - BUN

Specimen Collection Requirements

Collect

Serum or Plasma, one 5.0 mL gold (SST), 7.0 mL red or 3.0 mL mint green (lithium heparin, PST) top tube

Handling

Allow serum to clot completely at room temperature (minimum: 30 minutes). Preferably, separate serum or plasma from cells before transport.

Preferred Volume

1.0 mL

Minimum Volume

0.25 mL Serum or Plasma, (Whole Blood 0.60 mL minimum draw)

Transport

Refrigerated (2-8°C)

Rejection Criteria

Grossly hemolyzed specimens

Stability

AFTER SEPARATION FROM CELLS: Ambient (18-26°C): 24 hours; Refrigerated (2-8°C): 7 days; Frozen (at or below -20°C): 3 months

Testing Information

Performed

7 days/week

Reported

24 hours

Method

Enzymatic

Reference Values

Reference Values

Critical Values

For critical age related ranges see Chemistry Related Reference Ranges and Critical Values.

CPT Codes

84520

Last Updated: Thursday, January 5, 2017 03:41:42 AM


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