Urea

Background

Urea is one of the principal products of the breakdown of body proteins and is excreted by the kidneys into the urine. Raised urea levels are associated with renal failure, dehydration, chronic cardiac failure and haematemesis. Low levels are associated with pregnancy and people on a low protein diet.

Reference ranges

Serum: 2.5 – 7.0 mmol/L
Urine: 165 – 583 mmol/24hours

Specimen requirements

Sample type:

• Serum or Plasma treated with Lithium Heparin.
• Random urine or 24 hour urine specimen in a plain bottle.

Sample Identification:

• Three patient identifiers from
  • Name
  • DOB
  • Address
  • NHS number
  • Unit number
  should match on the specimen and request form. This check may be performed prior to centrifugation by the Central Sort department.

Turnaround time

2 hours