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Blood Urea NitrogenAka: BUN
- Pathophysiology
- Increases by 10-20 mg/dl/day if Renal Function absent
- Serum Creatinine is a better measure of Renal Function
- BUN is Protein dependent
- High protein diet
- Catabolism
- BUN is reabsorbed at renal tubules
- Prerenal Failure
- Dehydration
- Congestive Heart Failure
- Postrenal Failure
- Obstructive Uropathy
- Prerenal Failure
- BUN is Protein dependent
- Increased BUN
- Medications
- Dehydration
- Gastrointestinal Bleeding
- Decreased Renal blood flow
- Renal disease
- Urinary Tract Obstruction
- Decreased BUN
- Liver disease
- Poor nutrition
- Overhydration
- Third trimester of pregnancy
Blood urea nitrogen measurement (C0005845) | |
|---|---|
| Definition (MSH) | The urea concentration of the blood stated in terms of nitrogen content. Serum (plasma) urea nitrogen is approximately 12% higher than blood urea nitrogen concentration because of the greater protein content of red blood cells. Increases in blood or serum urea nitrogen are referred to as azotemia and may have prerenal, renal, or postrenal causes. (From Saunders Dictionary & Encyclopedia of Laboratory Medicine and Technology, 1984) |
| Definition (NCI) | A measurement of the urea nitrogen in a blood specimen. |
| Definition (NCI) | A quantitative measurement of the amount of urea nitrogen present in a sample of serum. |
| Concepts | Laboratory Procedure (T059) |
| MSH | D001806 |
| English | Blood urea, Blood urea measurement, Blood Urea Nitrogen, Blood urea nitrogen measurement, BUN, BUN measurement, Urea - blood |
| Spanish | determinacion de uremia, medicion de BUN, medicion de nitrogeno ureico en sangre, medicion de NUS, medicion de uremia |
| Parent Concepts | Blood Chemical Analysis (C0005774), Kidney Function Tests (C0022662), Serum Chemistry Measurement (C1883010), Blood Tests (C0018941), Urea nitrogen measurement (C0202238), Fluid sample urea measurement (C0428276), Duplicate concept (C1274013) |
| Sources | CSP, MSH, MTH, NCI, SCTSPA, SNOMEDCT Derived from the NIH UMLS (Unified Medical Language System) |
