Analytical, Diagnostic and Therapeutic Techniques, and Equipment

Blood Urea Nitrogen

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)

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

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)

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Synonyms

3 entry terms
  • BUN
  • Nitrogen, Blood Urea
  • Urea Nitrogen, Blood

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Indexing Annotation

note category; AZOTEMIA is available for the disease

MeSH Record

History Note

67(64)

MeSH Hierarchy

Tree Numbers

  1. E01w.370.225.124.100w.115w
  2. E01w.370.390.400.100w
  3. E05.200.124.100w.115w

AMA Style

References

  1. National Library of Medicine. Blood Urea Nitrogen. Medical Subject Headings (MeSH). 2026. Unique ID D001806. http://id.nlm.nih.gov/mesh/2026/D001806
  2. Blood Urea Nitrogen. In: Wikipedia. https://en.wikipedia.org/wiki/Blood_urea_nitrogen
  3. Blood Urea Nitrogen. In: Wikidata. https://www.wikidata.org/wiki/Q764079