出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2015/03/13 13:37:46」(JST)
BUN
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Blood urea nitrogen | |
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Diagnostics | |
Urea
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MeSH | D001806 |
LOINC | 6299-2, 59570-2, 12961-9, 12963-5, 12962-7 |
The liver produces urea in the urea cycle as a waste product of the digestion of protein. Normal human adult blood should contain between 6 to 20 mg of urea nitrogen per 100 ml (6–20 mg/dL) of blood. Individual laboratories may have different reference ranges, and this is because the procedure may vary.[1][2]
Blood urea nitrogen (BUN) is an indication of renal (kidney) health. Normal ranges 1.8-7.1 mmol/L.
The main causes of an increase in BUN are: high protein diet, decrease in Glomerular Filtration Rate (GFR) (suggestive of renal failure) and in blood volume (hypovolemia), congestive heart failure, gastrointestinal hemorrhage,[3] fever and increased catabolism.
The main causes of a decrease in BUN are severe liver disease, anabolic state, and syndrome of inappropriate antidiuretic hormone.[3]
Another cause of a decreased BUN is OTC deficiency which is inherited by a X-linked recessive pattern and is also accompanied by hyperammonemia, and in increased in orotic acid.
BUN (urea-N) is mg/dL in the United States, Mexico, Italy, Austria, and Germany. Elsewhere, the concentration of urea is reported as mmol/L, generally depending on the lab.
To convert from mg/dL of blood urea nitrogen to mmol/L of urea, multiply by 0.357 (each molecule of urea having 2 nitrogens, each of molar mass 14g/mol)
convert BUN to urea in mg/dL by using following formula:
(conversion factor derived by: MW of urea = 60, MW of urea nitrogen = 14x2 => 60/28 = 2.14)
factor = 1 for conversions in mmol (1 mole N2 = 2 moles N per mole of urea):
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国試過去問 | 「110D009」「109G039」 |
リンク元 | 「100Cases 60」「急性膵炎」「抗利尿ホルモン不適合分泌症候群」「基準値」「血液尿素窒素」 |
拡張検索 | 「BUN/Cr比」「TACBUN」「BUN定量法」 |
関連記事 | 「B」 |
C
※国試ナビ4※ [110D008]←[国試_110]→[110D010]
ACD
※国試ナビ4※ [109G038]←[国試_109]→[109G040]
・BUN
■電解質 | ||||
ナトリウム | Na | 135-147 | 140 | mEq/l |
カリウム | K | 3.7-4.8 | 4 | mEq/l |
塩素 | Cl | 99-106 | 103 | mEq/l |
カルシウム | Ca | 8.6-10.2 | 9.5 | mg/dl |
リン | P | 2.5-4.5 | 3.5 | mg/dl |
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