胆红素代谢
Unconjugated bilirubin
Urobilinogen
+ glucuronic acid Hepatocyte
Conjugated bilirubin Urobilinogen
kidney
Biliary system
Bacterial protease
Urobilinogen exert into urine
血清
三、胆红素(Bilirubin)代谢检查
游离胆红素 /非结合胆红素 /间接胆红素 ——脂溶性,有毒 结合胆红素 /直接胆红素 ——水溶性,Unconjugated Bilirubin/Indirect acting Bilirubin)
葡萄糖醛酸
(Conjugated Bilirubin/Direct acting Bilirubin )
Urine UCB BIL + URO
< 1︰20
CB 0~6.8
Normal /↑
Stool color
yellow brown
1.7~17.1 ↑ ↑↑
1.7~10.2 ↑↑↑ ↑↑
↑↑ ↑ ↑/N/↓
darken Pale
↑↑
↑↑↑
↑↑↑
Normal /↑
++
↓/-
white
CB/TB=(0.2-0.5)/1 正常比值,或肝细胞性黄疸
总胆红素
(Total bilirubin,TB/TBIL = UB + CB )
结合胆红素 test
总胆红素 test
Diazo reagent
CB reacting
alcohol Diazo reagent
CB+UB reacting
Urine Urobilirubin The ↑ of urobilirubin is always in parallel (尿胆红素) with ↑ of serum CB Urobilinogen Urobilin (尿胆素) (尿胆原,URO)
Feces Stercobilinogen Stercobilin
responsible for the coloration of feces and urine, respectively
(粪胆原)
(粪胆素)
要求掌握胆红素的化学反应分类
Unconjugated bilirubin
+ Albumin Blood
Portal vein 10%
Urobilinogen
Small intestine
Conjugated bilirubin
90%
feces
临床意义
Serum(μmol/l) TB
Normal Hemolytic jaundice Hepatic cell jaundice Obstructive jaundice
CB/TB>0.5 阻塞性黄疸可能
CB/TB<0.2 肝细胞前性黄疸(溶血性黄疸)可能