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Liver function tests ppt BIOCHEMISTRY

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Liver function tests ppt BIOCHEMISTRY

  1. 1. LIVER FUNCTION TESTS Dr. Vijay Marakala , M.B.B.S, M.D. BIOCHEMISTRY SIMS & RC
  2. 2. Functions of liver Classification of LFT
  3. 3. Metabolic function Excretory function Synthetic fuction Detoxification function Storage function FUNCTIONS OF LIVER
  4. 4. According to function of liver Classification of LFT Tests based on synthetic function Tests based on excretory function Tests based on detoxification function Tests based on metabolic function Determination of serum enzymes I II III IV V
  5. 5. 1.Serum bilirubin 2.Urine bilirubin 3.Urine and faecal urobilinogen 4.Urine bile salts 5.Dye excretion tests
  6. 6. Hippuric acid test Determination of blood ammonia
  7. 7. Plasma proteins Prothrombin time
  8. 8. Tests related to CARBOHYDRATE metabolism Tests related to LIPID metabolism Tests related to PROTEIN metabolism Galactose tolerance test Serum cholesterol Serum proteins Aminoaciduria
  9. 9. Serum transaminases ALT AST Serum alkaline phosphatase ALP
  10. 10. 1.Serum bilirubin 2.Urine bilirubin 3.Urine and faecal urobilinogen 4.Urine bile salts 5.Dye excretion tests
  11. 11. •Total, conjugated and unconjugated Serum-Bilirubin •Bile pigments, bile salts and urobilinogen urine
  12. 12. 1.Serum bilirubin Conjugated 0.0 – 0.4mg/dl Unconjugated 0.2 –0.8mg/dl Total 0.2 – 1mg/dl
  13. 13. • Serum bilirubin estimation is based on van den Berg’s diazo reaction. • Diazo reagent consists of diazotized sulfanic acid Determination of Serum Bilirubin •When a bilirubin in serum is allowed to react with a freshly prepared solution of VD Bergh’s diazo reagent, there will be formation of purple compound “azo- bilirubin Principle
  14. 14. URINE BILIRUBIN •In all cases of jaundice, urine should be examined for the presence of bile pigments (bilirubin), bile salts and urobilinogen •Fouchet’s test
  15. 15. URINE UROBILINOGEN • Urobilinogen absent in obstruction to bile flow • Ehrlich’s test
  16. 16. URINE BILE SALTS •Obstruction in the biliary passages •Hay’s test
  17. 17. Laboratory results S Bilirubin U Urobilinogen U Bilirubin F Urobilinoge Conjugated Unconjugated Normal 0.1- 0.4mg/dl 0.2-0.7mg/dl 0.4mg/day Absent 40- 280mg/day Prehepatic Normal Increased Increased Absent Increased Hepatic Increased Increased N/Decreased Present Decreased Posthepatic Increased Normal Absent Present Trace to absent
  18. 18. Dye excretion test Bromosulphthalein [BSP] test Nontoxic, almost exclusively excreted by the liver 5mg/kg body weight I.V Serum level at 45min and 2hours Less than 5% dye retained at the end of 45min
  19. 19. Hippuric acid test •6gm of sodium benzoate dissolved in 250ml water •Collect urine for next 4 hour Determination of blood ammonia •Liver detoxicates ammonia to form urea •Normal 40- 70µg/100ml Tests b/o detoxification function
  20. 20. Liver is the main source of synthesis of Plasma proteins - Albumin - Globulin(except γ) Blood clotting factors - Prothrombin and factors V, VII and X. Tests b/o synthetic function
  21. 21. Total serum protein = 6-8gm/dl Serum albumin = 3.5- 5.5gm/dl Serum globulin =2-3.5gm/dl Determination of serum albumin and globulin Albumin/globulin ratio = 1.2:1 to2.5:1
  22. 22. Prothrombin time depends upon the presence of prothrombin and factors V, VII and X. Deficiency causes prolonged time. Determination of Prothrombin time
  23. 23. Tests related to CARBOHYDRATE metabolism Tests related to LIPID metabolism Tests related to PROTEIN metabolism Tests b/o metabolic function Galactose tolerance test Serum cholesterol Serum proteins Aminoaciduria
  24. 24. • In liver cell injury, damage to the membrane of cells and organelles allows intracellular enzymes to leak into the blood. • Where their elevated concentrations can be measured Enzymes in diagnosis of liver disease Serum transaminases Serum alkaline phosphatase
  25. 25. Serum transaminases AST or SGOT=<35U/L ALT or SGPT=<40U/L S. alkaline phosphatase ALP= 3-13KA units/dl ALP is normally excreted through bile ↑↑↑In obstructive jaundice Enzymes in liver disease
  26. 26. Enzyme Prehepatic Jaundice Hepatic Jaundice Obstructive Jaundice ALT or AST Usually normal Marked increase 500-1500IU/L Increased 100-300IU/L ALP Normal Increased slightly < 30KA/dl Marked increase >30KA/dl Enzyme assays in differential diagnosis of Jaundice
  27. 27. •Normal range: 10-47IU/L Serum γ-Glutamyl Transferase •Normal range: 2-17IU/L Serum 5’-Nucleotidase •Normal range: 70-240IU/L Serum Lactate Dehydrogenase Other enzymes
  28. 28. Thank you

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