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Liver Function Tests:- Part 1 – Liver function tests and Jaundice Classification

January 10, 2023Chemical pathologyLab Tests

Table of Contents

  • Liver Function Tests
      • Sample for Liver Function Tests
      • For the complete evaluation of liver functions, the following tests are recommended.
      • Normal Values of liver function tests:
    • Phases of the Jaundice:
    • Classification of jaundice:
      • Questions and answers:

Liver Function Tests

Sample for Liver Function Tests

  • The venous blood is needed to prepare the serum.

For the complete evaluation of liver functions, the following tests are recommended.

    1. Total Bilirubin.
      1. Direct bilirubin.
      2. Indirect bilirubin.
    2. SGPT.
    3. SGOT.
    4. Alkaline phosphatase.
    5. Gamma-glutamyltransferase (γ-GT).
    6. Total protein.
    7. Albumin
    8. A / G ratio.
    9. Prothrombin time (PT).
    10. Ultrasound of the abdomen to evaluate the liver or any other mass in the abdomen.
    11. Viral markers.

Normal Values of liver function tests:

Test Normal value
Total bilirubin o.3 to 1.0 mg/dL
Conjugated bilirubin 0.1 to 0.3 mg/dL
Unconjugated bilirubin 0.1 to 0.8 mg/dL
Newborn total bilirubin 1.0 to 12.0 mg/dL.
Alkaline phosphatase

Adult = 30 to 120 units/L

Child <2 years = 85 to 235 units/L

2 to 8 years = 65 to 210 units/L

9 to 15 years = 60 to 300 units/L

16 to 21 years = 30 to 200 units/L

SGOT  (AST)

Adult = 0 to 35 units

Elderly = values slightly higher than adult

Newborn and infants = 15 to 60 units/L

SGPT (ALT)

Adult and child = 4 to 40 units/L

Infants may be twice high as the adult value

 Albumin

Adult = 3.5 to 5 g/dL

Premature infants = 3 to 4.2 g/dL

Newborn = 3.5 to 5.5 g/dL

Infant = 4.4 to 5.4 g/dL

Child = 4 to 5.9 g/dL

Total protein 6.4 to 8.3 g/dL
 A/G ratio  0.8 to 2.0
Gamma-glutamyltransferase (γ-GT).

>45 years = 8 to 38 units/L

Female <45 years = 5 to 27 units/L

Childlike adult level

Newborn = 5 times higher than the adult level

Prothrombin time (PT)

11 to 12.5 seconds

Anticoagulant therapy = 1.5 to 2 times control

Ultrasound No organomegaly
Viral markers Negative

Phases of the Jaundice:

  1. Preicteric phase.
  2. Icteric phase.
  3. Nonicteric phase.

Preicteric phase:

  1. In this phase, urine, bilirubin is usually positive 1 to 6 days before the onset of clinical jaundice.
  2. Urinary urobilinogen is usually increased.
  3. The BSP test is usually the first test to become positive in this phase.
  4. Thymol flocculation, turbidity tests, and cephalin flocculation tests are positive in the late phase of jaundice.

Icteric phase:

  1. Direct bilirubin is increased.
  2. Urinary urobilinogen is increased, and bile is present in the urine.
  3. Alkaline phosphatase may or may not be elevated.
  4. Thymol turbidity and flocculation test and cephalin-flocculation test are positive.
  5. The Bromsulphalein test is not helpful.

Nonicteric  phase:

  1. Urinary urobilinogen is increased.
  2. Thymol-flocculation and turbidity and cephalin flocculation tests are usually positive.
  3. The Albumin-globulin ratio shows high globulin and low serum albumin.
  4. Alkaline phosphatase and cholesterol ester may or may not be helpful.
Liver Function Tests: Jaundice and its phases

Liver Function Tests: Jaundice and its phases

Classification of jaundice:

The major causes of jaundice are:

  1. Pre-hepatic jaundice where there is hemolysis.
  2. Hepatic jaundice where there is intrahepatic biliary tract obstruction.
  3. Post hepatic jaundice where there is extrahepatic biliary tract obstruction.
Liver Function Tests: Classification of the jaundice

Liver Function Tests: Classification of the jaundice

  • Please see more details in the LFT part.

Questions and answers:

Question 1: What is the value of GGT?
Show answer
GGT is raised only in liver cell injury. It helps to differentiate from raised alkaline phosphatase from bone or liver.
Question 2: Which bilirubin will raise in obstructive jaundice?
Show answer
There is conjugated hyperbilirubinemia.

 


Possible References Used
Go Back to Chemical pathology

Comments

MUMTAZ AHMED Reply
October 6, 2022

I am very thankful to you for sharing this type of informatic site for us thank you so much sir

Dr. Riaz Reply
October 6, 2022

Thanks.

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