Cirrhosis

Diagnosis

Indications for Testing 

• Assess presence of fibrosis in patients with known liver disease or newly discovered disease

Laboratory Testing

• Serum testing (noninvasive)
  • Indirect markers
    • Main initial markers – aspartate aminotransferase (AST), alanine aminotransferase (ALT), platelet count, prothrombin time (PT)
      • Imprecise – when abnormal, frequently indicates decompensation
      • Albumin, PT, bilirubin, alpha-2 macroglobulin, and platelets may all be abnormal
  • Combination of indirect markers in panels may be more helpful
    • • AST platelet ratio index (APRI)
        • APRI = (AST/upper limit normal) x 100/platelet count
        • Score <0.5 excludes fibrosis
        • Score >2 suggests fibrosis
      • FibroIndex
        • FibroIndex = 1.738-0.064 x platelets + 0.005 x AST (IUs) + 0.463 x gammaglobulin
        • Less accurate than FibroSURE™
      • FibroMeter – platelet count, prothrombin, AST, alpha macroglobulin
      • FIB4 = age (years) x AST (IUs)/platelets x 10⁹/L x ALT (IUs)
      • FibroSURE™/FibroTest
        • Uses alpha-2 macroglobulin, haptoglobin, apolipoprotein A-1, total bilirubin, GGT (gamma glutamyl transpeptidase), and ALT
        • Interpreted according to value range and given a METAVIR and Ishak score for cirrhosis
      • ActiTest – adds ALT into FibroTest
      • FibroSpect
        • Uses hyaluronic acid, TMP-1, and alpha-2 macroglobulin
        • Performance has not been measured against FibroSURE^™ or FibroMeter
      • Forns index
        • Uses age, platelet count, AST, cholesterol
      • Hepascore
        • Uses age, sex, bilirubin, GGT, alpha-2 macroglobulin, hyaluronic acid
        • <0.5 – extensive fibrosis
        • >0.84 – excludes fibrosis
        • Lower sensitivity than FibroSURE™ or FibroMeter
      • Nonalcoholic fatty liver disease (NAFLD) fibrosis score
        • Uses age, diabetes mellitus, BMI, AST/ALT ratio, platelet count, albumin
      • Sequential algorithm for fibrosis evaluation (SAFE)
        • Combines APRI and FibroSURE™/FibroTest
  • Direct markers
    • Multiple biomarkers exist – most have relatively low specificity and sensitivity if used alone
      • Sensitivity and specificity based on disease process involved in fibrosis
      • No evidence to support use of collagen or metalloprotease measurements
    • Hyaluronic acid
      • Unsulfated, highly-polymerized glycosaminoglycan
      • Endogenous ligand for toll-like receptor of Kupffer cells
      • Synthesized by activated hepatic stellate cells
      • Most useful in nonalcoholic liver fibrosis
      • Negative predictive value is 93-99%
        • <55 µg/L excludes patients unlikely to have extensive fibrosis or cirrhosis
      • May avoid or postpone need for liver biopsy
      • Has been combined in panel testing with other markers in attempts to improve sensitivity (Fibrospect, HepaScore)

Histology

• Liver biopsy (invasive)
  • Remains important in cases with diagnostic uncertainty with coexisting disorders (HIV and hepatitis C), overlapping syndromes (primary biliary cirrhosis and autoimmune hepatitis), when there is an absolute necessity for diagnosis
  • Considered gold standard for diagnosis of fibrosis
  • Recommended sample size – at least 15 mm long and containing >5 portal tracts
  • Limitations – costly, painful, subject to sampling error (identifies hepatic disease in only 65-75%), morbidity (0.3%), mortality (0.01%)

Imaging Studies

• Not recommended in diagnosis of fibrosis; may be helpful if uncertain of diagnosis
  • Ultrasound – may help in diagnosis of NAFLD
  • FibroScan^® measures liver stiffness (transient elastography)
    • Uses mild-amplitude, low-frequency vibration
    • Wave travels faster through stiffer lines (fibrosis)
  • Magnetic resonance elastography
    • Same principal as FibroScan^®

Clinical Background

Chronic liver disease is a common problem worldwide.

Epidemiology

• Prevalence
  • Chronic viral hepatitis (B or C) infection – leading cause of chronic liver disease, affects >4 million people in the U.S.
  • Alcohol-related liver disease results in >12,000 deaths annually in U.S.
• Age – unusual in patients <40 years unless in combination with a genetic disease associated with cirrhosis
• Sex – M>F

Etiology

• Infectious – viral, parasitic, bacterial
• Chemical/toxin – alcohol, drugs (eg, methotrexate, amiodarone, methyldopa)
• Autoimmune disorders – autoimmune hepatitis, primary biliary cirrhosis
• Genetic – Wilson disease, hemochromatosis, alpha-1-antitrypsin deficiency

Pathophysiology

• Chronic liver inflammation leads to an increase in interstitial fibrous tissue
• Widespread disruption and secondary attempts at repair by the liver cause irreversible histologic changes leading to cirrhosis

Clinical Presentation

• May be asymptomatic until late-stage disease
• Hepatocellular dysfunction – jaundice, hepatomegaly
• Portal hypertension – varices, splenomegaly, ascites, palmar erythema, spider angiomata

Indications for Laboratory Testing

• Tests generally appear in the order most useful for common clinical situations
• Click on number for test-specific information in the ARUP Laboratory Test Directory

Click the plus sign to expand the table of additional tests.

Test Name and Number	Comments
Haptoglobin 0050280 Method: Quantitative Immunoturbidimetry	Use to calculate indirect marker index
Cholesterol, Serum or Plasma 0020031 Method: Quantitative Enzymatic	Use to calculate indirect marker index