Gastroenterology
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Hepatitis labs | AST/ALT very high (20x nml) early; WBC nml to low; TBil follows AST/ALT; alkphos parallels bili
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ALT/AST in infxs hep: | Usu ALT:AST > 1.0
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ALT/AST in EtOH hepatitis: | AST:ALT >1.0
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Hepatitis: urine labs: | mild proteinuria; bilirubinuria often precedes jaundice; may be incidental indicator of liver injury
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Hep: liver not primary target in: | EBV, CMV, other (HSV, yellow fever, mumps, rubella)
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Hepatitis: liver is primary target in: | hepatitis viruses
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Hepatitis serum tests | Immuno detection (EIA, RIA, RIBA, PCR); bx not for dx but useful for staging Hep C
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Most common cause of chronic hep | viral
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Most common PREVENTABLE infxs dz | Hep A
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Dx of acute infxs hep is by presence of: | IgM anti-HAV: indicates previous exposure to HAV, noninfectivity & immunity; past exposure common in US (30%); Total anti-HAV to screen ppl who may need vax
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Hep B: more likely to become chronic if: | young at age of infxn (or immunocompromised); 95% of pts clear the virus & develop Abs; chronic Hep B increases risk of cirrhosis & HCC
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First evidence of hep B infxn (persists throughout clinical illness): | HBsAg
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Appears after clearance of HBsAg or successful vax vs Hep B | Anti-HBs;
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Detection of Anti-HBs indicates: | recovery from HBV infxn, noninfectivity & immunity
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Anti-HBc IgM | Appears soon after HBsAg, before anti-HBs; presence w/ acute hep sx = acute Hep B; Persists 3-6 mos
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Anti-HBc IgG | Appears with Anti-HBc IgM, but persists
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HBcAg: | does not appear in serum
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HBeAg: | Secretory form of HBcAg; found only in HBsAg positive serum soon after its detection; Presence indicates viral replication & infectivity
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Anti-HBe: Presence (after clearance of HBeAg) indicates: | less viral replication & infectivity
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Hep B immunity (types) | Recovered from infxn: Anti-HBs pos, Anti-HBc IgG pos; vax: Anti-HBs pos, Anti-HBc IgG NEG
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HBV DNA | Parallels HBeAg, but is more sensitive/ precise marker of viral replication & infectivity; Low levels may persist in serum & liver after recovery from acute Hep B; HBV DNA in serum is bound to IgG & rarely infectious
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Hep C characteristics | high rate of chronic infxn (85%); cause of cryoglobulinemia; Dx: anti-HCV by ELISA, may need confirm w/HCV RNA & anti-HCV RIBA; Ab levels rise slowly
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Only test for Hep D if: | if pt has confirmed & unexplained worsening of Hep B
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Hep D characteristics | Requires HBsAg; worsens Hep B prognosis, inc risk of liver ca; Dx anti-HDV or HDV RNA in serum
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Hep E characteristics | Usu benign & self-limited; rare; 10-20% mortality in PG; Dx anti-HEV
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DUMC acute hep panel | HCV Ab; HBc IgM; HBs Ag; HAV IgM Ab
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"window period" = | serologic gap between the time HBSAg clears and antibody (HBS-Ag) becomes detectable
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IgG Ab in presence of HBSAg indicates: | chronic infection (in the absence of HBSAg = recovery)
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Fibrosure = | 6 biochemical marker test for HCV; correlates well with liver bx
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acute hep B eval | 1-4 mo incubation; 70% subclinical; ALT/AST 1000-2000
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HCV infxn sources | IVDU (most common); sex; bloodborne
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Hepatitis labs | AST/ALT very high (20x nml) early; WBC nml to low; TBil follows AST/ALT; alkphos parallels bili
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Hepatitis: urine labs: | mild proteinuria; bilirubinuria often precedes jaundice; may be incidental indicator of liver injury
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Most common cause of chronic hepatitis | viral hepatitis
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IgM anti-HAV signifies: | prior exposure to HAV, noninfectivity & immunity; past exposure common in US (30%); Total anti-HAV to screen ppl who may need vax
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Hep B: more likely to become chronic if: | young at age of infxn (or immunocompromised); 95% of pts clear the virus & develop Abs; chronic Hep B increases risk of cirrhosis & HCC
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First serologic evidence of hep B infection = | HBsAg (persists throughout clinical illness)
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Appears after clearance of HBsAg or successful vax vs Hep B | Anti-HBs
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Anti-HBs detection signals: | recovery from HBV infxn, noninfectivity & immunity
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Anti-HBc IgM appears when? | soon after HBsAg, before anti-HBs; presence w/ acute hep sx = acute Hep B; Persists 3-6 mos
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Anti-HBc IgG appears when? | Appears with Anti-HBc IgM, but persists
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HBcAg does not: | appear in serum
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HBeAg = | Secretory form of HBcAg; found only in HBsAg positive serum soon after its detection; presence indicates viral replication & infectivity
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Anti-HBe: Presence indicates: | less viral replication & infectivity
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Hep B immunity (types) | Recovered from infxn: Anti-HBs pos, Anti-HBc IgG pos; Vax: Anti-HBs pos, Anti-HBc IgG NEG
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HBV DNA | Parallels HBeAg, but is more sensitive/ precise marker of viral replication & infectivity; Low levels may persist in serum & liver after recovery from acute Hep B; HBV DNA in serum is bound to IgG & rarely infectious
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Hep C | high rate of chronic infxn (85%); cause of cryoglobulinemia; Dx: anti-HCV by ELISA, may need confirm w/HCV RNA & anti-HCV RIBA; Ab levels rise slowly
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Only test for Hep D if: | if pt has confirmed & unexplained worsening of Hep B
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Hep D: | Requires HBsAg; worsens Hep B prognosis, inc risk of liver ca; Dx anti-HDV or HDV RNA in serum
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Hep E | Usu benign & self-limited; rare; 10-20% mortality in PG; Dx anti-HEV
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chronic hepatitis panel | HBCAb IgG, HBCAb IgM, HBSAg, HbSAb
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Hep B: past infxn vs vax | PAST INFXN: pos HBSAb, HBCAb; neg HBSAg, HBeAg, var HBeAb. VAX: pos HBSAb, all others neg
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Hep B labs: infectivity | HbeAg: infective; HbeAb: not actively infective; HBV DNA: Marker of ongoing infection
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Created by:
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