1. Blood gas and electrolytes
2. Complete blood count (CBC)
3. Liver panel
4. Kidney function (creatinine)
5. Hepatitis B and C screening
6. Putting it together: differential diagnosis and next steps

• Blood gas and electrolytes: The patient has a severe metabolic acidosis with respiratory compensation: pH 7.166, HCO3 7, pCO2 19.8, base excess -19.8. Lactate is 15.88, which suggests severe tissue hypoperfusion or hypoxia. Other findings are low Na (131.3), low ionized Ca (0.93), high K (5.29) and high glucose (314). The report lists glucose in mmol/L, which is probably a unit labeling error because 314 would be mg/dL.
• CBC: The patient has profound anemia: Hb 39 g/L, RBC 1.34, Hct 13.1%. The MCV is normal (97.5) and the RDW is high (24.9). The WBC is raised at 15.41 with neutrophilia (87.8%) and lymphopenia. Platelets are high at 465.
• Liver panel: Total bilirubin is 233.9 (normal 2 to 21) and direct bilirubin is 110.6, so the jaundice is mixed. ALT is 400, AST is 332, GGT is 150 and ALP is 682. This is a mixed hepatocellular and cholestatic injury.
• Kidney function: Creatinine is 223 (normal 54 to 99), which indicates acute kidney injury or worsening chronic kidney disease.
• Hepatitis screen: HBsAg is positive and anti-HCV is negative. HBsAg positivity is a screening result and needs confirmation. It may mean chronic HBV, or an acute flare or reactivation.
• Differential diagnosis: Possible causes include sepsis with hemolysis or hemorrhage, a hepatobiliary cause such as cholangitis or a malignancy, decompensated HBV-related liver disease, and a hematologic cause. The Hb of 39 g/L alone would normally call for urgent transfusion work-up.

1. Blood gas and electrolytes
2. Complete blood count (CBC)
3. Liver panel
4. Kidney function (creatinine)
5. Hepatitis B and C screening
6. Putting it together: differential diagnosis and next steps

• Blood gas and electrolytes: The patient has a severe metabolic acidosis with respiratory compensation: pH 7.166, HCO3 7, pCO2 19.8, base excess -19.8. Lactate is 15.88, which suggests severe tissue hypoperfusion or hypoxia. Other findings are low Na (131.3), low ionized Ca (0.93), high K (5.29) and high glucose (314). The report lists glucose in mmol/L, which is probably a unit labeling error because 314 would be mg/dL.
• CBC: The patient has profound anemia: Hb 39 g/L, RBC 1.34, Hct 13.1%. The MCV is normal (97.5) and the RDW is high (24.9). The WBC is raised at 15.41 with neutrophilia (87.8%) and lymphopenia. Platelets are high at 465.
• Liver panel: Total bilirubin is 233.9 (normal 2 to 21) and direct bilirubin is 110.6, so the jaundice is mixed. ALT is 400, AST is 332, GGT is 150 and ALP is 682. This is a mixed hepatocellular and cholestatic injury.
• Kidney function: Creatinine is 223 (normal 54 to 99), which indicates acute kidney injury or worsening chronic kidney disease.
• Hepatitis screen: HBsAg is positive and anti-HCV is negative. HBsAg positivity is a screening result and needs confirmation. It may mean chronic HBV, or an acute flare or reactivation.
• Differential diagnosis: Possible causes include sepsis with hemolysis or hemorrhage, a hepatobiliary cause such as cholangitis or a malignancy, decompensated HBV-related liver disease, and a hematologic cause. The Hb of 39 g/L alone would normally call for urgent transfusion work-up.

How the results fit together

Differential, most to least likely

1. Biliary or hepatic sepsis with intravascular hemolysis. Examples are ascending cholangitis, a liver abscess, or Clostridium perfringens bacteremia. The combination of anemia, jaundice with high ALP and GGT, AKI, lactic acidosis and neutrophilia fits well.
   • Harrison's describes life-threatening intravascular hemolysis from a lecithinase toxin in C. perfringens sepsis (Harrison's Principles of Internal Medicine 22E, "Acquired Hemolytic Anemia").
   • Frameworks for Internal Medicine reports severe hemolysis in up to 15% of C. perfringens bacteremia, with mortality around 75% and median time to death about 10 hours (Frameworks for Internal Medicine, "Hemolytic anemia").
   • If hemolysis is confirmed, the pattern should prompt urgent anaerobic coverage and source control.
2. Acute blood loss anemia, for example GI bleeding, in a patient with HBV-related liver disease. This would give hypovolemic shock, lactate, AKI and a post-bleed reactive thrombocytosis. Check for melena or hematemesis, BUN and stool.
3. HBV flare or acute-on-chronic liver failure, or a hepatobiliary or pancreatic malignancy. This could be HCC, which can bleed or rupture, or cholangiocarcinoma or a pancreatic head tumor causing obstruction. Anemia and AKI would then be secondary.
4. Non-infectious hemolysis combined with liver disease. Examples are autoimmune hemolytic anemia (including lymphoma-associated), malaria (ask about travel), drug-induced or G6PD-related hemolysis, and Wilson disease (unlikely at 63 with a high ALP).
5. Mixed causes. Several of these can coexist, for example chronic HBV with cholangitis and bleeding.

Tests that would settle it

• Anemia work-up: peripheral smear (spherocytes, schistocytes, ghost cells, parasites), reticulocytes, LDH, haptoglobin, free hemoglobin, direct antiglobulin test, and urine for hemoglobin.
• Infection: at least two sets of blood cultures including anaerobic bottles, and a malaria film or rapid test if there is any exposure history.
• Source: urgent abdominal ultrasound or CT looking for biliary dilation, stones, liver abscess, mass or splenic pathology.
• Bleeding and coagulation: INR, aPTT, fibrinogen, BUN, stool check and endoscopy if indicated.
• Liver: ammonia, albumin, confirmatory HBsAg with HBV DNA, HBeAg, anti-HBc IgM and anti-HDV. Also AFP and the other viral markers.
• Acid-base and metabolic: ketones, repeat lactate, chloride and albumin to complete the anion gap.
• Blood bank: group and crossmatch early. Autoantibodies can delay compatible blood, so alert the lab.

Immediate management principles

• Resuscitation: treat as septic or hemorrhagic shock in a monitored setting, with early red cell transfusion given the Hb of 39 g/L.
• Antibiotics: broad-spectrum antibiotics with anaerobic coverage within the first hour if infection is suspected.
• Source control: early drainage of any obstructed biliary system or abscess.
• Kidney and acidosis: early nephrology involvement. Renal replacement therapy is considered for refractory acidosis, hyperkalemia or oliguria.
• HBV: antiviral therapy is decided with hepatology once HBV is confirmed. It is urgent if this is a flare or if immunosuppression is planned.

Limits of this assessment