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A 21-year-old woman presented with a 5-day history of loss of appetite, malaise, nausea, and vomiting. On examination, she appeared acutely ill, with jaundice and right-sided hypochondrial tenderness. The stigmata of chronic liver disease were absent, and the results of her neurologic examination were typical. She had previously been well except for bouts of somnolence with occasional emesis during the previous year. There was no history of recent travel, alcohol or illicit drug use, or liver disease in her family. Viral hepatitis was considered the most likely diagnosis, but the patient's clinical deterioration necessitated hospital admission a day later. The results of serology tests for acute infection with hepatitis A virus, hepatitis B virus, or Epstein–Barr virus were negative, and the complete blood count revealed a macrocytic anemia. Liver function tests revealed the following: total bilirubin, 136 μmol/L [upper reference limit (URL),2 26 μmol/L]; direct bilirubin, 62 μmol/L (URL, 7 μmol/L); albumin, 31 g/L [reference interval (RI), 35–50 g/L]; γ-glutamyltransferase, 165 U/L (URL, 44 U/L); aspartate aminotransferase (AST), 166 U/L (URL, 35 U/L); alanine aminotransferase (ALT), 24 U/L (URL, 35 U/L). Serum alkaline phosphatase (ALP) was noteworthy for being undetectable (<5 U/L; RI, 51–117 U/L) on 3 consecutive days. Methodologic interference in the ALP assay by anticoagulants, such as EDTA and fluoride, was excluded on the basis of sodium, potassium, and calcium concentrations that were within reference intervals. Evidence of hemolysis was provided by the results for serum lactate dehydrogenase (786 U/L; RI, 120–230 U/L) and haptoglobin (<60 mg/L; RI, 300–2000 mg/L). The hemoglobin concentration decreased from 83 g/L to 35 g/L (RI, 124–167 g/L), requiring transfusion of 9 units of packed red blood cells. The patient also received 18 units of fresh frozen plasma during 4 plasma-exchange procedures. Although citrate chelation after transfusion of blood products may cause …

Undetectable Serum Alkaline Phosphatase Activity in a Patient with Fulminant Hepatic Failure and Hemolytic Anemia