title: Sensitivity and specificity of fluid-blood levels for coagulopathy in acute intracerebral hematomas.
abstract: OBJECTIVE
  To characterize the imaging features of intracerebral hemorrhages in coagulopathies that alter prothrombin time or partial thromboplastin time.
  
  
  METHODS
  A fluid-blood level was defined as a horizontal interface between hypodense bloody serum layered above hyperdense settled blood. The prevalence of fluid-blood levels in acute intracerebral hemorrhages was determined on third-generation CT scans in 32 patients with elevation in prothrombin time or partial thromboplastin time. This was compared with the frequency of fluid-blood levels in 185 patients with intracerebral hemorrhage in which there was no laboratory evidence of coagulopathy.
  
  
  RESULTS
  The probability of finding a fluid-blood level in an intracerebral hemorrhage of a patient with abnormal prothrombin time or partial thromboplastin time was 59% (sensitivity). The probability that there will be no fluid-blood level in a patient with a normal prothrombin time and partial thromboplastin time was 98% (specificity).
  
  
  CONCLUSIONS
  Fluid-blood levels in acute intracerebral hemorrhage are moderately sensitive to the presence of coagulopathy (ie, abnormal prothrombin time and partial thromboplastin time) and highly specific for this condition. Thus, an intracerebral hemorrhage with a fluid-blood level should prompt a thorough search for coagulopathy because early treatment of this condition may improve the 40% mortality in these patients. Caution should be used to distinguish the horizontal interface of a fluid-blood level from a clot with a flat top. A decubitus CT is useful in these rare instances.
authors.affiliation: Department of Radiology, Baylor College of Medicine, Houston, TX 77030.
authors.forename: M J
authors.initials: MJ
authors.lastname: Pfleger
authors.forename: E P
authors.initials: EP
authors.lastname: Hardee
authors.forename: C F
authors.initials: CF
authors.lastname: Contant
authors.forename: L A
authors.initials: LA
authors.lastname: Hayman
mesh_terms: D000368:Aged; D000925:Anticoagulants / Q000008:administration & dosage / Q000009:adverse effects; D001778:Blood Coagulation Disorders / Q000097:blood / Q000139:chemically induced / Q000000981:diagnostic imaging*; D001780:Blood Coagulation Tests; D001812:Blood-Brain Barrier / Q000502:physiology*; D002543:Cerebral Hemorrhage / Q000097:blood / Q000139:chemically induced / Q000000981:diagnostic imaging*; D005260:Female; D006406:Hematoma / Q000097:blood / Q000139:chemically induced / Q000000981:diagnostic imaging*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011859:Radiography
chemical_list: D000925:Anticoagulants