title: Pathology consultation on human chorionic gonadotropin testing for pregnancy assessment.
abstract: OBJECTIVE
  To provide clarity on the use of qualitative and quantitative human chorionic gonadotropin (hCG) tests for the assessment of pregnancy.
  
  
  METHODS
  A case scenario and a brief review of the relevant literature describing clinical and analytical considerations regarding hCG testing are presented.
  
  
  RESULTS
  In pregnancy, hCG is nearly always detectable in serum and urine within 16 days after ovulation. Serial hCG testing is valuable in the evaluation of suspected ectopic pregnancy. hCG assays vary in their analytical specificity, and qualitative tests may be less analytically sensitive than claimed. Erroneous hCG test results can occur for several reasons.
  
  
  CONCLUSIONS
  hCG assays are reliable diagnostic tests for pregnancy assessment, but a clear understanding of their limitations is necessary for appropriate result interpretation.
authors.affiliation: From the Department of Laboratory Medicine, University of Washington, Seattle; and.
authors.forename: Dina N
authors.initials: DN
authors.lastname: Greene
authors.forename: David G
authors.initials: DG
authors.lastname: Grenache
mesh_terms: D000328:Adult; D006063:Chorionic Gonadotropin / Q000097:blood*; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D011247:Pregnancy / Q000097:blood*; D011258:Pregnancy Tests / Q000592:standards*; D012017:Referral and Consultation; D012680:Sensitivity and Specificity
chemical_list: D006063:Chorionic Gonadotropin
keywords: Clinical chemistry; Pregnancy; Reproductive biochemistry; hCG