Pregnancy Chart on False Test Results

pregnancy chart

Causes: False-positive Results: False-negative Results:
Human
  • Error in reading.
  • Error in recording
  • Error in reading.
  • Error in recording
Poor Test Sample or Condition
  • Recent pregnancy (for example, test done fewer than 10 days after abortion)
  • Proteinuria
  • Hematuria
  • Test performed during ovulation
  • Test performed too early or too late in pregnancy
  • Urine too dilute
  • Urine stored too long at room temperature.
Substance
  • Leutinizing hormone cross-reaction interference
  • Aspirin in large doses, phenothiazines (antipsychotic medications), marijuana, methyldopa (Aldomet)
  • Treatment with human chorionic gonadotropin (HCG) for infertility (affects blood tests only)
  • HCG secreted by tumor
  • (N/A as in menopause)
Other
  • Pregnancy recently terminated (within 10days of test)
  • Trophoblastic disease (molar pregnancy or choriocarcinoma)
  • Missed Abortion
  • Ectopic pregnancy
  • Impending spontaneous abortion

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