• Urine
  • OHIP defunded urine HCG, so used less commonly in office
  • Used more often at home (pee on a stick test at home)
  • Detection threshold is higher
• Serum
  • Quantitative info
  • Detection threshold is lower = more sensitive
  • As a one-off measurement, it is not helpful
    • Widely over-lapping
    • Threshold for US findings
  • 2 b-HCG 48hr apart (Trend) : expect to double (x 2)