Performance of human chorionic gonadotropin curves in women at risk for ectopic pregnancy: exceptions to the rules  Christopher B. Morse, B.A., Mary D. Sammel, Sc.D., Alka Shaunik, M.D., Lynne Allen-Taylor, Ph.D., Nicole L. Oberfoell, B.A., Peter Takacs, M.D., Ph.D., Karine Chung, M.D., M.S.C.E., Kurt T. Barnhart, M.D., M.S.C.E.  Fertility and Sterility  Volume 97, Issue 1, Pages 101-106.e2 (January 2012) DOI: 10.1016/j.fertnstert.2011.10.037 Copyright © 2012 American Society for Reproductive Medicine Terms and Conditions

Supplemental Figure 1 Cartoon of the logic of comparing actual value to that expected when following serial hCG concentrations in a women with a pregnancy of unknown location. (A) The minimal increase in hCG of 35% for intrauterine pregnancy (IUP) (blue line) and a hypothetical patient (red line) with initially appropriate, then abnormal, increase in hCG level. The “X” marks the time at which the increase is slower than anticipated and intervention may be necessary to rule out ectopic pregnancy (EP). (B) The minimal decrease in hCG for a completed miscarriage (spontaneous abortion, SAB) is depicted (blue line) and a hypothetical patient (green line) with initially appropriate, then abnormal, decrease in hCG level. The “X” marks the time at which the decline is slower than anticipated and intervention may be necessary to rule out EP. Fertility and Sterility 2012 97, 101-106.e2DOI: (10.1016/j.fertnstert.2011.10.037) Copyright © 2012 American Society for Reproductive Medicine Terms and Conditions