Which of the following statements are false regarding serum beta-hCG levels?

A. A quantitative

beta-hCG level above the discriminatory zone and an empty uterus on pelvic ultrasound may represent either an ectopic pregnancy or a recent abortion

B. A single quantitative hCG level is insufficient to rule out a viable pregnancy, abortion, or ectopic pregnancy

C. Beta-hCG levels usually double in value every 48-72 hours in normal pregnancy

D. Can be used as a threshold for ordering a pelvic ultrasound in the emergency department

E. All of the above

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