B-hCG (quantitative)
CBC and BMP
Coags
T&S (Rh) vs. T&C
Urinalysis
Pelvic ultrasound
By ultrasound finding:
+IUP = threatened abortion
Ectopic ruled-out unless on fertility drugs
Empty uterus + free fluid/adnexal mass = Ectopic
Empty uterus + no free fluid / no mass
Beta-HCG:
>1,500 = Presumed ectopic
<1,500 = Indeterminate: follow serial B-HCG levels in 48hrs (if no peritonitis)
Increased >66% = normal IUP
Increased <66% = Ectopic
+IUP = threatened abortion
Ectopic ruled-out unless on fertility drugs
Empty uterus + free fluid/adnexal mass = Ectopic
Empty uterus + no free fluid / no mass
Beta-HCG:
>1,500 = Presumed ectopic
<1,500 = Indeterminate: follow serial B-HCG levels in 48hrs (if no peritonitis)
Increased >66% = normal IUP
Increased <66% = Ectopic
Ectopic ruled-out unless on fertility drugs
Beta-HCG:
>1,500 = Presumed ectopic
<1,500 = Indeterminate: follow serial B-HCG levels in 48hrs (if no peritonitis)
Increased >66% = normal IUP
Increased <66% = Ectopic
>1,500 = Presumed ectopic
<1,500 = Indeterminate: follow serial B-HCG levels in 48hrs (if no peritonitis)
Increased >66% = normal IUP
Increased <66% = Ectopic
Increased >66% = normal IUP
Increased <66% = Ectopic
Values are for IUP visualization, not ectopic visualization
Pelvic Ultrasound: hCG >1500
Abd Ultrasound: hCG >3000
Vaginal bleeding in pregnancy 
Ectopic pregnancy
Abdominal pain in pregnancy
Subchorionic hematoma
Comorbid diseases in pregnancy
First Trimester Abortion
Nonpregnant vaginal bleeding
Complete Abortion