• 1
    Kaplan B., Dart R., Moskos M., et al. Ectopic pregnancy:prospective study with improved diagnostic accuracy. Ann Emerg Med. 1996;28:107.
  • 2
    Barnhart K., Mennuti M., Benjamin I., Jacobson S., Goodman D., Cou-tifaris C. Prompt diagnosis of ectopic pregnancy in an emergency department setting. Obstet Gynecol. 1994;84:10105.
  • 3
    Nyberg D., Mack L., Laing F., Jeffrey R. Early pregnancy complications:endovaginal sonographic findings correlated with human chori-onic gonadotropin levels. Radiology. 1988;167:61922.
  • 4
    Dart R., Kaplan B., Cox C. Transvaginal ultrasonography in patients with low p-hCG values:how often is the study diagnostic Ann Emerg Med. 1997;30:13540.
  • 5
    Williams R., Gaines I., Fossum G. Progesterone in diagnosis of ectopic pregnancy. J Fla Med Assoc. 1992;79:2379.
  • 6
    Grosskinsky C., Hage M., Tyrey L., Christakos A., Hughes C. hCG, progesterone, alpha-fetoprotein, and estradiol in the identification of ectopic pregnancy. Obstet Gynecol. 1993;81:7059.
  • 7
    Radwanska E., Frankenberg J., Allen E. Plasma progesterone levels in normal and abnormal early human pregnancy. Fertil Steril. 1978;30:398402.
  • 8
    Matthews C., Coulson P., Wild R. Serum progesterone levels as an aid in the diagnosis of ectopic pregnancy. Obstet Gynecol. 1986;68:3904.
  • 9
    Stovall T., Ling F., Cope B., Buster JE. Preventing ruptured ectopic pregnancy with a single serum progesterone. Am J Obstet Gynecol. 1989;160:142531.
  • 10
    Nygren K., Johansson E., Wide L. Evaluation of threatened abortion from the peripheral plasma levels of progesterone, estradiol, and human chorionic gonadotropin. Am J Obstet Gynecol. 1973;116:91622.
  • 11
    Yeko T., Gorrill M., Hughes L., Rodi I., Buster J., Sauer M. Timely diagnosis of early ectopic pregnancy using a single blood progesterone measurement. Fertil Steril. 1987;48:104850.
  • 12
    Buck R., Joubert S., Norman R. Serum progesterone in ectopic pregnancy:a valuable diagnostic test Fertil Steril. 1988;50:7525.
  • 13
    Gelder M., Boots L., Younger J. Use of a single random serum progesterone value as a diagnostic aid for ectopic pregnancy. Fertil Steril. 1991;55:497500.
  • 14
    Stem J., Voss F., Coulam C. Early diagnosis of ectopic pregnancy using receiver-operator characteristic curves of serum progesterone concentrations. Hum Reprod. 1993;8:7759.
  • 15
    Stovall T., Ling F., Carson S., Buster J. Serum progesterone and uterine curettage in differential diagnosis of ectopic pregnancy. Fertil Steril. 1992;57:4568.
  • 16
    McCord M., Muram D., Buster J., Arheart K., Stovall T., Carson S. Single serum progesterone as a screen for ectopic pregnancy; exchanging specificity and sensitivity to obtain optimal test performance. Fertil Steril. 1996;66:5136.
  • 17
    Milwidsky A., Segal S., Menashe M., Adoni A., Palti Z. Corpus lu-teum function in ectopic pregnancy. Int J Fertil. 1984;29:2446.
  • 18
    Lindahl B., Ahlgren M. Identification of chorionic villi in abortion specimens. Obstet Gynecol. 1986;67:7981.
  • 19
    Kadar N., Romero R. Further observations on serial chorionic gonadotropin patterns in ectopic pregnancies and spontaneous abortions. Fertil Steril. 1988;50:36770.