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  3. Vol. 4 No. 1 (2016): Winter (February)
  4. Evidence-Based Emergency Medicine

Vol. 4 No. 1 (2016)

February 2016

Part 4: Pre and Post Test Probabilities and Fagan’s Nomogram

  • Saeed Safari
  • Alireza Baratloo
  • Mohamed Elfil
  • Ahmed Negida

Archives of Academic Emergency Medicine, Vol. 4 No. 1 (2016), 1 February 2016 , Page 48-51
https://doi.org/10.22037/aaem.v4i1.219 Published: 2018-12-11

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Abstract

Emergency physicians face numerous questions regarding proper management of patients and selection of the best laboratory test or imaging every day. Knowledge on screening performance characteristics of the diagnostic tools used in this department plays an important role in finding the answers to these questions. We assessed these characteristics in the previous parts of educational article series in Emergency journal. In the present manuscript, we will describe how to use these screening characteristics for selecting the right diagnostic tools.
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1.
Safari S, Baratloo A, Elfil M, Negida A. Part 4: Pre and Post Test Probabilities and Fagan’s Nomogram. Arch Acad Emerg Med [Internet]. 2018 Dec. 11 [cited 2025 Nov. 12];4(1):48-51. Available from: https://journals.sbmu.ac.ir/aaem/index.php/AAEM/article/view/219
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References

Baratloo A, Hosseini M, Negida A, El Ashal G. Part 1: Simple Definition and Calculation of Accuracy, Sensitivity and Specificity. Emergency. 2015;3(2):pp. 48-9.

Safari S, Baratloo A, Elfil M, Negida AS. Part 2: Positive and negative predictive values of diagnostic tests. EMERGENCY-An Academic Emergency Medicine Journal. 2015;3(3):87-8.

Baratloo A, Elfil M, Negida A. Part 3: Positive and Negative Likelihood Ratios of Diagnostic Tests. Emergency-An Academic Emergency Medicine journal. 2015;3(4):170-1.

Fulton LV, Mendez FA, Bastian ND, Musal RM. Confusion Between Odds and Probability, a Pandemic? Journal of Statistics Education. 2012;20(3):n3.

Wassertheil-Smoller S, Smoller J. A Little Bit of Probability. Biostatistics and Epidemiology: Springer; 2015. p. 17-25.

Bland JM, Altman DG. The odds ratio. Bmj. 2000;320(7247):1468.

Parikh R, Parikh S, Arun E, Thomas R. Likelihood ratios: clinical application in day-to-day practice. Indian journal of ophthalmology. 2009;57(3):217.

Haghighi SHO, Begi HRM, Sorkhabi R, Tarzamani MK, Zonouz GK, Mikaeilpour A, et al. Diagnostic Accuracy of Ultrasound in Detection of Traumatic Lens Dislocation. Emergency. 2014;2(3):pp. 121-4.

Akobeng AK. Understanding diagnostic tests 2: likelihood ratios, preâ€and postâ€test probabilities and their use in clinical practice. Acta Paediatrica. 2007;96(4):487-91.

Caraguel CG, Vanderstichel R. The two-step Fagan's nomogram: ad hoc interpretation of a diagnostic test result without calculation. Evidence Based Medicine. 2013;18(4):125-8.

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