MDCalc » General http://www.mdcalc.com click, diagnose, treat. Sun, 21 Mar 2010 00:42:53 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Modified Centor Score for Strep Pharyngitis http://www.mdcalc.com/modified-centor-score-for-strep-pharyngitis http://www.mdcalc.com/modified-centor-score-for-strep-pharyngitis#comments Fri, 02 Jan 2009 04:31:52 +0000 admin http://localhost:8888/mdcalc/wordpress/?p=104
Patient Age Range (not valid for <2) 3-14 years old +1
15-44 years old 0
≥ 45 years old -1
Exudate or Swelling on Tonsils? Yes +1
Tender/swollen anterior cervical lymph nodes? Yes +1
Fever? (T > 38° C, 100.4° F) Yes +1
Absence of Cough? Yes +1
Probability of Strep Pharyngitis
]]> http://www.mdcalc.com/modified-centor-score-for-strep-pharyngitis/feed 1 Bayesian Sensitivty, Specificity, Probabilities http://www.mdcalc.com/bayesian-sensitivty-specificity-probabilities http://www.mdcalc.com/bayesian-sensitivty-specificity-probabilities#comments Fri, 02 Jan 2009 04:28:45 +0000 admin http://localhost:8888/mdcalc/wordpress/?p=97 Pre-Test Odds, then Pre-Test Odds * LR Sensitivity = TP / (TP + FN) [...]]]>
Pre-Test Probability %
Prevalence (0-100%) %
Sensitivity (0-100%) %
Specificity (0-100%) %
Post-Test Probability %
Positive Predictive Value %
Negative Predictive Value %
Positive Likelihood Ratio
Negative Likelihood Ratio

Post-Test Odds: Convert Pre-Test Probability -> Pre-Test Odds, then Pre-Test Odds * LR

  • Sensitivity = TP / (TP + FN)
  • Specificity = TN / (FP + TN)
  • Prevalence = (TP + FN) / (TP + TN + FP + FN)
  • PPV (Positive Predictive Value) = TP / (TP + FP)
  • NPV (Negative Predictive Value) = TN / (FN + TN)
  • Positive Likelihood Ratio= SENS / ( 1-SPEC )
  • Negative Likelihood Ratio=( 1-SENS ) / SPEC
]]> http://www.mdcalc.com/bayesian-sensitivty-specificity-probabilities/feed 0 Endotracheal Tube (ETT) Size for Pediatrics http://www.mdcalc.com/endotracheal-tube-ett-size-for-pediatrics http://www.mdcalc.com/endotracheal-tube-ett-size-for-pediatrics#comments Fri, 02 Jan 2009 03:50:43 +0000 admin http://localhost:8888/mdcalc/wordpress/?p=58
Patient Age years old
Predicted Uncuffed Tube mm tube
Predicted Cuffed Tube mm tube
16 years old or older usually is sufficient for adult sizes.

Predicted Size Uncuffed Tube = (Age / 4) + 4

Predicted Size Cuffed Tube = (Age / 4) + 3

Estimate Intubation Tube Size for Children.

]]> http://www.mdcalc.com/endotracheal-tube-ett-size-for-pediatrics/feed 0 BMI and Body Surface Area (BSA) http://www.mdcalc.com/bmi-and-body-surface-area-bsa http://www.mdcalc.com/bmi-and-body-surface-area-bsa#comments Fri, 02 Jan 2009 03:37:53 +0000 admin http://localhost:8888/mdcalc/wordpress/?p=29
Weight lbs
Height inches
BMI: kg/m2
Body Surface Area: m2

BMI = Weight in kg / Height in meters2
Body Surface Area (The Mosteller formula) = ( ( Height(cm) x Weight(kg) ) / 3600 )1/2

]]> http://www.mdcalc.com/bmi-and-body-surface-area-bsa/feed 0 Age http://www.mdcalc.com/age http://www.mdcalc.com/age#comments Fri, 02 Jan 2009 03:29:42 +0000 admin http://localhost:8888/mdcalc/wordpress/?p=14
Birth Month
Birth Day
Birth Year
Age years old

(You're in trouble if you need a formula for this.)

]]> http://www.mdcalc.com/age/feed 0