Equations Flashcards
1
Q
Corrected serum calcium
A
corrected serum calcium= ((4-albumin) X 0.8) + measured serum calcium
2
Q
Number needed to treat
A
NNT= 1/ARR (absolute risk reduction)
3
Q
anion gap
A
Na - (Cl + HCO3)
number of unmeasured ions (normal is 10-14)
4
Q
Relative Risk Reduction
A
RRR= (1-Relative risk)
5
Q
Positive predictive value
A
PPV= TP/TP+FP
6
Q
negative predictive value
A
NPV= TN/TN+FN
7
Q
what factors or independent of prevelance in a study?
A
sensitivity, specificity, likelihood ratios
8
Q
Positive likelihood ratio
A
LR+= sensitivity/(1-specificity)
9
Q
Negative likelihood ratio
A
LR- = (1-sensitivity)/specificity
