Exam 1 - Sensitivity and Specificity/Partial Electrolyte
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Clinical Sensitivity | True Positive / (True Positive + False Negative)
Sensitivity = True Positives / All "real" positives
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| Clinical Specificity | True Negative / (True Negative + False Negative)
Specificity = True Negative / All "real" negatives
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| Predictive Value - Positive Test (txtbook) | True Positive / (True Positive + False Positive)
PV (+) = True Positive / All positive results
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| Predicitive Value - Negative Test | True Negative / (True Negative + False Negative)
PV (=) = True Negative / All negative results
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| 2 Standard Deviations (within 2 SD) | 95.5% of all values; most important range
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| 3 Standard Deviations (within 3 SD) | 99.9% of all values
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| 1 Standard Deviation (within 1 SD) | 68.3 % of all values
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| Prevalence | (True Positive + False Negative) / [(True Positive + False Positive) + (True Negative + False Negative)]
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| Major Electrolytes | Na+, K+, Cl-, CO3- etc
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| Percent Magnesium Unbound | 70%
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| Percent Ca++ Unbound | 45% free/ionized - sensitive to blood pH
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| Anion Gap Equation | AG = ([Na+] +[K+]) - ([Cl-]+ [HCO3-])
*Note: HCO3- = 90% of CO2
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| Osmolality Equation | 1.86 [Na+] + Glucose/18 + BUN/2.8 + 9
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| Glomerular Filtration Rate Equation (ml/min) | [Urine Creatinine (mg/dl) * V (ml/24h) * 1.73]/[Serum Creatinine (mg/dl) * (1440/24) * SA]
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