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Good Positive and Negative Likelihood Ratios

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Hypocalcemia: Likelihood Ratios

Introduction: None written.

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Tags: Metabolic Tag this Diagnosis.

The likelihood ratios of findings for Hypocalcemia are listed below. See the left navigation bar to change the display.

Pre-Test Probability (Prevalence): %.	Post-Test Probability (Predictive Value): %.	Switch to display mode.
Note that calculating probabilities from more than one** finding is inherently inaccurate because findings are not independent. (For example, using two positive findings that share a common pathogenesis is likely to overestimate the true probability.)

Good Positive and Negative Likelihood Ratios
Finding	Result	+LR	-LR
[ + ] Trousseau's Sign	+ 0 -	94	0.1
"Most simply described, Trousseau’s sign presents as carpopedal spasm occurring after a few minutes of inflation of a sphygmomanometer cuff above systolic blood pressure. Occlusion of the brachial artery causes flexion of the wrist and metacarpophalangeal joints, hyperextension of the fingers, and flexion of the thumb on the palm, producing the characteristic posture called main d’accoucheur." Study: http://www.jcomjournal.com/pdf/hp_mar00_hypocal.pdf

Poorly Diagnostic Findings
Finding	Result	+LR	-LR
[ + ] Chvostek's Sign	+ 0 -	1.2	0.9
"The most well-known version of the sign, or the Chvostek I phenomenon, is described as twitching and/or contracture of the facial muscles produced by tapping on the facial nerve at a specific point on the face. This point is located 0.5 to 1 cm below the zygomatic process of the temporal bone, 2 cm anterior to the ear lobe, and on a line with the angle of the mandible." Study: http://www.jcomjournal.com/pdf/hp_mar00_hypocal.pdf