Carcinoid Tumor: Likelihood Ratios

Introduction: None written.

The likelihood ratios of findings for Carcinoid Tumor 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
[ + ] 5-HIAA, Urine	+ 0 -	inf	0.3
The most useful initial diagnostic test in patients with suspected carcinoid syndrome is to measure 24-hour urinary excretion of HIAA, which is the end product of serotonin metabolism. (UpToDate) Study: Urinary serotonin in the diagnosis of carcinoid tumors. Feldman JM Clin Chem 1986 May;32(5):840-4. PMID 2421946