[Diagnostic usefulness of intradermal test for clonorchiasis in patients with pancreatobiliary diseases].
OBJECTIVE
The diagnosis of clonorchiasis is based on demonstrating eggs in stool or bile. It is believed that bile examination is the most precise method for detecting eggs. We evaluated diagnostic usefulness of intradermal test (IDT) by comparing it with the result of bile examination.


METHODS
For 88 patients with pancreatobiliary diseases, we examined Clonorchis sinensis eggs in bile and performed IDT for clonorchiasis. The bile was obtained from endoscopic nasobiliary or percutaneous transhepatic biliary drainage tubes.


RESULTS
We calculated ROC curve to decide the cut-off value of IDT in determining diagnostic accuracy on the basis of bile examination. We chose a value of 40 mm2, which significantly improved the sensitivity, without reducing the specificity. With a cut-off value of 40 mm2, the sensitivity, specificity, positive and negative predictive values of IDT were 81.5%, 67.2%, 52.4%, and 89.1%, respectively. The value of IDT was not affected by age and showed no difference between benign and malignant diseases. However, in egg-positive patients, the mean value was lower in malignant diseases than in benign diseases.


CONCLUSIONS
In patients with pancreatobiliary diseases, IDT with a cut-off value of 40 mm2 seems to be a valuable supplementary diagnostic test for clonorchiasis in view of its high sensitivity.
Joo
Kwang Ro
KR
Department of Internal Medicine, University of Ulsan College of Medicine, Ulsan, Korea. gicolon@unitel.co.kr
Lee
Mi Suk
MS
Yun
Tae Guen
TG
Choo
Yeon Ik
YI
Lee
Jin Woo
JW
Jo
Young Chul
YC
Kim
Dae Hyun
DH
Kim
Do Ha
DH
Park
Neung Hwa
NH
Park
Jae Hoo
JH
D000368:Aged; D001646:Bile / Q000469:parasitology; D001660:Biliary Tract Diseases / Q000175:diagnosis*; D003003:Clonorchiasis / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007428:Intradermal Tests; D008297:Male; D008875:Middle Aged; D010182:Pancreatic Diseases / Q000175:diagnosis*; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity