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(Chest. 1973;64:687-689.)
© 1973 American College of Chest Physicians

Objective Assessment for Digital Clubbing in Caucasian, Negro, and Oriental Subjects

R. Michael Sly M.D.1; Simin Ghazanshahi M.D.1; Bhirom Buranakul M.D.1; Paiboon Puapan M.D.1; Sushma Gupta M.D.2; Robert Warren M.D.2; and William Waring M.D., F.C.C.P.2

1 Department of Pediatrics, Louisiana State University Medical Center, New Orleans
2 Department of Pediatrics, Tulane University School of Medicine, New Orleans

The ratio of the depth of the index finger at the base of the nail (DPD) divided by the depth at the distal interphalangeal joint (IPD) has been reported useful in evaluating subjects for the presence of digital clubbing. A ratio which exceeds 1 has been considered abnormal. This relationship was independent of age and sex. To determine whether the ratio of DPD/IPD was independent of race, measurements were made of casts of the index fingers of 80 normal subjects: 20 North American Caucasians, 20 Iranians, 20 Negroes, and 20 Orientals. No significant difference was found among mean ratios of North American Caucasians, Negroes, and Orientals. A significantly larger mean ratio in Iranians as compared with Negroes may have been related to the method of selection of the former group. It is concluded that the ratio of DPD/IPD is probably independent of race. These observations further confirm the ratio of DPD/IPD as a method useful in assessing the presence of digital clubbing.

Submitted on April 30, 1973
Accepted on June 1, 1973




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K. A. Myers and D. R. E. Farquhar
Does This Patient Have Clubbing?
JAMA, July 18, 2001; 286(3): 341 - 347.
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