title: Sonographic measurement of kidney size in geriatric patients.
abstract: OBJECTIVE
  The aim of this study was to compare the value of absolute and relative renal length (ARL and RRL, respectively) measurements in determining variations in normal kidney size related to sex, body height, and increasing age among patients older than 60 years.
  
  
  METHODS
  Kidney sizes were prospectively measured sonographically in patients older than age 60 years. Longitudinal renal lengths (ARLs) were measured, and the RRLs were calculated by dividing the ARL by the body height. ARL and RRL measurements were analyzed according to sex, age, and body height.
  
  
  RESULTS
  The ARLs and RRLs of the left kidney in 236 patients were significantly greater than those of the right kidney (p < 0.05) in both sexes. The ARLs for both kidneys were also significantly greater in men than they were in women (p < 0.05). In contrast, the RRLs for both kidneys were significantly lower in men than they were in women (p < 0.05). Both left and right ARLs decreased significantly with increasing age regardless of sex (p < 0.01 and p < 0.05, respectively). The same was true for left and right RRLs (p < 0.01 and p < 0.05, respectively).
  
  
  CONCLUSIONS
  Renal size decreases with increasing age among patients older than 60 years. In our series of geriatric patients, the use of RRLs could not completely eliminate variations related to a subject's height, sex, and age. Therefore, we recommend that the ARL be used for renal measurements in geriatric patients.
authors.affiliation: Department of Radiology, Marmara University Medical Faculty, Tophanelioğlu Caddesi 13/15, 81190 Altunizade, Istanbul, Turkey.
authors.forename: Ihsan Nuri
authors.initials: IN
authors.lastname: Akpinar
authors.forename: Ersan
authors.initials: E
authors.lastname: Altun
authors.forename: Serhat
authors.initials: S
authors.lastname: Avcu
authors.forename: Davut
authors.initials: D
authors.lastname: Tüney
authors.forename: Gazanfer
authors.initials: G
authors.lastname: Ekinci
authors.forename: Tuğrul
authors.initials: T
authors.lastname: Biren
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000886:Anthropometry; D005260:Female; D006801:Humans; D007668:Kidney / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D018709:Statistics, Nonparametric; D014463:Ultrasonography