Dhirajaya Dharma Kadar, Ginanda Putra Siregar


Introduction:  Hounsfield unit (HU) is used to indicate the radiodensity of urinary stones. Our study aims to describe the relationship between HU with urinary stone.

Material Methods: A retrospective cross-sectional study was conducted with thirty patients with kidney stones that have examined with NCCT. 

Results: The mean age of patients was 51.0 + 10.4 years, with 15 patients were male (50%), and 15 others were female (50%). The median value of HU level was 661 (range 200-1499). Thirty patients in our study, 16 stones (53.3%) were composed calcium, while 14 others (46.7%), were composed mostly of uric acid. ROC analysis that HU criteria to predict stone composition have sensitivity 71,4% specificity 87,5% PPV 83.33% and NPV 77.78%.

Conclusion: The threshold of 500 HU on the CT scan determined as the optimal cut-off point in deciding whether a urinary stone composition is predominantly calcium stone or uric acid stone.



Hounsfield Unit, NCCT, Calcium stone, Uric acid stone

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