Is it possible to have kidney stones, but not have any evidence of them in urine samples or ultrasounds?
Kidney stones. Kidney stones may present as sand in the sediment of urine can only be detected when the urine is strained.
Might someone have kidney stones, but not have any evidence of them in a urine sample or an ultrasound?
Yes. Having kidney stones is detected by radiological means. Tis includes plain films, ultrasound, and ct scans. The gold standard test is the ct scan but it emits a lot of radiation. Ultrasound is also a good study but much more limited. It can certainly miss small stones in the kidney and will miss all stones in the ureter (kidney tube) because ultrasound cannot adequately visualize the ureter. Read more...