 For decades, the only imaging study available to us has been x-ray, and the use of ultrasound has opened up many, many more possibilities. We can now look for things like gallstones, kidney stones, blood clots in the legs. We've even been able to diagnose a retinal detachment in the eye. At the Newark Urgent Care, we do what we call POC testing, which stands for point-of-care testing, which is a much more focused exam. We looked at one specific organ to try to answer one specific medical question.