<prompt> Answer this question truthfullyIn a patient with an elevated serum Ca2 and a low urine Ca2Cr clearance ratio 0.01, what is the likely diagnosis?  <response>: <reason> The likely diagnosis for the patients laboratory findings is familial hypocalciuric hypercalcemia. Familial hypocalciuric hypercalcemia is a rare genetic disorder that affects the bodys ability to regulate calcium levels in the blood. This can result in elevated levels of calcium in the blood hypercalcemia, which can be detected by an elevated serum Ca2 level. In addition, the low urine Ca2Cr clearance ratio 0.01 suggests that the kidneys are not effectively clearing calcium from the urine, which is consistent with familial hypocalciuric hypercalcemia. Diagnosis may involve genetic testing to confirm the presence of a mutation in the calcium-sensing receptor gene. Treatment may involve regular monitoring of calcium levels and may include medications to manage symptoms or complications associated with hypercalcemia. 