Sample Requirements:
Random urine collection. No preservatives.
Purpose:
Assesses calcium excretion in a spot urine sample; helpful in evaluating kidney stones or calcium metabolism.
High Levels:
Hyperparathyroidism, high dietary calcium, vitamin D toxicity.
Low Levels:
Hypoparathyroidism, malabsorption, vitamin D deficiency.
Reference Range:
<20 mg/dL