Hello,
Causes of increase calcium in urine (hypercalciuria) and calcium stone formation include increased intestinal absorption of calcium, excessive level of certain hormones like parathyroid hormone and vitamin D or excess renal calcium loss due to defect in the kidney.
-The thyroid hormone itself has an effect on increasing renal excretion of calcium thus may promote calcium stone formation especially if you do not take enough fluids. 20% of patients with
hyperthyroidism have high blood calcium level.
-High
blood sugar and
insulin release is known to increase the excretion of calcium thus may also promote calcium stone formation.
-Excess intake or absorption of oxalates may result also in precipitation of calcium in urine and the formation of calcium oxalate crystals and stones.
So investigations would include 24 hours urine analysis (calcium, phosphate, urate, and oxalate levels), kidney function tests, parathyroid hormone,
thyroid function tests and vitamin D level, serum calcium level as well as
blood sugar.
This will provide an idea about the likely cause.
Since the parathyroid hormone was at a normal level, other causes should be checked out.
I advise you to follow up with your doctor he might recommend repeating the blood and urine tests as well as consultation of an endocrinologist.
Please keep us updated.
Best regards.
This answer does not substitute for direct medical consultation.
Dr. Safaa Mahmoud.
MB BCh, MSc Internal Medicine. MD Medical Oncology.
PhD Experimental Medicine and Biochemical Science.
