Blood and Urine Samples
In addition to the dip-stick test, urine should be sent for microscopy and culture if infection is suspected from the history or examination.
Recurrent stone formers should have a 24 hour urine collection for:
- Urine volume
- Calcium
- Oxalate
- Uric acid
- Citrate
- Sodium
- Creatinine
Specific therapy will be indicated if abnormalities are found in the course of this screening, e.g. allopurinol for uric acid stones, and measures required to increase calcium excretion in hypercalcaemia, such as thiazide diuretics.
A full blood count and electrolyte screen should be taken.