of urine sediment (in a fresh sample) can be very useful to detect abnormal cells
(e.g. blood ceils, cancer cells) and crystals. If possible the urine should be fresh
as crystals precipitate out as urine cools and other changes occur with changes in
acidity or alkalinity.
Struvite, oxalate, urate and cystine crystals may be associated
with urolithiasis and sometimes with primary or secondary urinary tract infection. Ammonium
urate crystalluria occurs with liver disease and portocaval shunts. Calcium containing
crystals may increase in the presence of hyperparathyroidism.