[The determination of aldosterone, thromboxane A2 and prostacyclin in biological fluids]

The authors' findings have lead them to a conclusion that urinary prostacyclin may be measured directly without preliminary extraction. Double freezing-defrosting of the samples did not change urinary thromboxane A2 level. Prolonged (up to 8 months) storage did not tell on urinary thromboxane A2 and blood plasma aldosterone levels.