The present work is devoted to investigate the meaning of disorders in renin secretion in primary and secondary hypertension and report the results of bayesan analysis applied to a group of 125 hypertensives who underwent selective renal angiography and polydistrictual renal vein samplings for the determination of plasma renin activity for diagnostic and therapeutic purposes. Data obtained from statistical analysis allow specifications on the prevalence of disorders, rates of false positives and false negatives, predictive value, diagnostic value, sensitivity and specificity. The weighted data are useful to validate the reliability of the renin renal vein measurements which are used in clinical practice for identifying the potentially surgically curable forms of arterial hypertension.