|| 42yr old woman comes for follow up exam. Two weeks ago her bp was 154/94 during a routine exam. Pulse is 76/min, RR 14 exam shows no other abnormalties. Serum studies show Na 142, k-4, cl-105, hco3-26, BUN 12, glucose 101, cr 0.8.
an ECG shows no abn. Most appropriate next step in management
a)measurement of plasma rennin activity
b)serum lipid studies
c)24 hr urine collection for measurement of metanephrine
d)captopril renal scan