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which is the best screening test for renal artery stenosis

1.captopril renogram

or

gadalonium enhanced 3dimensional MRA

i think best screening test is renal duplex sonography---no iv lines, no dye or meds,takes captopril renogram--pt need to take med(captopril),less accurate when kidney function is poor or narrowing of arteries in both kidneys

MRA---low risk but require prolong stay in hospital

oops could not complete the sentence above.I meant to say that best screening test is renal duplex sonography---no iv lines, no dye or meds,takes less than an hr.

i think so but most specific non invasive test should be MRA .