The Southern District Health Board confirmed this week southern patients needing a routine musculoskeletal ultrasound are waiting 48 to 52 weeks.
Waits were shorter for non-musculoskeletal reasons (25-30 weeks).
Ms Curran said when contacted yesterday she was writing to the health board and Health Minister Tony Ryall on behalf of a constituent who faced a wait of up to one year.
''I'm not mucking around with these things.
''I don't know how many of them are out there, but it's just crazy.
''I find it incomprehensible that people are waiting for a year for a diagnostic procedure for something that's hampering them from being able to function properly.''
Patient services director Lexie O'Shea, in a statement this week, said the board was investigating how to reduce the waiting times.
''Options being looked at include undertaking additional lists where this is possible, and investigating whether some referrals can be undertaken by other providers.
''If you are anxious and think that your condition has deteriorated, you are advised to go back to your GP to be reassessed.''
Those needing urgent scans were being seen on time, she said.
