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Both are different and indication also

Both are different

Doppler will detect blood flow in penis blood vessels ..and sonography will detect any abnormalities.. they are little difference between both  tests ..so nothing to worry ..

Whats your problem and symptoms sir First u tell sir Why u need these test Test is not treatment sir

If you trying to identify issue related to your erection or timing this is not something which will give you accurate results. For proper guidance and assistance on your issues feel free to contact me.

Both are same

Purpose of tests decides which test needs to be done