I am not sure what you want to do exactly, or what you mean by "output".
you can redirect dd's stdout to a file with:
~ $ dd if=/dev/zero of=/dev/null bs=4096 count=2 > ddlog.txt 2>&1
~ $ cat ddlog.txt
2+0 records in
2+0 records out
8192 bytes (8.2 kB) copied, 2.0977e-05 s, 391 MB/s
Other than that suggestion, can you clarify your question.