Registry report with Lab results (positive patients)

Hello All:  I need to run a registry report with gonorrhea chlamydia test positive.  Quick turn around help would be much appreciated.

What I did so far?
Using the Lab/DI/Procedure tab- Lab type and Date Range, i got total number of patients.
BUT, it does not give me subsets of patients when i select either of positive, negative, etc.
I need to get positive patients only.

Thanks.

Kumar