-- Get a reference to the item database
local SynastriaItemDB = LibStub('SynastriaItemDB-1.0')

-- Could cause error unless you do "or nil"
local itemInfo = SynastriaItemDB.items[32248]

-- Fetch info safely, returns nil if item does not exist
itemInfo = SynastriaItemDB:GetItem(32248)

-- Get additional info available for some items. Returns nil if additional info does not exists
local additionalInfo = SynastriaItemDB:GetAdditionalInfo(32248)

if SynastriaItemDB:ItemExists(32248) then
    -- Do stuff
end