The WalMart in my area sells an HTH 5-way test that includes a test for CYA. If your test kit doesn't mention it then it doesn't test for it.

By the way the calcium test in the HTH kit didn't work correctly on my water. I got Ben's kit from poolsolutions.com and the test in that kit worked fine. Ben's kit also tests for free and combined chlorine where the HTH test only tests for total chlorine.

Peter