Standard client server accounting packages normally have fairly comprehensive Inventory modules that integrate with General Ledger and Job Costing.

The purpose of integrating Inventory with General Ledger and it so that one can see the general health of the company by way of looking at debits and credits.

Integrating Inventory with Job Costing enables one to see if they have enough materials of different types to perform medical procedures that are scheduled.

Integrating Accounts Receivable, Accounts Payable with Job Costing enables one to see what is spent vs. what is paid by different patients.