Tracking lab costs and supplies separately from other practice expenses is essential for understanding your true margins on procedures that involve testing. Most practices lump everything into a general “supplies” category and never know which services are actually profitable.

Start by setting up distinct expense categories in your accounting software. At minimum, separate lab reagents and testing supplies from general medical supplies like gloves, gauze, and syringes. Keep office supplies in their own category as well. If you run multiple types of tests in-house, consider breaking lab costs down further by test category so you can see where the real spending happens.

Code every purchase correctly when you enter it, not weeks later when you can’t remember what was in that shipment. When a lab supply order arrives, match the invoice to your packing slip and categorize each item. Letting invoices pile up or coding everything as “medical supplies” defeats the purpose of tracking.

Track spending by vendor. If you order from multiple lab supply companies, knowing your spend with each helps you negotiate better pricing or consolidate orders. Run a vendor report quarterly to see if costs are creeping up with specific suppliers.

Reconcile your recorded expenses with vendor statements monthly. Some lab supply vendors send monthly statements showing all purchases and credits. Compare these to what’s in your books. Discrepancies usually mean missed invoices, duplicate entries, or credits you never recorded.

Review lab costs as a percentage of related revenue monthly. If you’re running labs in-house, those supply costs should stay relatively consistent as a percentage of what you bill for those services. A sudden jump might mean waste, pricing changes, or a shift in the types of tests you’re performing. You won’t catch these patterns without consistent tracking.

Working with a medical billing service in Macomb that also handles bookkeeping gives you an advantage here. Someone who understands both sides can connect your lab expenses to the procedures being billed and show you which tests are worth doing in-house versus sending out.

For medical and dental practices, supply costs are often the second or third largest expense after labor. Knowing exactly where that money goes is the difference between a practice that stays profitable and one that wonders why the numbers never seem to work out.