Injectable Inventory Tracking: Units In, Units Out

Injectables are often a med spa's biggest product expense, and the hardest to see clearly. Units are drawn per treatment, vials are opened and expire, syringes are sometimes partly used. Without a routine, the gap between what you buy and what you charge for can grow unnoticed.

The core idea: units in versus units out

Every month, compare three numbers for each product:

1. Units purchased from your invoices
2. Units charged to clients in your POS or EMR
3. Units on hand from a physical count at month-end

Expected on hand = starting count + purchased − charged. The difference between expected and actual is your variance: waste, expired product, free touch-ups, uncharged treatments or errors.

Set up the basics

• Record every injectable treatment with the units or syringes used, not just the area treated.
• Log lot numbers and expiry dates. This is good clinical practice and makes counts easier.
• Count physical stock at the same time each month.
• Record complimentary treatments and touch-ups as zero-dollar visits with units used.

Reading the variance

A small variance is normal, especially for reconstituted products. A growing or large variance needs investigation:

• Waste: opened vials expiring before they are used. Scheduling injectable appointments closer together can reduce this.
• Under-charging: units used but not billed, or a per-area price that covers fewer units than are being injected.
• Free treatments: touch-ups and comps not being recorded.
• Shrinkage: product leaving the clinic without a treatment.

Track by provider

Average units per treatment area can vary between providers. That is not always a problem, as dosing is a clinical decision, but it affects margin, especially with per-area pricing. Seeing the numbers helps you align pricing and protocols.

Turn it into a monthly report

For each product: opening count, purchased, charged, expected closing, actual closing, variance in units and in dollars. Add the dollar variances together. That total is a direct cost to your margin, and reducing it is often the quickest profit improvement available.