Minimum stock and product turnover in the HOF clinic

A product runs out in the middle of the week, an expiration date is discovered on the shelf, a big purchase that "seemed like a good deal" turns into idle money. These three problems show up in many orofacial harmonization (HOF) clinics and share the same root: stock is managed by feel, not by numbers. Injectable products, disposables and support items have different prices, expiration dates and lead times, and treating them all the same way is expensive.

This guide shows how to calculate minimum stock, reorder point and turnover from monthly consumption, how to track expiration and lot, and how to set up simple spreadsheet control. For the general concept of injectables inventory, see injectables inventory in the HOF clinic; for restocking time, see the restocking time calculator.

Why control stock based on consumption?

Because stock is cash stored in the form of product. Buying too little stops the schedule; buying too much ties up money and raises the risk of expiration. Some reasons to treat the subject with a method:

• Products have expiration dates. Idle stock expires, and expiration is a direct loss.
• Some require refrigeration or specific storage. More stock means more risk of storage failure. See cold chain.
• Consumption varies with seasonality. See seasonality in the HOF clinic.
• Lead times change. Suppliers have cutoff dates and delays.
• Money is finite. Every real in stock is a real that is not somewhere else in the clinic.

How do you calculate minimum stock and the reorder point?

The logic uses three numbers per product:

1. Average daily (or weekly) consumption: how much you use, on average. Use the last three to six months.
2. Lead time: days between placing the order and receiving the product.
3. Safety reserve: a margin for variations in consumption and lead time.

Minimum stock = average consumption × lead time + safety reserve

Reorder point = minimum stock (when the level reaches this point, it is time to order)

How do you set the safety reserve?

There is no magic number. Some criteria:

Review the reserve whenever consumption changes. A good habit is to note every stockout: if the product ran out, the reserve was too low.

What is turnover and how does it help?

Turnover measures how many times stock is renewed in a period. A simple way to calculate it:

Turnover = consumption in the period ÷ average stock in the period

High turnover means the product moves fast and the money comes back soon. Low turnover points to excess stock or a rarely used product, with a risk of expiration. A complementary measure is coverage: how many days the current stock lasts at the current rate of consumption.

See the same logic applied to cash flow in cost of idle stock and the impact on margin in profit margin in HOF.

How do you handle products with expiration dates and refrigeration?

For sensitive products, the rule is to look after the identity and conditions of the lot:

• Lot and expiration date log on arrival, with a check of the packaging and documentation. See the lot and traceability log template and injectables traceability.
• First expired, first out (FEFO): organize the shelf to use the oldest lot first.
• Temperature control, when required by the label and the manufacturer, with periodic logging. See botulinum toxin storage.
• Regulatory status check of the product and the supplier. See how to look up an injectable's registration with ANVISA (Brazil's health regulator) and checking whether the supplier is legitimate.
• Quarantine when in doubt: a product with tampered packaging, a suspicious lot or an out-of-range temperature should not be used.

How do you set up control in a spreadsheet?

A simple spreadsheet per product is enough to start:

With a weekly count, the spreadsheet tells you what to order. For the full inventory, see the injectables inventory checklist.

How does stock connect to the schedule and to cash flow?

A full schedule uses more product; an empty schedule leaves stock idle. That is why control should work together with:

• The schedule: booked procedures indicate future consumption. See the HOF clinic schedule.
• Cash flow: large purchases require cash; paying the supplier in installments has a cost. See cash flow in the HOF clinic.
• Supplier negotiation: volume, terms and scheduled delivery. See negotiating with an injectables supplier.
• Losses: breakage and expirations need to show up in the results. See product loss and waste in HOF.

What mistakes should you avoid?

• Control that lives only in one person's head. The spreadsheet should be accessible to whoever restocks.
• Not recording losses. What is not measured is not corrected.
• Mixing clinical-use items and general supplies without categories.
• Forgetting the stock of cheap items, whose absence can stop treatments.
• Impulse buying at trade fairs and promotions. Plan based on consumption.
• Storing a sensitive product in an inadequate place, without a temperature log.

How do you tell critical items from less important ones?

Not every item deserves the same effort. A simple classification helps decide where to be more careful:

Even class C items deserve a defined minimum, because running out of gloves or drapes can stop a treatment. The difference lies in how often you check and how much attention you give to the capital invested.

What if consumption swings a lot?

In campaign months, events or peak dates, consumption goes up; in quieter periods, it goes down. To avoid always being at the limit or with excess:

• Use the average of comparable periods, not the annual average for everything.
• Buy critical items ahead of expected peaks, respecting expiration dates.
• Reduce purchases in slow periods, accepting smaller and more frequent orders.
• Record the causes of large variations (campaign, vacations, protocol change), to understand the pattern.

Combine this control with the HOF clinic indicators and, for support items, with the cost of disposable material per patient. Well-measured stock does the opposite of what it seems: it frees up cash, reduces losses and gives you peace of mind to treat patients without fear of running out of what they need.