Setting Par Levels in Your Dental Practice: Step-by-Step Guide

"Just order more when we're running low" seems like a reasonable approach - until you're turning away emergency patients because you're out of anesthetic, or discovering $12,000 worth of expired composite you over-ordered.

Par levels solve both problems. They're the sweet spot between "not enough" and "too much," ensuring you always have what you need without tying up excessive capital in inventory.

This guide shows you how to calculate optimal par levels for every supply category in your practice.

What Are Par Levels? (And Why They Matter)

*Par level* = the ideal quantity to keep on hand for each item

*Reorder point* = the quantity that triggers a new order

*Think of it like your gas tank:*

• Par level = full tank
• Reorder point = quarter tank (time to fill up)
• Running out = empty tank (emergency, expensive, stressful)

*The formula:*

```

Par Level = (Average Daily Usage × Lead Time Days) + Safety Stock

Reorder Point = Average Daily Usage × Lead Time Days

Order Quantity = Par Level - Current Stock

```

Dr. Rachel Kim's practice ran out of local anesthetic 3 times in one month before implementing par levels. "We were guessing. Sometimes we ordered too much, sometimes too little. After calculating actual par levels based on our usage data, we haven't had a single stockout in 8 months."

Step-by-Step: Calculate Your Par Levels

Step 1: Track Actual Usage (2-4 Weeks)

You can't set accurate par levels without knowing your actual usage. Track consumption for your top 50 items over 2-4 weeks.

*How to track:*

• Manual: Tally sheet in central supply area (staff marks when they take items)
• Semi-automated: Scan items out with barcode scanner
• Fully automated: AI inventory system tracks via PMS integration

*What to record:*

• Item name
• Date used
• Quantity used
• Which operatory/provider (if relevant)

*Example data for composite:*

```

Week 1: 18 syringes

Week 2: 22 syringes

Week 3: 15 syringes

Week 4: 20 syringes

Average: 18.75 syringes/week = 2.68 syringes/day

```

*Pro tip:* Track during a "typical" month, not during holidays or slow periods. Avoid December (slow) or back-to-school (surge).

Step 2: Calculate Average Daily Usage

Convert your tracking data to average daily usage:

*Formula:* Total used ÷ Number of days tracked

*Examples:*

*Gloves (nitrile, medium):*

• 4 weeks tracked = 28 days
• Total used: 84 boxes
• Average daily usage: 84 ÷ 28 = 3 boxes/day

*Composite (A2 shade):*

• 4 weeks tracked = 28 days
• Total used: 75 syringes
• Average daily usage: 75 ÷ 28 = 2.68 syringes/day

*Local anesthetic (2% lidocaine with epi):*

• 4 weeks tracked = 28 days
• Total used: 420 cartridges
• Average daily usage: 420 ÷ 28 = 15 cartridges/day

*Important:* Account for variability. If usage fluctuates significantly (50+ swings), use the higher end of your range for safety stock calculation.

Step 3: Determine Supplier Lead Time

*Lead time* = days from when you order until supplies arrive and are shelved

*Components of lead time:*

• Order processing: 0-1 days (immediate online vs calling in)
• Supplier processing: 1-2 days
• Shipping: 1-5 days (next-day vs standard)
• Receiving and shelving: 0.5-1 days

*Example lead times by supplier:*

*Patterson (standard delivery):*

• Order processing: Same day (online)
• Supplier processing: 1-2 days
• Shipping: 3-4 days
• Total: 4-6 days → Use 6 days for calculations

*Amazon Business (Prime):*

• Order processing: Same day
• Supplier processing: 0 days
• Shipping: 2 days
• Total: 2 days

*Local supplier:*

• Order processing: Call-in (1 day)
• Supplier processing: 1 day
• Delivery: Same day or next day
• Total: 1-2 days

*Critical:* Use your actual experienced lead time, not the supplier's promised time. If they say 3-5 days but it usually takes 7, use 7 days.

Step 4: Calculate Safety Stock

Safety stock protects against:

• Usage spikes (emergency patients, busy week)
• Delivery delays (supplier backorders, shipping delays)
• Ordering delays (staff forgot to order)

*Safety stock formula:*

```

Safety Stock = Average Daily Usage × Safety Days

```

*How many safety days?*

• *Critical items* (anesthetic, gloves, sterile items): 7-10 days
• *Important items* (composite, impression materials): 5-7 days
• *Standard items* (cotton rolls, gauze): 3-5 days
• *Low-priority items* (optional materials): 1-3 days

*Example safety stock calculations:*

*Local anesthetic (critical):*

• Average daily usage: 15 cartridges/day
• Safety days: 7 days
• Safety stock: 15 × 7 = 105 cartridges

*Composite A2 (important):*

• Average daily usage: 2.68 syringes/day
• Safety days: 5 days
• Safety stock: 2.68 × 5 = 13.4 syringes → round to 14

*Cotton rolls (standard):*

• Average daily usage: 4 bags/day
• Safety days: 3 days
• Safety stock: 4 × 3 = 12 bags

Step 5: Calculate Par Level and Reorder Point

Now combine everything:

*Par Level Formula:*

```

Par Level = (Average Daily Usage × Lead Time) + Safety Stock

```

*Reorder Point Formula:*

```

Reorder Point = (Average Daily Usage × Lead Time) + (Safety Stock × 0.5)

```

*Example: Gloves (Nitrile, Medium)*

• Average daily usage: 3 boxes/day
• Lead time: 6 days (Patterson standard)
• Safety days: 7 days (critical item)

*Calculations:*

```

Par Level = (3 × 6) + (3 × 7)

Par Level = 18 + 21 = 39 boxes

Reorder Point = (3 × 6) + (21 × 0.5)

Reorder Point = 18 + 10.5 = 28.5 → round to 29 boxes

Order Quantity = 39 - current stock

```

*What this means:*

• Always try to have 39 boxes on hand (par level)
• When stock drops to 29 boxes, reorder (reorder point)
• If you have 15 boxes when reordering, order 24 boxes (39 - 15)

*Example: Composite A2*

• Average daily usage: 2.68 syringes/day
• Lead time: 6 days
• Safety days: 5 days

*Calculations:*

```

Par Level = (2.68 × 6) + (2.68 × 5)

Par Level = 16 + 13.4 = 29.4 → round to 30 syringes

Reorder Point = (2.68 × 6) + (13.4 × 0.5)

Reorder Point = 16 + 6.7 = 22.7 → round to 23 syringes

```

Step 6: Adjust for Real-World Factors

The math is a starting point. Adjust for practice-specific factors:

*Seasonal Variations:*

• Busier in summer/back-to-school? Increase par levels 15-20%
• Slower in December/holidays? Decrease par levels 10-15%
• Review and adjust quarterly

*Minimum Order Quantities:*

• Supplier requires minimum 10 boxes? Round order quantity up
• Can only order in cases of 12? Adjust par level to match

*Storage Space:*

• Limited refrigerator space for temperature-sensitive items? Lower par levels
• Huge storage room? Can carry higher par levels safely

*Cash Flow:*

• Tight on cash? Lower par levels (higher risk, lower capital tied up)
• Strong cash position? Higher par levels (lower risk, more capital tied up)

*Shelf Life:*

• Short shelf life (6 months)? Lower par levels
• Long shelf life (3+ years)? Higher par levels acceptable

Dr. Wong adjusted composite par levels seasonally: "We do more cosmetic procedures May-August (wedding season, vacation time). I bump our composite par levels up 25% April-August, then back down September-March. Prevents stockouts during peak season."

Category-Specific Par Level Strategies

Anesthetics (Critical Priority)

*Considerations:*

• Zero stockouts acceptable
• Refrigeration required
• DEA controls on some types
• High usage variability

*Recommended approach:*

• 10 days safety stock minimum
• Track by provider (Dr. A uses more than Dr. B)
• Separate par levels for each type (articaine vs lidocaine)
• Weekly counts for accountability

*Example par levels:*

```

2% Lidocaine with 1:100,000 epi:

• Daily usage: 15 cartridges
• Lead time: 6 days
• Safety stock: 10 days
• Par level: (15 × 6) + (15 × 10) = 240 cartridges
• Reorder point: 165 cartridges

```

Gloves (High Volume Consumable)

*Considerations:*

• High volume = high cost if over-stocked
• Multiple sizes needed
• Bulk discounts available
• Long shelf life

*Recommended approach:*

• 5-7 days safety stock
• Track by size separately
• Buy in bulk when discounts exceed 15%
• Consider two-bin system

*Example par levels:*

```

Nitrile gloves, Medium:

• Daily usage: 3 boxes
• Lead time: 6 days
• Safety stock: 7 days
• Par level: (3 × 6) + (3 × 7) = 39 boxes
• Reorder point: 29 boxes

Nitrile gloves, Large:

• Daily usage: 1.5 boxes
• Lead time: 6 days
• Safety stock: 7 days
• Par level: (1.5 × 6) + (1.5 × 7) = 19.5 → 20 boxes
• Reorder point: 15 boxes

```

Composites (Temperature-Sensitive, Expensive)

*Considerations:*

• Refrigeration required
• Multiple shades needed
• Moderate shelf life (18-24 months)
• Usage varies by shade

*Recommended approach:*

• Track usage by shade separately
• 5 days safety stock (refrigeration limits)
• FEFO rotation critical
• Monthly expiration audits

*Example par levels by shade:*

```

A1 (high use):

• Par level: 25 syringes
• Reorder point: 18 syringes

A2 (very high use):

• Par level: 30 syringes
• Reorder point: 23 syringes

D4 (low use):

• Par level: 8 syringes
• Reorder point: 6 syringes

```

Tools for Managing Par Levels

Spreadsheet Method (Free)

Create columns for:

• Item name
• Average daily usage
• Lead time
• Safety days
• Par level (calculated)
• Reorder point (calculated)
• Current stock
• Order quantity (calculated)

*Pros:* Free, customizable, familiar

*Cons:* Manual updates, no automated alerts

Download free par level calculator template

Inventory Software ($150-500/month)

Software like Practice Stock Wise calculates par levels automatically and sends reorder alerts.

*Pros:* Automated tracking, alerts, optimized over time

*Cons:* Monthly cost, learning curve

Hybrid Approach

Use software for high-value and critical items (top 100 SKUs), spreadsheet for commodity items.

Common Par Level Mistakes

*Mistake 1: Set-and-forget*

Usage changes over time. Review par levels quarterly, adjust as needed.

*Mistake 2: Same safety stock for everything*

Critical items need more buffer than nice-to-have items.

*Mistake 3: Ignoring lead time variability*

If lead time is 3-7 days, use 7 days in calculations, not average of 5.

*Mistake 4: Not accounting for provider differences*

Dr. A uses 2x more composite than Dr. B. Track separately if usage varies significantly.

*Mistake 5: Confusing par level with max capacity*

Par level = ideal amount. Max capacity = most you can physically store. They're different.

Measuring Success

After implementing par-level-based ordering for 90 days, you should see:

✓ 90%+ reduction in stockouts

✓ 30-50% reduction in emergency orders

✓ 15-25% reduction in inventory carrying costs

✓ 60%+ reduction in expired waste

✓ 40%+ reduction in time spent on ordering

If not achieving these, either par levels are incorrectly calculated or staff isn't following the system.

---

*Want automatically calculated and optimized par levels?* See how Practice Stock Wise uses AI to set and adjust par levels based on real-time usage.

*Related Articles:*

• Automated Inventory Tracking for Dental Practices
• 7 Dental Inventory Management Mistakes Costing You Thousands
• AI for Dental Inventory Management

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