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Capsule Packing Competency Test

Assess capsule-filling uniformity across a 10×10 capsule plate with guided weighing and heat map analysis to identify packing bias.

Disclaimer: This tool is provided for informational and educational purposes only. Results should always be independently verified by a qualified healthcare professional before use in clinical practice. Compound Direct accepts no liability for errors or clinical decisions made based on these calculations.
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Total target weight including capsule shell and fill

Capsules within ±5% of ideal will be marked as acceptable

How to Use This Tool

  1. Enter the staff member's name, date, ideal capsule weight, and acceptable deviation.
  2. Click “Start Weighing” to enter the guided data-entry mode.
  3. Weigh each capsule and enter its weight. Press Enter to advance to the next position. Click any cell in the grid to jump back and correct a weight.
  4. Once all 100 capsules are recorded, click “View Results” to see the heat map.
  5. Review the heat map and statistics. Green cells are near the ideal weight, red cells indicate overfilling, and blue cells indicate underfilling. The colour intensity reflects the degree of deviation.
  6. Print or copy the results for record-keeping.

Formula & Methodology

Weight Uniformity Testing

USP <905> and BP Appendix XII C describe weight uniformity requirements for compounded capsules. Each capsule in a batch should fall within an acceptable range of the target fill weight. Deviations beyond this range indicate inconsistent packing technique.

Relative Standard Deviation (RSD)

RSD (also called coefficient of variation) measures the spread of capsule weights relative to the mean. An RSD below 2% is generally considered excellent for hand-packed capsules. Values between 2–4% are acceptable, while above 4% suggests the operator needs further training or the process needs improvement.

RSD (%) = (Standard Deviation ÷ Mean) × 100

Positional Bias

When packing capsules on a plate, operators often develop unconscious bias patterns. Common examples include overfilling capsules nearest to the dominant hand, underfilling edges of the plate, or creating a gradient from one corner to the opposite. The heat map reveals these patterns by comparing each capsule's weight to the ideal, colour-coded by deviation. Quadrant analysis summarises the bias into four regions.

Frequently Asked Questions

What is an acceptable RSD for hand-packed capsules?
An RSD below 2% is considered excellent. Between 2–4% is generally acceptable for hand-packing. Above 4% indicates inconsistency that may need to be addressed through additional training or process changes.
How do I interpret the heat map?
The heat map uses a continuous diverging colour scale. Green represents the ideal weight, transitioning through yellow/orange to red for overfilling, and through light blue to dark blue for underfilling. The colour extremes (deep red and deep blue) correspond to the deviation % you set — for example, if you chose 10%, then deep red = +10% overfill and deep blue = −10% underfill. Look for patterns like gradients across the plate, which suggest the operator should rotate the plate during packing.
How often should packing competency be assessed?
Best practice is to assess competency at initial training, then periodically (e.g., every 6–12 months) and whenever a new product or capsule size is introduced. Some regulatory frameworks require documented evidence of operator competency.
What does the quadrant bias analysis show?
The quadrant analysis splits the 10×10 plate into four quadrants (top-left, top-right, bottom-left, bottom-right) and calculates the average weight in each. If one quadrant is consistently heavier or lighter, it indicates the operator has a positional bias — for example, packing more firmly on their dominant-hand side.

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