> For the complete documentation index, see [llms.txt](https://docs.rplpeptides.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rplpeptides.com/docs/glossary/quality-control/acceptance-criteria.md).

# Acceptance Criteria

## Definition

Acceptance criteria are predefined numerical limits or descriptive requirements that a product must meet to be considered acceptable for release and use.

## Overview

Acceptance criteria translate quality specifications into specific pass/fail thresholds. They define the range of acceptable results for each quality parameter (purity, identity, appearance, etc.) and are the basis for batch release decisions.

## Technical Explanation

**Types of Acceptance Criteria:**

| Type             | Example                   | Interpretation                    |
| ---------------- | ------------------------- | --------------------------------- |
| Quantitative NLT | Purity NLT 98%            | ≥98% is acceptable                |
| Quantitative NMT | Water NMT 5%              | ≤5% is acceptable                 |
| Range            | pH 4.0–6.0                | Between 4.0 and 6.0 is acceptable |
| Qualitative      | White to off-white powder | Visual match required             |
| Positive         | Identity conforms         | MS confirms MW                    |

**NLT and NMT:**

* **NLT:** Not Less Than (minimum acceptable value)
* **NMT:** Not More Than (maximum acceptable value)

**Decision Flow:**

1. Test the sample
2. Compare result to acceptance criteria
3. All criteria met → Batch passes (released)
4. Any criterion not met → Batch fails (rejected)

## Importance in Peptide Documentation

Acceptance criteria are explicitly stated on the COA, allowing researchers to independently verify that every tested parameter falls within the acceptable range. Understanding these criteria is essential for evaluating product quality.

## Related Terms

* [Specification](/docs/glossary/quality-control/specification.md)
* [COA](/docs/glossary/quality-control/coa.md)
* [Quality Standard](/docs/glossary/quality-control/quality-standard.md)

## Frequently Asked Questions

**Q: Can acceptance criteria vary by product grade?** A: Yes. Research-grade and GMP-grade products typically have different acceptance criteria. Higher-grade products have tighter specifications.

**Q: What does "pass" mean on a COA?** A: "Pass" means the test result meets the defined acceptance criteria. Some COAs use "Conforms" or "Complies" instead of "Pass."


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