---
title: "COA Reader: Check a Peptide Lab Report Yourself"
url: https://www.primaralabs.com/tools/coa-reader
source: Primara Labs, markdown mirror of the HTML page
---

# Check a lab report against the laboratory's own record.

A certificate of analysis is only as good as the laboratory's own copy of it. This tool builds the verification address for a Janoshik report from its task number and key, lists what to compare, explains what each kind of test does and does not show, and converts an endotoxin figure between per vial and per mg. **Nothing you enter here is sent anywhere.**

Primara Labs sells some of the compounds covered here. Every figure on this page links to its source and the date it was checked.

Updated 24 September 2026

Tool

## Read a report

### Open the laboratory's record

Laboratory

Janoshik prints a task number and a unique key on every report. The verification page shows the laboratory's own copy of the report.

Task numberVerification key

Enter a task number (digits) and key (letters and digits) to build the address.

### Endotoxin: per vial to per mg

Some reports give endotoxin per vial, others per mg. To compare them, divide the per-vial figure by the milligrams of compound in the vial.

EU per vialmg in the vial

EU per mg: enter both figures

The pharmacopeial threshold used for parenteral materials is 5 EU per kilogram of body weight per hour.

Checklist

## What to compare

1.  1\. Compound
    
    The sample name on the laboratory's record should be the compound on the vial, not a related one.
    
2.  2\. Batch
    
    The batch on the record should match the batch printed on the vial in hand. A report for another batch says nothing about this one.
    
3.  3\. What the test covers
    
    An endotoxin test says nothing about identity or purity; an identity test says nothing about endotoxin. Read the tests requested line.
    
4.  4\. The figure and its unit
    
    The result should match what the seller quotes, in the same unit. Per vial, per mg and per mL are not interchangeable.
    
5.  5\. Dates
    
    Check the order, receipt and analysis dates, and that the analysis is recent enough to describe the stock being sold.
    
6.  6\. Client name
    
    The client on the record is who sent the sample. It tells you who commissioned the test, not who made the product.
    

Tests

## What each test covers

Identity

An identity test checks that the substance is the compound named. Mass spectrometry measures the molecule's mass directly; an HPLC identity check compares how long the sample takes to pass through a column against a reference standard, which is weaker evidence on its own.

Purity

A purity result, usually by HPLC, is the share of the detected material that is the target compound. It does not by itself prove what that compound is, which is why purity is normally paired with an identity test.

Amount in the vial

A quantity result states how much of the compound the vial holds, usually in milligrams. A vial can be pure and still hold less than its label says.

Endotoxin

An endotoxin test, usually the LAL assay, measures bacterial endotoxin in endotoxin units. It does not show identity, amount or purity.

Heavy metals

A heavy metals screen, usually by ICP-MS, measures metals such as lead, cadmium, arsenic and mercury. It says nothing about the peptide itself.

Sterility

A sterility or microbial test checks for living bacteria and fungi. A sterile sample can still carry endotoxin, which is measured separately.

Identity and purity

## Purity is not identity, and a blind test is stronger

A purity result, usually by HPLC, is the share of the detected material that is the target compound. It does not by itself prove what that compound is, which is why purity is normally paired with an identity test.

An identity test checks that the substance is the compound named. Mass spectrometry measures the molecule's mass directly; an HPLC identity check compares how long the sample takes to pass through a column against a reference standard, which is weaker evidence on its own.

In a blind test the laboratory is not told which compound to expect and has to identify it. That is stronger than a test that confirms a compound named in advance, because a named-target test can only say whether the expected compound is present.