Start from the question, not the test.

Peptide analysis

• What is the concentration of peptide in the vial, checked against the label claim? (Potency (concentration))
• What is the purity of the peptide in the vial, checked against the label claim? (Purity)
• Is the peptide what the product states it is? (Mass Confirmation)

Contamination screening

• Are endotoxins present in the sample? (Endotoxins)
• Is the product free from bacterial contamination? (Sterility)

Product properties

• What heavy metal concentrations are present in the product? (Metals)
• What is the pH of the product? (pH)