Knowledge &
Resource Center
Profiency Testing Program
Benchmarking Your Laboratory
ADPIAmerican Dairy Products Institute is your source to ensure that your dairy laboratory’s test results measure up to peers in the industry. As a member benefit of ADPIAmerican Dairy Products Institute, the Proficiency Testing Program is your opportunity to confirm you’re getting the right results, the right way.
ADPIAmerican Dairy Products Institute partners with Eurofins to administer the Proficiency Testing Program. We currently offer three products groups in the Program. When registering for the program, organizations may select a single category or a mix of product groups that best align with your organization’s portfolio of dairy ingredients production.
Product Groups Offered (2025)
Nonfat Dry Milk (NDM)
Test Parameters:
- Protein
- Fat
- Moisture
- AshResidue that remains when milk/whey is heated to very high temperatures in a muffle oven. Organic acids are lost during ashing. Some minerals such as sulfur and phosphorous also may be lost. Other minerals may be converted to oxides, sulfates, phosphates, silicates and chlorides. In general, ash overestimates the concentration of minerals present since oxygen is combined with minerals in the remaining ash. The term often is used interchangeably with minerals and milk salts.
- Titratable Acidity
- SolubilityAbility of a liquid to dissolve another material. Examples: Lactose dissolving in water, alcohol dissolving in water. Index
- WPN
Whey Protein Concentrate (WPC)
Test Parameters:
- Protein
- Fat
- Moisture
- Ash
- Titratable Acidity
- pH
- Lactose
Milk Protein Concentrate (MPC)
Test Parameters:
- Protein
- Fat
- Moisture
- Ash
- Titratable Acidity
- Solubility Index
- Lactose
Cost of the Program (2025)
Member organizations can participate at $329 per round/$987 per year for each product chosen.
Samples cannot be distributed among multiple locations; multiple shipment destinations will require multiple purchases.
Timing of the Program (2025)
Participants may subscribe to one or more individual rounds, or to the entire program on an annual basis.
Round 1: April with summary reported in May
Round 2: July with summary reported in August
Round 3: October with summary reported in November
FAQ's
Enroll anytime during your active membership with ADPIAmerican Dairy Products Institute.
Yes, one set consists of 4 samples which can be distributed among multiple technicians.
Your data is coded in the summary report. Unless you share your ID information, no one will know which results are yours.
Questions?
Andy Powers
VP of Technical Services
apowers@adpi.org | 630.530.8700 x225 (oOxygen) or 224.500.4333 (cCarbon)
