Testing by Vanguard Laboratory · Olympia, Washington360-967-7010

Microbiology & hygiene

Yeast, mold & indicator organisms

Use microbial counts to study product quality and investigate unwanted change.

Match the count to the concern

Yeast and mold can be relevant to fermentation and spoilage questions. Aerobic counts and coliform indicators provide other kinds of information. Choose the measurement for the product and objective.

Document product history

Record the development version, production date, storage and package condition. For an investigation, keep affected and comparison units separately identified.

Choose a consistent basis

The result may be expressed per gram, per milliliter or on another defined sample basis. Keep the method and basis consistent when comparing versions or study time points.

Know the limits

Indicator counts do not identify every organism or establish the absence of pathogens. Follow-up identification or targeted testing can be scoped when the next question requires it.

Related testing & guidance

Technical & service references

Vanguard service details

Source review: November 8, 2026. The agreed method and project scope govern the testing.

Start with a defined scope

Build your launch testing plan

Tell us the sample, the question and the decision your results need to support.

Build a testing request