EasyDisc YEA Test

Heterotrophic plate counts in 44 hours

  • No equipment, autoclaving, or agar preparation
  • Results in 44 hours when incubated at 36°C and 68 hours when incubated at 22°C 
  • Easy-to-count blue colonies, designed to correlate with ISO 62221
  • Published by ASTM International as Standard D8516-23
  • Received NF Validation by AFNOR Certification, reference number IDX 33/09-03/22.

Contact us

Gloved hand demonstrating how to use the IDEXX EasyDisc platform.

Easy-to-use platform reduces waste and improves workflow

  • 18-month shelf life eliminates waste and improves workflow
  • 1-minute hands-on time
  • Reduced QC
  • Available in 25-pack and 100-pack configurations

Learn about the EasyDisc platform

Easy to run

Step 1 of IDEXX EasyDisc process

Step 1. Remove lid and add 1 mL sample to the EasyDisc YEA plate.

Step 2 of IDEXX EasyDisc process

Step 2. Gently swirl the plate to distribute the liquid, replace the lid, and incubate at room temperature for 20 minutes.

Step 3 of IDEXX EasyDisc process.

Step 3. Continue incubating at 22°±2°C for 68±4 hours or 36°±2°C for 44±4 hours

Step 4 of IDEXX EasyDisc process.

Step 4. Count all colonies.

Frequently asked questions

The shelf life is up to 18 months from date of manufacture.

Yes, the base and lid are both sterilized. There are 25 plates per plastic sleeve. Any unused plates should remain in the bag, and the bag should be closed. Do not leave any unused plates exposed to the environment.

The clear bottom portion of the plate is made of polystyrene #6 and is recyclable. The white cover/lid is made of low-density polyethylene #4 and is also recyclable.

Water samples are incubated at 22°C (±2°C) for 68 hours (±4 hours) or 36°C (±2°C) for 44 hours (±4 hours).

Check with your local, state, and/or federal authorities for proper disposal of bacteriological biohazard materials at your facility.

Resources and tools

Tests & accessories

Search the Water Tests & Accessories tool

Product information

EasyDisc YEA Test (25-test pack)
Product number: 98-0013453-00
Catalog number: WYEA25

EasyDisc YEA Test (100-test pack)
Product number: 98-0013452-00
Catalog number: WYEA100

Product number: 98-29006-01
Catalog number: WQC-HPC


IDEXX Water has reference materials and approval documents to support the many products in our water portfolio. Find the document(s) you need by selecting the link below.

Search the Reference & Regulatory Documents tool

Water Customer Support

Corporate Headquarters
IDEXX Laboratories, Inc.
One IDEXX Drive
Westbrook, Maine 04092 USA

Tel: 1-800-321-0207
Fax: 1-207-556-4630

Find a representative near you

ISO certifications

Locations and ISO certificates


1. International Organization for Standardization. ISO 6222:1999. Water Quality—Enumeration of Culturable Micro-Organisms—Colony Count by Inoculation in a Nutrient Agar Culture Medium. Geneva: International Organization for Standardization; 1999.