Using Somatic Cell Counting for Mastitis Screening

Somatic cell count (SCC) is an indicator of udder inflammation. Testing can help dairy farms investigate potential mastitis, including subclinical cases in which the milk may show no visible changes.

Use SCC to guide investigation

A result around or above 200,000 cells/ml in an individual dairy cow is commonly used as a screening threshold for possible intramammary infection. Compare the result with previous measurements and the animal’s condition. Individual-cow thresholds should not be confused with bulk-tank quality limits.

Measure with a dedicated cell counter

The SomaticScan automated somatic cell counter uses fluorescence microscopy and image analysis to count cells in a stained milk sample. Follow the preparation and operating instructions to support consistent testing.

What a cell count cannot tell you

SCC does not identify a mastitis-causing pathogen, test for antibiotic residues, or select a treatment. Clinical examination and additional testing, including laboratory investigation where appropriate, may be needed.

Build a repeatable monitoring process

• Identify each sample and record the date and animal or batch.
• Follow consistent sampling and handling instructions.
• Review elevated results and changes over time.
• Discuss investigation and treatment decisions with your veterinarian.

Read the SCC testing FAQ and compare somatic cell counters.

Sources

Cornell University: udder health and SCC screening thresholds; Penn State Extension: SCC and milk quality.