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Comprehensive Laboratory Services Survey (CLSS)


The Comprehensive Laboratory Services System (CLSS) is intended to measure the extent to which state public health laboratories (SPHLs) fulfill 11 Core Functions of public health laboratories in support of public health. The survey is distributed biennially to all state health agencies. • Disease Prevention, Control and Surveillance • Integrated Data Management • Reference and Specialized Testing • Environmental Health and Protection • Food Safety • Laboratory Improvement and Regulation • Policy Development • Public Health Preparedness and Response • Public Health Related Research • Training and Education • Partnerships and Communication


Association of Public Health Laboratories (APHL)

Data Years Available

2004, 2006, 2008, 2010, 2012




Sample survey: Internet questionnaire

Selected Content

State public health laboratory performance in areas such as disease surveillance, reference testing, food safety, environmental testing, and emergency response.

Population covered

State public health laboratories in the 50 states and the District of Columbia.


CLSS is a cross-sectional internet survey. Sampling occurs biennially.

Response rate and sample size

In all surveys, the response rates have been 90% or higher.

Interpretation Issues



Wilcke BW JR., et al: Laboratory services in support of public health: a status report. Public Health Reports. 125 (Suppl 2): 40-46. 2010.