Silica Testing & Monitoring

Medical surveillance is required for workers exposed to respirable crystalline silica at or above the action level of 25 μg/m³ for 30 or more days per year. Industries and occupations with the highest exposure risk include:

• Construction — cutting, grinding, drilling, or demolishing concrete, stone, brick, block, and mortar. Tuck-pointing, concrete finishing, and highway/bridge work are particularly high-exposure tasks
• Oil and gas — hydraulic fracturing (fracking) operations that use silica sand as a proppant, along with sand handling and transfer operations
• Mining and quarrying — extraction and processing of sand, gravel, stone, and other silica-containing materials
• Glass manufacturing — production processes that involve silica sand as a raw material
• Foundries — casting operations that use silica-based molds and cores
• Sandblasting and abrasive blasting — surface preparation and finishing operations using silica-containing abrasives
• Petrochemical and refinery maintenance — refractory work, catalyst handling, and maintenance operations involving silica-containing materials

In Southeast Texas, the concentration of petrochemical facilities, refineries, and construction activity along the Gulf Coast creates a particularly large population of workers who require silica medical surveillance. From the refinery complexes of Port Arthur and Beaumont to the construction boom across the Houston metro, thousands of Texas workers are exposed to crystalline silica as part of their daily work.

The OSHA silica standards specify the components that must be included in a medical surveillance examination. At Hybrid Health Clinics, our silica medical surveillance program includes:

• Occupational history questionnaire — detailed assessment of current and past silica exposure, job tasks, duration of exposure, use of respiratory protection, and history of respiratory symptoms
• Physical examination — comprehensive exam with specific focus on the respiratory system, including lung auscultation, assessment of breathing patterns, and evaluation of signs consistent with silicosis or other silica-related conditions
• Chest X-ray — posteroanterior radiograph interpreted by a NIOSH-certified B-reader. B-reader interpretation is critical for detecting early signs of silicosis and pneumoconiosis that may not be apparent on standard radiology reads
• Pulmonary function testing (spirometry) — measurement of forced vital capacity (FVC) and forced expiratory volume (FEV1) to assess lung function and detect early airflow limitation
• TB testing — tuberculosis screening when indicated, given the increased susceptibility of silica-exposed workers to TB infection
• Additional testing — any further tests deemed appropriate by the examining physician based on individual risk factors and clinical findings

The examining physician provides a written medical opinion to both the employer and the employee, including any recommended limitations on the worker's exposure to silica and whether the worker should be referred for additional evaluation.

OSHA requires an initial (baseline) medical examination within 30 days of initial assignment to a job involving silica exposure at or above the action level, or before assignment if the worker has not had an exam meeting the standard's requirements within the last three years. Periodic examinations are required at least every three years thereafter, or annually if recommended by the examining physician based on clinical findings.

Hybrid Health Clinics supports Texas employers with a complete silica medical surveillance program that goes beyond the basic exam requirements:

• On-site testing available — our mobile medical team can bring silica surveillance exams directly to construction sites, plants, and facilities, minimizing employee downtime
• Compliance documentation — we provide all required documentation including written medical opinions, examination records, and results organized for OSHA compliance files
• Results reporting — electronic delivery of results to employers with clear fitness determinations and any recommended exposure limitations
• Medical Direction integration — for employers enrolled in our Medical Direction program, silica-related workers' compensation claims are managed proactively from the first report, connecting exposure monitoring data with injury management protocols
• Program design consultation — our occupational health team can help employers establish or improve their silica exposure control and surveillance programs

Employers are legally required under OSHA's Respirable Crystalline Silica Standards (29 CFR 1926.1153 and 29 CFR 1910.1053) to provide medical surveillance at no cost to employees who are exposed at or above the action level. Failure to comply may result in OSHA citations and penalties.