Testing & Screening

Audiometry

A hearing test that measures auditory thresholds, used to baseline and monitor workers in hearing conservation programs.

Chain of Custody

The documented, unbroken handling trail for a specimen that keeps drug-test and lab results legally defensible.

The medical examination that certifies a commercial driver is physically fit to operate a commercial motor vehicle.

Screening employees for prohibited substances, whether under DOT rules or an employer's own non-DOT policy.

A specific eye, mouth, mucous-membrane or skin contact with blood or infectious material that triggers medical follow-up.

Medical Review Officer

A licensed physician who reviews and verifies drug-test results, confirming legitimate medical explanations before reporting.

Spirometry

A pulmonary function test that measures how much and how fast a person can breathe, used in respiratory surveillance.

Tuberculosis Screening

Testing for tuberculosis infection — by skin test (PPD) or blood test (IGRA) — common for health-care and at-risk workers.

A blood test that measures antibody levels to confirm immunity to a disease, often accepted in place of revaccination.

Tests of visual acuity, color and depth perception used to confirm fitness for safety-sensitive and regulated roles.