On Call MDS is a Nevada-based mobile diagnostic and compliance services provider dedicated to supporting employers with comprehensive on-site testing and screening solutions. With 24/7 mobile deployment capabilities across Las Vegas and Clark County, we bring professional diagnostic services directly to your workplace, eliminating the need for employees to travel to testing facilities. Our mission is to help employers maintain a safe, compliant, and healthy workforce while streamlining their compliance processes.

We specialize in serving both DOT-regulated and non-DOT employers with a full suite of services including drug and alcohol testing, biometric screenings, portable 12-lead EKGs, and comprehensive employer program administration. Our experienced team is equipped to handle the unique demands of workplace compliance, ensuring accurate results, regulatory adherence, and minimal disruption to your operations. Whether you need routine screenings or emergency testing, On Call MDS delivers reliable, professional service when and where you need it.