
On Time Specimen Lab LLC is a professional specimen collection and drug testing service provider based in Houston, Texas. We specialize in DOT and Non-DOT drug testing, rapid drug screening (5–28 panels), laboratory specimen collections, breath alcohol testing (BAT), random drug testing programs, and mobile/on-site testing services. We proudly serve employers, trucking companies, warehouses, manufacturing facilities, construction companies, transportation and aviation industries, healthcare facilities, government agencies, legal professionals, schools, and individuals throughout Houston, Harris County, Fort Bend County, and surrounding communities. Our additional services include phlebotomy, DNA and court-ordered DNA testing, fingerprinting, background checks, EKG services, notary services, gender reveal testing, and medical courier services. We also assist businesses with DOT/FMCSA drug and alcohol testing programs, random testing administration, pre-employment screening, post-accident testing, reasonable suspicion testing, return-to-duty and follow-up testing coordination, and Third-Party Administrator (TPA) services. We offer convenient mobile collections, flexible scheduling, rapid screening results, and laboratory testing with results typically available within 24–48 hours, depending on the test and laboratory processing requirements. At On Time Specimen Lab LLC, our mission is to provide dependable, affordable, confidential, and professional services while helping employers maintain safe, drug-free workplaces. We live by our name — On Time, Every Time!
| Monday | 9:00 AM – 7:00 PM |
| Tuesday | 9:00 AM – 7:00 PM |
| Wednesday | 9:00 AM – 7:00 PM |
| Thursday | 9:00 AM – 7:00 PM |
| Friday | 9:00 AM – 7:00 PM |
| Saturday | 7:30 AM – 12:30 PM |
| Sunday | 7:30 AM – 12:30 PM |
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