At Harris County Diagnostic Testing Services, we don’t just conduct tests — we deliver clarity, peace of mind, and trusted answers when they matter most. Specializing in everything from DNA testing, immigration testing, gender reveal services, occupational health screenings, fingerprinting, and notary support. Our goal is to empower individuals, families, and businesses with reliable, confidential, and timely results.

With a strong focus on accuracy, discretion, and professional excellence, we’re proud to be your dependable partner in health, legal identity verification, and personal decision-making. Whether you're navigating an occupational health screening, preparing for a pre-employment evaluation, need support with drug and alcohol testing or DOT physical exams, our team is here to serve with care and competence.

Our Mission

To deliver precise, confidential, and reliable diagnostic services including DNA testing, immigration testing, gender reveal, fingerprinting, and occupational health screenings that empower individuals, families, and businesses to make informed decisions swiftly, securely, and with complete peace of mind.

What We Offer

We specialize in a full range of diagnostic solutions, including:

• DNA Testing

  • Paternity, maternity, sibling, avuncular and grandparent testing

  • Legal and non-legal testing options

  • Immigration and ancestry DNA services

  • Gender Reveal

  • Infidelity

  • Twin Zygosity

• Fingerprinting Services

  • Live scan and ink card fingerprinting

  • Employment, licensing, background checks, and more

• Occupational Health Screenings

  • Hearing & Vision

  • Immunizations

  • Physical Evaluations

  • Respiratory & Pulmonary Function

  • Tuberculosis

  • X-rays

All services are conducted with a strong focus on compliance and privacy.

Mobile & In-Office Convenience

Whether you're an individual, a family, or a business, we make testing accessible, efficient, and stress-free.

Need us to come to you? Our mobile team provides on-site service at your home, workplace, or legal facility, offering DNA testing, immigration testing, gender reveal, notary, and drug & alcohol testing with full discretion.

Prefer a private and professional environment? Visit our secure, fully equipped office for services such as fingerprinting, occupational health screenings, pre-employment evaluations, hearing & vision testing, immunizations, physical exams, and DOT physicals all conducted by licensed professionals who prioritize your privacy and comfort.

Wherever you choose to test, you’ll receive fast turnaround, expert support, and confidential service every step of the way.

Why Choose Us?

• Certified Professionals: Every test is handled by trained, licensed collectors and clinicians.

• Fast Turnaround: Get results quickly, without sacrificing accuracy.

• Strict Confidentiality: Your privacy is our priority — from start to finish.

• Unmatched Support: We’re here to guide you through the entire testing process, answering every question along the way.

Serving Harris County & Beyond

Proudly serving Harris County and neighboring communities, we're dedicated to providing the kind of dependable diagnostic services you can trust — when timing and trust matter most.