Precision. Accuracy.
Trusted Results.

Valley Scientific delivers rigorous chemical, toxicological, and analytical testing with mobile collection services for industries where accuracy is non-negotiable.

60+
Detectable Compounds
24 hr
Rush Turnaround for Alcohol & Drug Screens
15+
Years of Experience

Who We Are

Precision You Can Trust

Valley Scientific was founded with a single purpose: to deliver accurate, reliable results that are defensible in court. We are an independent analytical laboratory serving industrial, law enforcement, government, and employment testing clients.

Our services include pre-employment testing, walk-in testing, mobile sample pickup, and professional phlebotomy services — providing accessible and timely solutions to meet urgent and routine needs.

Our team of credentialed analytical scientists operates within a state-of-the-art laboratory environment, supported by advanced instrumentation and validated methodologies. Every result we produce is governed by rigorous quality assurance protocols and conducted in accordance with applicable state regulations.

Independent

No commercial bias — our findings serve the data, not a customer outcome.

Qualified

Credentialed scientists with 60+ detectable compounds and state-of-the-art instrumentation.

Responsive

Dedicated client liaisons and 24-hour rush capacity for alcohol and drug screen testing.

Our Services

From routine compliance testing to complex investigative analysis, Valley Scientific offers a full suite of laboratory services tailored to your industry.

Specimen Testing

Comprehensive drug screening services supporting pre-employment and workplace compliance programs. Analysis is performed using validated methodologies to ensure accurate, defensible results aligned with regulatory requirements.

Immunoassay ScreeningGC-MS ConfirmationLC-MS/MSSpecimen Validity Testing

Remote Chromatography & Analytical Support

Remote data analysis and technical support for chromatographic workflows, including LC-MS, GC-MS, and HPLC systems. Services include data review, instrument troubleshooting guidance, method validation support, and quality control documentation to ensure reliable and compliant analytical performance.

LC-MS Data AnalysisGC-MS Data ReviewHPLC Method SupportValidation & QC Documentation

Mobile Collection & On-Site Services

24-hour on-call mobile collection and phlebotomy services providing convenient, professional sample collection at client locations. Rapid response availability supports workplace, legal, and time-sensitive testing requirements with secure specimen handling and documented chain-of-custody procedures.

Mobile Specimen CollectionOn-Site Phlebotomy24/7 On-Call AvailabilityChain-of-Custody Support

Scientific Consulting & Result Interpretation

Professional consulting services providing analytical insight, technical guidance, and interpretation of laboratory findings. Support is available for clients requiring clear, defensible evaluation of analytical reports, methodologies, and quality documentation.

Analytical Report ReviewResult InterpretationTechnical ConsultationRegulatory & QA Guidance

Expert Witness Services

Professional expert witness and litigation support services grounded in scientific integrity, analytical expertise, and defensible methodology. Services include case review, technical consultation, formal reporting, and expert testimony for legal and regulatory matters.

Case Review & EvaluationTechnical Expert TestimonyLitigation SupportForensic Report Analysis

Retesting & Independent Verification

Independent retesting services providing objective analytical review and result verification for clients requiring additional quality assurance or secondary evaluation. Testing is conducted using validated methodologies and rigorous quality control standards.

Independent Result VerificationAnalytical Re-EvaluationQuality Assurance ReviewDefensible Reporting

Why Choose
Valley Scientific

What distinguishes a good laboratory from an essential one.

01

Chain of Custody You Can Trust

Every sample received is logged, tracked, and stored under controlled conditions. Our LIMS provides full audit trails from receipt to final report.

02

Results That Hold Up

Our methods are validated, QC-monitored, and issued with uncertainty estimates. Reports are formatted for direct submission to regulatory bodies.

03

Mobile Sample Pickup & Phlebotomy

We come to you. Our mobile team provides on-site sample collection and professional phlebotomy services, eliminating the need for your employees or clients to travel to a collection facility.

04

Expert Interpretation

You receive more than numbers — you receive context. Our scientists discuss results, flag anomalies, and help you understand what the data means for your application.

Visit or Contact Us

We welcome site visits, sample drop-offs, mobile sample pickups, and consultation appointments. We also offer on-site phlebotomy services. Reach us by phone, email, or the form — we typically respond within one business day.

Address
5407 W. Hillsdale Ave. Visalia, CA 93291
Hours
Mon – Fri: 7:00 AM – 4:00 PM
5407 W. Hillsdale Ave. · Visalia, CA 93291

Send a Message

Questions about services, turnaround times, pricing, or to arrange a sample pickup.