DR. CURT E. HARPER
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Blood, Urine, Oral Fluid, and Hair Drug Testing Interpretation

Translating complex toxicology results into clear, reliable insights
Drug testing plays a vital role in legal, workplace, and medical settings, but understanding the results requires expert interpretation. Different sample types—blood, urine, oral fluid, and hair—each provide unique insights into drug use, timing, and patterns of exposure.
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  • Blood testing reflects recent drug or alcohol use and is often used in cases involving impairment or DUI/DUID investigations.
  • Urine testing detects a wider range of substances over time and is commonly used for workplace or hospital screenings.
  • Oral fluid testing provides real-time information about recent drug use and is less invasive than blood collection.
  • Hair testing reveals long-term drug use history, offering valuable information for chronic exposure cases or child endangerment investigations.
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Accurate interpretation requires considering detection windows, metabolism, dosage, timing, and individual physiology. A proper analysis helps distinguish between one-time use, chronic use, or potential accidental exposure,making it a crucial element in both legal and clinical decision-making.
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DR CURT E. HARPER

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