​​About Hair Testing:

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We offer different cut-off levels for some drugs; if you are looking for something specific, please email us at Office@ProResultsAustin.com

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• Detection Window: Drugs remain in hair until it grows out or is cut off. Head hair detects use up to 90 days, body hair 6–12 months.

• Sample Size: Requires 120–200 head hairs (thickness of a Sharpie) or a large cotton ball of body hair.

• Time Frame: Testing can cover 30 days to 1 year, depending on sample type and segmenting. 30-day segments are available for select panels.

• Hair Growth Rate: Head hair grows ~½ inch per month. Testing typically reflects usage from 14 days before collection and looks back 90 days.

• Drug Incorporation: Takes 10–14 days post-use for drugs to appear in hair/nails. For a potential negative result, wait 2 weeks + 90 days after last use before testing.

• Segmentation: Only head hair can be segmented for specific time frames. Body hair and nails cannot. Segmentation allows specific results from each 30day timeline as a look into monthly usage.

• Body Hair Growth: Grows and sheds irregularly, not trimmed like head hair. Detection window: 6–12 months.

• Testing Process: Positive screenings proceed to confirmation testing using GC/MS and/or LC/MS/MS. These cannot determine time, dose, or frequency of use.

• Confirmation Methods:

  • GC/MS – Gas Chromatography/Mass Spectrometry

  • LC/MS/MS – Liquid Chromatography–Tandem Mass Spectrometry (detects more compounds, minimal prep).

• Panel Tests: Often include multiple drugs per category (e.g., Opiates, Benzodiazepines, Amphetamines).

• EtG Alcohol Hair Test: Detects regular alcohol use up to 90 days; 30-day segmentation available.​​​​​​​​​​​​​