Lab Testing Submission SOP — CannabisResource
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Quality Control
Laboratory Testing

Lab Testing Submission SOP

Sample collection, chain of custody, COA interpretation standards, and compliance testing requirements for all cannabis product types

Critical Testing Requirements

  • • All cannabis products must pass compliance testing before sale (potency, pesticides, microbials, heavy metals, solvents)
  • • Use only state-licensed testing laboratories (verify license status before submission)
  • • Maintain chain of custody documentation for all samples (required for audit trail)
  • • Samples must be representative of entire batch (composite sampling for large batches)
  • • Failed tests require batch quarantine and may require destruction (no remediation in most states)
  • • COAs must be retained for 7 years and available to regulators upon request

Required Testing by Product Type

Flower

Full Compliance Panel

  • Potency: THC, THCA, CBD, CBDA, CBN, CBG (minimum 6 cannabinoids)
  • Pesticides: 21-66 analytes depending on state (myclobutanil, imidacloprid, abamectin, etc.)
  • Microbials: Total yeast/mold, E. coli, Salmonella, Aspergillus (4 species)
  • Heavy Metals: Lead, arsenic, cadmium, mercury
  • Moisture Content: Typically 5-15% acceptable range
  • Water Activity: ≤0.65 aw to prevent mold growth
Concentrates

Full Panel + Residual Solvents

  • All flower tests PLUS:
  • Residual Solvents: Butane, propane, hexane, heptane, ethanol, acetone, isopropanol, methanol
  • Action Limits: Butane/propane 5,000 ppm, hexane 290 ppm, benzene 2 ppm (typical)
  • Foreign Material: Visual inspection for hair, insects, packaging material
Edibles

Full Panel + Homogeneity

  • All flower tests PLUS:
  • Homogeneity Testing: 10-unit sample to verify consistent dosing (±15% variance typical)
  • Nutritional Info: Calories, fat, carbs, protein (if required by state)
  • Allergen Testing: Nuts, dairy, soy, gluten (if applicable)
Vape Cartridges

Full Panel + Vitamin E Acetate

  • All concentrate tests PLUS:
  • Vitamin E Acetate: Must be non-detect (banned in most states post-EVALI crisis)
  • Heavy Metals (Enhanced): Additional testing for cartridge hardware leaching
  • Terpene Profile: Required in some states for vape products

1Laboratory Selection & Qualification

State Licensing Requirements

  • Verify lab holds active state cannabis testing license (check state authority website)
  • Confirm lab is ISO/IEC 17025 accredited (international quality standard)
  • Review lab's scope of accreditation (which tests are accredited)
  • Check for any disciplinary actions or license suspensions
  • Verify lab is independent (no ownership ties to cultivators/manufacturers)

Lab Qualification Checklist

  • Turnaround Time: 3-7 business days typical (expedited available?)
  • Pricing: $150-$480 per full panel (compare 3+ labs)
  • Sample Drop-Off: Convenient location or courier service available
  • Reporting: Online portal access, email notifications, COA format
  • Customer Service: Responsive to questions, clear communication
  • Capacity: Can handle your testing volume (especially during harvest season)

Establish Lab Account

  • Submit business license and cannabis license copies
  • Complete lab's client application and service agreement
  • Set up payment terms (credit card, NET 15/30, prepaid account)
  • Designate authorized sample submitters (names, signatures)
  • Configure online portal access and notification preferences

2Sample Collection Procedures

Sample Size Requirements

  • Flower: 7-14 grams (varies by state and lab)
  • Concentrates: 2-5 grams
  • Edibles: 10 units for homogeneity testing + 2 units for compliance
  • Vape Cartridges: 2-3 units (1 for testing, 1 for retention)
  • Tinctures/Oils: 10-20 mL
  • Always collect extra sample for retention and potential retesting

Composite Sampling (Large Batches)

For batches over 10 lbs (flower) or 1,000 units (edibles), collect composite sample:

  • Divide batch into equal sections (minimum 4 sections)
  • Collect equal-sized sub-samples from each section
  • Combine sub-samples into single composite sample
  • Mix thoroughly before submitting to lab
  • Document sampling locations and method

Sample Handling & Storage

  • Use clean, sterile containers (lab-provided or food-grade)
  • Label containers with batch number, product name, date collected
  • Store samples in cool, dark location until submission (within 24-48 hours)
  • Avoid contamination (wear gloves, use clean tools)
  • Do not open or handle samples unnecessarily
  • Maintain samples at proper temperature (refrigerate if required)

Sample Collection Documentation

  • Record batch number, product name, and quantity sampled
  • Document sampling method (random, composite, stratified)
  • Note date, time, and person who collected sample
  • Photograph sample collection process (recommended)
  • Retain documentation with batch records (7-year retention)

3Chain of Custody & Sample Submission

Chain of Custody Form (Required Elements)

  • Client Information: Company name, license number, contact person, phone/email
  • Sample Information: Batch/lot number, product name, product type, sample ID
  • Tests Requested: Potency, pesticides, microbials, heavy metals, solvents (check all that apply)
  • Sample Quantity: Weight or unit count submitted
  • Collection Date/Time: When sample was collected
  • Relinquished By: Name and signature of person submitting sample
  • Received By: Name and signature of lab personnel accepting sample
  • Date/Time Received: When lab received sample

Sample Submission Methods

Drop-Off (Most Common)

  • Deliver sample to lab during business hours (typically 8am-5pm)
  • Bring completed chain of custody form
  • Lab personnel will inspect sample and sign COC form
  • Obtain copy of signed COC form for your records

Courier Service

  • Use licensed cannabis courier (required in most states)
  • Package sample securely with COC form inside
  • Seal package with tamper-evident tape
  • Track delivery and confirm receipt with lab

Lab Pickup (If Available)

  • Schedule pickup with lab (may have minimum order or fee)
  • Have sample and COC form ready at scheduled time
  • Lab courier will sign COC form upon pickup

Sample Acceptance Criteria

Lab will reject samples that do not meet these criteria:

  • Insufficient sample quantity for requested tests
  • Damaged or compromised packaging (broken seal, leaking)
  • Missing or incomplete chain of custody form
  • Sample not properly labeled (batch number, product name)
  • Sample temperature outside acceptable range (if applicable)
  • Visible contamination or foreign material

4Certificate of Analysis (COA) Interpretation

COA Required Elements

  • Lab Information: Name, license number, address, contact info
  • Client Information: Company name, license number
  • Sample Information: Batch/lot number, product name, sample ID, date received
  • Test Results: All requested tests with results and units
  • Pass/Fail Status: Clear indication for each test category
  • Action Limits: Regulatory limits for each analyte
  • Methods Used: Testing methodology (HPLC, GC-MS, etc.)
  • Analyst Signature: Name and signature of reviewing scientist
  • Date Issued: When COA was finalized

Understanding Potency Results

  • THCA vs. THC: THCA converts to THC when heated (multiply THCA by 0.877 to get potential THC)
  • Total THC: THC + (THCA × 0.877) = total psychoactive potential
  • CBD vs. CBDA: Same conversion applies (CBDA × 0.877 = CBD)
  • LOQ (Limit of Quantification): Lowest amount lab can accurately measure
  • ND (Non-Detect): Below LOQ, essentially zero
  • Variance: ±10-15% variance between batches is normal

Pass/Fail Criteria

Pesticides

All analytes must be below action limits (0.1-2.0 ppm typical). Single failure = batch fails.

Microbials

E. coli and Salmonella must be non-detect. Total yeast/mold typically ≤10,000 CFU/g. Aspergillus non-detect.

Heavy Metals

Lead ≤0.5 ppm, arsenic ≤0.2 ppm, cadmium ≤0.2 ppm, mercury ≤0.1 ppm (typical limits).

Residual Solvents

Butane/propane ≤5,000 ppm, hexane ≤290 ppm, benzene ≤2 ppm (typical limits).

COA Red Flags (Quality Issues)

  • Results near action limits (even if passing) indicate quality control issues
  • High total yeast/mold (even if below limit) suggests storage problems
  • Unusual cannabinoid ratios may indicate mislabeled strain
  • Missing required tests or incomplete data
  • COA not signed by qualified analyst
  • Lab license expired or not listed on COA

5Failed Test Response & Retesting

Immediate Actions Upon Test Failure

  • Quarantine entire batch in tracking system (METRC/BioTrack) immediately
  • Physically segregate failed product from other inventory
  • Notify state cannabis authority within 24 hours (required in most states)
  • Document failure in batch records
  • Investigate root cause (contamination source, process failure)
  • Do NOT sell, transfer, or process failed product

Retesting Options (State-Dependent)

Same Lab Retest

  • Request retest of retained sample (if available)
  • Lab may retest at no charge if failure suspected to be lab error
  • Results typically available within 24-48 hours

Third-Party Retest

  • Submit new sample to different licensed lab for confirmation
  • Allowed in some states (CA, CO) if results are disputed
  • If second lab passes, may need state authority to adjudicate

Remediation (Limited States)

  • California and Michigan allow remediation for some failures
  • Typically limited to microbial failures (not pesticides or heavy metals)
  • Methods: CO2 extraction, ethanol extraction (removes contaminants)
  • Remediated product must be retested and pass before sale

Batch Destruction (Most Common Outcome)

  • Most states require destruction of failed batches (no remediation)
  • Follow state waste disposal procedures (grinding, mixing with non-cannabis waste)
  • Document destruction with photos, witness signatures, waste manifest
  • Update tracking system with destruction records
  • Submit destruction report to state authority
  • Retain all documentation for 7 years

Corrective Actions

  • Investigate root cause (supplier issue, process contamination, equipment failure)
  • Implement corrective actions (change suppliers, improve sanitation, upgrade equipment)
  • Increase testing frequency for next 3-5 batches to verify corrective actions
  • Document all corrective actions in quality management system
  • Train staff on updated procedures

6COA Management & Compliance

COA Storage & Retention

  • Store COAs electronically (PDF) and link to batch records in tracking system
  • Maintain physical copies in batch files (recommended backup)
  • Retain all COAs for 7 years (regulatory requirement)
  • Organize by batch number and date for easy retrieval
  • Ensure COAs are accessible to regulators during inspections

COA Availability Requirements

  • Wholesale Customers: Provide COA with every transfer (email or physical copy)
  • Retail Customers: Display COAs in-store or provide QR code to access online
  • Online Sales: Post COAs on website or product pages
  • Regulators: Provide COAs upon request during inspections or audits

COA Verification (For Purchasers)

  • Verify lab license is active on state authority website
  • Confirm batch number on COA matches product packaging
  • Check that all required tests are included and passed
  • Verify COA is signed by qualified analyst
  • Confirm COA date is recent (within 6-12 months typical)
  • Contact lab directly if COA authenticity is questioned

Document Information

Last Updated: January 2026

Version: 2.8

Reviewed By: Cannabis Quality Control & Laboratory Testing Team

This SOP is a general template. State testing requirements vary significantly. Consult your state cannabis authority's testing regulations and work with licensed laboratories to ensure full compliance. Maintain detailed records of all testing activities for regulatory audits.

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