Understanding fentanyl test strips

Understanding False Negatives & False Positives

What causes inaccurate results with fentanyl test strips — from dilution errors to the hook effect — and how to minimize them.

Clinical5 min

Beyond Fentanyl — Nitazenes, Medetomidine & the Evolving Drug Supply

The next wave of synthetic opioids and adulterants entering the drug supply, what they mean for detection, and how testing must adapt.

How to Test Pills for Fentanyl: The Chocolate Chip Cookie Problem

Fentanyl is not evenly distributed in pressed pills. Why you must crush the entire pill, and step-by-step testing protocol.

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Fentanyl Analogs Explained

Why there are 100+ variants of fentanyl in the drug supply, how they differ structurally, and why detection is challenging.

Technology5 min

Broad-Spectrum vs. Single-Antibody Detection

A deep technical comparison of single-antibody and broad-spectrum cocktail approaches to fentanyl analog detection.

How to Use Fentanyl Test Strips

Step-by-step instructions for both SC-1 manual kits and SC-X handheld analyzers, with result interpretation guidance.

What to Do After a Positive Result

Harm reduction guidance for when a test detects fentanyl — safer use practices, naloxone readiness, and how to reduce overdose risk.

Procurement5 min

Grant Funding for FTS Programs

Which federal and state grants cover fentanyl test strips, how to write them into your budget, and common pitfalls.

Reading FTS Results Correctly

How to interpret test strip results — what one line vs. two lines means, handling ambiguous results, and reading through the SC-X magnification window.

Operations5 min

Starting a Fentanyl Test Strip Program from Scratch

End-to-end guide covering needs assessment, stakeholder buy-in, funding, supplier selection, distribution model, training, and launch.

Operations5 min

Managing Test Strip Inventory & Expiration

FIFO rotation, shelf life management, storage conditions, expiration alerting, and waste documentation for grant reporting.

Operations5 min

Measuring FTS Program Outcomes for Grant Reporting

What metrics to track, how to collect field data, structuring reports for CDC OD2A and SAMHSA SOR, and building a logic model.

Distribution5 min

Centralized vs. Decentralized vs. Hybrid Distribution

Three distribution models explained with pros, cons, decision criteria, and guidance on when to switch models.

Distribution5 min

Reaching Underserved Populations with FTS

Strategies for rural, tribal, immigrant, incarcerated, and houseless populations — mobile outreach, cultural competency, and language access.

Clinical5 min

Fentanyl Contamination of Stimulant Drugs

Why fentanyl is increasingly found in methamphetamine and cocaine, and why stimulant users are at particular risk.

Clinical7 min

Xylazine ('Tranq') and Fentanyl Test Strips

What xylazine is, why it's mixed with fentanyl, what FTS can and cannot detect, and wound care implications.

Clinical5 min

Using FTS and Naloxone Together

Why co-distribution matters, dosing considerations for high-potency analogs, and program integration strategies.

Retail5 min

Fentanyl Test Strips for Pharmacies & Retail

Consumer education, shelf placement, staff training, regulatory considerations, and wholesale ordering for pharmacy partners.

Policy5 min

The Evidence Base for Fentanyl Test Strips

Published research, behavior change data, cost-effectiveness studies, and how to cite the evidence in grants and policy memos.

Policy5 min

FTS Within Drug Checking Services

How FTS compare to FTIR spectroscopy, mass spectrometry, and reagent tests — and how they fit into drug checking programs.

Understanding Sensitivity & Specificity in FTS

What sensitivity and specificity mean, how they are validated, and why real-world performance differs from laboratory results.

Technology5 min

How Fentanyl Test Strips Are Manufactured

From antibody production to membrane preparation to quality control — how FTS are built and validated at scale.

Basics5 min

Fentanyl Test Strips vs. Other Drug Checking Methods

How FTS compare to reagent tests, FTIR spectroscopy, and mass spectrometry — cost, accuracy, accessibility, and when each method fits.

Technology5 min

Why Test Strip Design Matters More Than Chemistry

Most test failures trace to human error, not antibody performance. How housing geometry, wick design, and buffer delivery affect real-world accuracy.

Why the Drug Supply Changes Faster Than Testing Can Adapt

The structural advantage clandestine manufacturers hold over diagnostic developers — and what broad-spectrum detection strategies can do about it.

Distribution5 min

FTS in Vending Machines — Unattended Distribution Models

How 24/7 harm reduction vending machines are expanding FTS access, with deployment considerations, equity implications, and program design guidance.

Procurement6 min

How to Write Fentanyl Test Strips Into Your Grant Budget

Sample budget line items, justification templates for CDC OD2A and SAMHSA SOR, and common rejection reasons to avoid.

What Causes False Positives on Fentanyl Test Strips

The dilution rate is everything. How standardized measurement prevents cross-reactivity and what "zero false positive" marketing actually means.

Clinical6 min

Orphines: The Synthetic Opioid Class No Test Strip Can Detect

What orphines are, why they emerged after China's nitazene ban, and what harm reduction programs should do now.