Detection-Time Estimator
Estimate how long an anabolic compound stays detectable after the last dose.
Not medical advice, and not a tool to evade testing. Detection times vary enormously by dose, duration of use, metabolism, route, and the specific assay. This is a half-life-based pharmacokinetic estimate only. Competing while a substance is prohibited, or using this to time use around testing, violates anti-doping rules and can endanger your health.
Half-life: 0.3 days · Typical dose 25.0 mg–100.0 mg · Injectable (7× half-life)
Detection window
PK model estimate
~0.3 wks · 7× half-life · until ~Jul 23, 2026
Published detection window(GC-MS/MS)
3–6 wks · metabolite: 18-nor-17β-hydroxymethyl-17α-methyl-5α-androst-13-en-3α-ol · until Aug 11, 2026–Sep 1, 2026
Sobolevsky & Rodchenkov, Drug Test Anal 2012Novel long-term metabolites detectable ≥14 days via GC-MS/MS. Earlier metabolites cleared within 5–7 days.
How this is computed. The PK model estimate multiplies the half-life by 7× (0.3 days) for injectable compounds — a convention approximating metabolite clearance. The published window above is sourced from anti-doping literature targeting specific long-lived metabolites — typically longer because those metabolites persist well beyond the parent compound. Actual detection depends on dose, duration, metabolism, and the specific assay.
Published windows are typically longer than the half-life model because anti-doping assays target metabolites that persist substantially beyond the parent compound. Consult WADA's Prohibited List and a qualified anti-doping professional.
Educational use only — not medical advice and not guidance for evading anti-doping controls. Estimates are half-life-based (7× injectable, 5× oral) and do not account for dose, duration, individual metabolism, or specific assay sensitivity.
About this tool
The detection-time estimator calculates how long an anabolic compound stays detectable in anti-doping testing after the last dose. For compounds with published data, it shows two windows side-by-side: a half-life-based model estimate and a literature-sourced detection window targeting the specific long-lived metabolites that WADA-accredited labs actually test for.
How to use it
- 1 Select a compound from the anabolic dataset.
- 2 Enter the date of your last dose.
- 3 Read the PK model estimate (half-life × 5–7× multiplier).
- 4 Where available, compare it against the published detection window (metabolite + assay + source).
Frequently asked questions
Why are the two windows different?
The model estimate uses a simple half-life multiplier. The published window is sourced from anti-doping literature and targets specific long-lived metabolites (e.g. testosterone enanthate's epimetendiol, nandrolone's 19-norandrosterone) which persist far longer than the parent compound — so the literature window is typically longer.
Can I use this to pass a drug test?
No, and it is not designed for that. Detection times vary enormously by dose, duration of use, metabolism, route, and the specific assay. Using this information to time use around testing violates anti-doping rules. This is educational content about pharmacokinetics and metabolite clearance.
Why does nandrolone have such a long detection window?
Nandrolone decanoate (Deca) produces 19-norandrosterone metabolites that can be detected for 12–18 months — among the longest of any anabolic steroid. This is why nandrolone positives are so common in tested athletes long after a cycle ends.
Educational use only — not medical advice. Results are estimates based on published formulas and models.