---
title: "Steroid Detection Times and Drug Testing"
description: "Detection time tables by compound, ester impact, what it means for tested athletes and informed users."
lang: en
dateModified: 2026-05-23
canonical: https://anaprotokol.com/en/guides/steroid-detection-times
---

# Steroid Detection Times and Drug Testing

The **detection time** of a substance is the window during which it (or its metabolites) can be identified in a biological sample — usually urine, sometimes blood. It is a different number from the half-life: a compound can have a half-life of a few days and stay detectable for months, because the metabolites excreted at trace concentrations remain identifiable by modern analytical methods (gas chromatography / liquid chromatography coupled with mass spectrometry — GC-MS / LC-MS, and increasingly isotope ratio mass spectrometry, IRMS, for synthetic vs endogenous testosterone discrimination).

This guide gathers the common detection times by compound, explains the role of esters in the detection window, and lays out the framework of anti-doping testing — WADA (World Anti-Doping Agency) globally, USADA in the US, UKAD in the UK, CCES in Canada, ASADA / Sport Integrity Australia. In-competition versus out-of-competition. It complements the broader framework of [harm reduction on steroids](/en/guides/harm-reduction-steroids) for athletes who face any realistic testing risk.

## Detection time vs half-life: two different numbers

A compound's half-life describes the time required for its blood concentration to drop by half. It governs the duration of biological effect and the timing of [PCT (post-cycle therapy)](/en/guides/pct-protocol-guide). Detection time, on the other hand, depends on the sensitivity of analytical methods: a metabolite excreted at vanishingly low concentrations can remain identifiable long after blood levels have dropped to background [2]. The [half-life calculator](/en/calculators/half-life) is for planning cycles and PCT; it says nothing about anti-doping detection windows.

### The role of the ester

For injectable steroids, it is the parent molecule (testosterone, nandrolone, trenbolone, etc.) that gets detected through its metabolites — not the ester itself. A long ester nonetheless stretches the detection window, simply because it prolongs the release of the active molecule: [testosterone propionate](/en/molecule/test-propionate) has a shorter detection time than [testosterone enanthate](/en/molecule/test-enanthate), not because the testosterone is different, but because it keeps being released for longer in the second case.

> For ester-free compounds (oral steroids, SARMs, peptides), only the intrinsic excretion window matters. Injectable esters are the only family where the choice of ester directly drives the detection duration. Note also that endogenous testosterone gets a different treatment: the T:E ratio (testosterone to epitestosterone) is the primary screen, and IRMS confirms synthetic vs endogenous origin.

## Table — injectable steroids

Indicative values, drawn from AnaProtoKol molecule pages (the **detectionTime** field). Variations depend on lab sensitivity, dose, and duration of use.

| Compound | Detection time |
| --- | --- |
| Testosterone Enanthate | 3 months |
| Testosterone Cypionate | 3 months |
| Testosterone Propionate | 2 months |
| Sustanon 250 (blend) | 3 months |
| Testosterone Undecanoate (Nebido) | 3 months |
| Testosterone Suspension (aqueous) | 2 weeks |
| Nandrolone Decanoate (Deca) | 18 months |
| Nandrolone Phenylpropionate (NPP) | 12 months |
| Trenbolone Acetate | 5 months |
| Trenbolone Enanthate | 5 months |
| Trenbolone Hexahydrobenzylcarbonate (Parabolan) | 5 months |
| Boldenone Undecylenate (EQ) | 5 months |
| Masteron Enanthate | 3 months |
| Masteron Propionate | 3 weeks |
| Primobolan Enanthate | 5 weeks |

> [Nandrolone decanoate](/en/molecule/nandrolone-deca) has the longest detection window among common compounds — up to 18 months [3]. Any athlete who faces realistic testing (federated competition or out-of-competition random testing under WADA) needs to factor this into compound selection.

## Table — oral steroids

| Compound | Detection time |
| --- | --- |
| Oxandrolone (Anavar) | 3 weeks |
| Stanozolol (Winstrol) | 3 weeks |
| Methandrostenolone (Dianabol) | 6 weeks |
| Oxymetholone (Anadrol) | 8 weeks |
| Turinabol | 12 months |
| Methasterone (Superdrol) | 3 weeks |
| Fluoxymesterone (Halotestin) | 2 months |
| Mesterolone (Proviron) | 5 to 6 weeks |
| Methenolone Acetate (Primobolan oral) | 4 to 5 weeks |

The trickiest case among orals is [turinabol](/en/molecule/turinabol): its short biological half-life (16 hours) contrasts with a detection window in the order of 12 months, inherited from long-lasting metabolites identified by modern methods. That is the window on which many athletes were retroactively flagged years after use (notably the 2008 and 2012 Olympic sample reanalyses) [1].

## Table — SARMs, peptides, and others

| Compound | Detection time |
| --- | --- |
| Ostarine (MK-2866) | 4 weeks |
| LGD-4033 (Ligandrol) | 3 weeks |
| RAD-140 (Testolone) | 2 weeks |
| Cardarine (GW-501516) | 40 days |
| S4 (Andarine) | 6 to 8 weeks |
| S23 | 6 to 8 weeks |
| YK-11 | 4 to 6 weeks |
| SR9009 (Stenabolic) | Not listed (rev-erb) |
| MK-677 (Ibutamoren) | Not detected (secretagogue) |
| HGH (somatropin) | 24 to 36 hours (isoform method) |
| Peptides (BPC-157, TB-500, GHRP, CJC-1295) | Not routinely detected |
| IGF-1 LR3 | Not routinely detected |
| Clenbuterol | 4 days |
| Ephedrine | 2 to 3 days |
| Anastrozole, Exemestane, Letrozole | 2 weeks |
| Nolvadex, Clomid | Weeks |
| HCG | 2 to 3 weeks |

> All SARMs have been on the WADA prohibited list since 2008, including those with short detection windows ([RAD-140](/en/molecule/rad140), [LGD-4033](/en/molecule/lgd-4033)). A short detection window does not mean the compound is allowed — a positive test means suspension regardless of the detected amount.

## The WADA framework: in-competition and out-of-competition

WADA (the World Anti-Doping Agency) publishes the global Prohibited List every year. All international sports federations and national agencies adhere to it — USADA in the US, UKAD in the UK, CCES in Canada, ASADA / Sport Integrity Australia, NADO Italia in Italy, NADA in Germany, AFLD in France. The list draws a sharp line between two testing contexts.

### In-competition

In-competition testing covers substances banned 'in-competition' — which includes anabolic steroids, SARMs, growth factors, peptides, diuretics and masking agents, but also stimulants (high-dose caffeine, ephedrine, clenbuterol), cannabinoids, and narcotics. The in-competition window generally starts the day before the event and ends after the event concludes.

### Out-of-competition

Out-of-competition testing (no-notice, at home, at training camp) covers only substances banned at all times — essentially anabolic steroids, SARMs, peptide hormones (HGH, IGF, gonadotropins), hormone manipulators (anti-estrogens, AIs, SERMs), and banned methods (transfusion, gene manipulation). This is where the long detection windows (nandrolone decanoate, turinabol) become decisive — an athlete can test positive months after a cycle.

> Top-tier athletes are subject to the ADAMS 'whereabouts' system: continuous declaration of their location to allow surprise testing. Three missed tests in a year trigger suspension. WADA also runs a **biological passport** program: longitudinal monitoring of hematological and endocrine markers — sustained shifts can flag doping even without a positive substance test. This is the system that makes long detection windows operationally effective.

## Practical stakes for athletes who face testing

For a non-competitor (or a competitor in a non-tested federation — open powerlifting, untested bodybuilding, untested strongman), detection time has no practical stake. For anyone licensed in a federation affiliated with WADA, or potentially subject to testing (national-level tested powerlifting, track and field, cycling, swimming, professional MMA, NCAA athletics, Olympic-track sports), the tables above become decisive in compound selection.

### Consequences for compound choice

- Avoid compounds with very long detection windows ([nandrolone decanoate](/en/molecule/nandrolone-deca), [turinabol](/en/molecule/turinabol)).
- Favor short esters that clear quickly after the last injection.
- Plan PCT plus a multi-month "clean" window before any tested competition.
- Understand that peptides and MK-677, not routinely tested, are still not 'allowed' compounds: their use remains classified as doping and is liable to sanction if detected by a dedicated method.

> No detection window should be read as a 'safe window' to evade testing. Analytical methods evolve, thresholds drop, and certain long-lived metabolites get identified retroactively (see the Olympic sample reanalyses). This guide is strictly informational on the order of magnitude of published values; it is not a how-to for evading testing, and AnaProtoKol does not endorse that aim.

## FAQ

### Why is nandrolone decanoate detectable for so long?

Because nandrolone metabolites — notably 19-norandrosterone — are stored in adipose tissue and released progressively, at trace concentrations that modern GC-MS / LC-MS methods can identify for 12 to 18 months after the last dose. The decanoate ester, very long, also extends the initial release window. Nandrolone is the textbook example of a compound where biological half-life (a few days) and detection time (over a year) diverge dramatically [3].

### Are MK-677 and peptides really undetectable?

'Undetectable' is inaccurate — 'not routinely detected' is the right framing. MK-677, an oral GH secretagogue, has no targeted test in routine anti-doping practice. Peptides (BPC-157, TB-500, GHRP, CJC-1295) have short half-lives and do not leave characteristic metabolites exploitable by standard methods. But use of any substance on the WADA list is still considered doping, and samples can be frozen and reanalyzed years later with a method developed in the meantime. The absence of a current test is not a permanent guarantee.

### What is the difference between WADA, USADA, UKAD, and ASADA?

WADA (the World Anti-Doping Agency) is the global body that publishes the Prohibited List. The national agencies — USADA in the US, UKAD in the UK, CCES in Canada, ASADA / Sport Integrity Australia, and similar agencies in every other adhering country — apply the WADA list and organize testing in their jurisdictions. All international federations (UCI for cycling, World Athletics, FINA for swimming, etc.) apply the WADA list through their own testing apparatus. NCAA in the US runs a separate but largely parallel list for college athletes.