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MDMA is detectable in blood for 24–48 hours after occasional use and up to 72 hours for frequent users. Blood testing detects both parent MDMA and its active metabolite MDA. Peak blood levels occur 1.5–3 hours after oral ingestion, with concentrations declining following a biphasic elimination pattern — a rapid initial drop followed by slower terminal elimination.
MDMA blood pharmacokinetics are characterized by nonlinear dose-response. Due to CYP2D6 auto-inhibition, peak plasma concentrations increase disproportionately with dose. A 125mg dose produces roughly 2× the plasma levels of a 75mg dose, not the expected 1.67× increase. This nonlinearity is clinically significant because it increases toxicity risk with only modest dose escalation.
The biphasic elimination pattern means blood MDMA drops rapidly in the first 6–8 hours (distribution into tissues), then slowly over the next 24–48 hours (hepatic metabolism and renal excretion). The terminal elimination half-life of 6–9 hours means 5 half-lives (30–45 hours) are needed for near-complete clearance.
Blood testing for MDMA is most commonly performed in emergency medical settings (when a patient presents with hyperthermia, serotonin syndrome, or hyponatremia) and in forensic/postmortem cases. It is rarely used for employment or probation screening, where urine testing is standard.
Reach for this calculator when you need a standardised health metric to discuss with a healthcare provider or to use as a baseline for a fitness programme. The result gives you a number that carries more meaning than subjective assessments.
The most common mistake is treating the result as a precise measurement rather than an evidence-based estimate. All body metric calculators have margins of error — use the result as a tracking baseline, not a clinical diagnosis.
A personal trainer uses the calculator with a new client to set a measurable starting point. Re-running the calculation at 4-week intervals provides an objective progress metric that supports motivation and programme adjustments.
Primarily in emergency rooms (overdose, hyperthermia, serotonin syndrome), forensic investigations, and postmortem analysis. Routine screening uses urine, not blood.
Occasional use: 24–48 hours. Frequent use: up to 72 hours. Blood is most useful for confirming very recent use (within the last 24 hours).
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