1. What is a Marijuana In System Calculator?

Definition: This calculator estimates how long marijuana metabolites remain detectable in the body based on initial concentration, detection threshold, and half-life.

Purpose: It helps individuals understand approximate detection windows for drug tests.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Time \) — Detection time (days)
• \( Initial \) — Initial THC concentration (ng/ml)
• \( Threshold \) — Test detection threshold (ng/ml)
• \( Half\ Life \) — Half-life of THC metabolites (days)

Explanation: The formula calculates how many half-lives are needed for the concentration to drop below the detection threshold.

3. Factors Affecting Detection Time

Details: Actual detection times vary based on metabolism, body fat, frequency of use, and test sensitivity.

4. Using the Calculator

Tips: Enter the initial THC concentration (ng/ml), test threshold (default 5 ng/ml), and metabolite half-life (default 3 days). Initial must be > threshold.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical half-life for THC metabolites?
A: THC-COOH typically has a half-life of 3-5 days in regular users, but this varies by individual.

Q2: What detection thresholds do tests use?
A: Common thresholds are 50 ng/ml for initial tests and 15 ng/ml for confirmatory tests (5 ng/ml for more sensitive tests).

Q3: How accurate is this calculation?
A: It provides a theoretical estimate. Actual detection depends on many biological factors.

Q4: Does this account for chronic use?
A: No, chronic use leads to accumulation which may extend detection windows significantly.

Q5: Can this predict urine vs. blood test results?
A: This models blood levels. Urine tests detect THC-COOH which has different pharmacokinetics.