Cannabis in Urine Levels Chart: How to Read THC Test Results

There is no single cannabis in urine levels chart that applies to everyone. A chart typically compares nanograms per milliliter (ng/mL) of THC metabolite against common test cutoffs, such as the 50 ng/mL screening threshold used in many US workplace drug tests. Your own result depends on how often you use, your metabolism, body fat, and hydration.

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What a cannabis urine levels chart measures

Urine tests do not look for THC itself. They look for THC-COOH, a metabolite your body creates after cannabis use. Labs report this metabolite in ng/mL. A cannabis in urine levels chart puts those numbers next to cutoffs so you can see whether a sample would screen positive or negative.

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Common cutoffs on a cannabis urine test chart

Most charts start with the screening cutoff. If a sample is at or above that number, it goes to confirmation testing. Confirmation uses a more precise method and a lower cutoff. Common US workplace cutoffs include:

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• 50 ng/mL for the initial immunoassay screen
• 15 ng/mL for the confirmatory test

Some labs, employers, and legal programs use different cutoffs. A chart from one lab may not match another. Always check the cutoff printed on the test result.

Why a chart cannot predict your exact detection time

Two people can use the same amount and show very different urine levels. A chart based on average data cannot account for:

• Frequency of use: daily use usually leads to higher and longer-lasting levels than one-time use.
• Body fat: THC metabolites are stored in fat and released over time.
• Metabolism: liver enzyme activity and age affect how fast you clear metabolites.
• Hydration: drinking a lot of water can dilute urine and lower ng/mL, but labs may flag dilute samples.
• Product potency: concentrates and high-THC products can raise levels.
• Time since last use: levels fall after you stop, but the drop is not a straight line.

How to read detection window estimates

Clinical resources often describe general detection windows rather than exact numbers. For occasional use, urine may test negative within a few days. For regular use, it can take weeks. For heavy long-term use, it can take longer. These are estimates, not guarantees. A cannabis in urine levels chart can show you the cutoff, but it cannot tell you your personal clearance date.

What to do with your result

If you have a urine test result and want to understand the number, compare it to the cutoff on the lab report. Do not rely on online charts for a medical or legal decision. A lab professional or your doctor can explain what the result means for your situation. Hydrating before a test can lower concentration, but it can also create a dilute sample that may be rejected.

Bottom line

A cannabis in urine levels chart is a reference tool, not a personal predictor. It shows ng/mL against cutoffs like 50 ng/mL for screening and 15 ng/mL for confirmation. Detection times vary by use pattern, body fat, metabolism, and hydration. Use the chart to understand the test, not to estimate your exact clearance day.