Home
Back
THC/Creatinine Ratio Formula:
| From: | To: |
The THC/Creatinine Ratio test measures the ratio of tetrahydrocannabinol (THC) to creatinine in urine samples. This ratio helps account for urine dilution and provides a more accurate assessment of recent cannabis use than THC concentration alone.
The calculator uses the simple ratio formula:
Where:
Explanation: The ratio normalizes THC levels against creatinine excretion, providing a more reliable indicator of recent cannabis use that is less affected by urine dilution.
Details: This ratio is particularly important in workplace drug testing, forensic analysis, and clinical settings where accurate detection of recent cannabis use is required. It helps distinguish between recent use and residual excretion from past use.
Tips: Enter THC concentration in ng/mL and creatinine concentration in mg/dL. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is a normal THC/Creatinine ratio?
A: There is no "normal" ratio as this test detects cannabis use. Interpretation depends on the specific cutoff values used by the testing facility.
Q2: Why use creatinine correction?
A: Creatinine correction accounts for urine dilution, making the test results more consistent and reliable across different hydration states.
Q3: How soon after use can THC be detected?
A: Detection windows vary based on frequency of use, metabolism, and other factors. Occasional users may test positive for 1-3 days, while chronic users may test positive for weeks.
Q4: Are there limitations to this ratio?
A: Yes, the ratio may be affected by kidney function, muscle mass, hydration status, and individual metabolic variations.
Q5: What are typical cutoff values?
A: Common screening cutoffs are 50 ng/mL for THC and 20 mg/dL for creatinine, with confirmation cutoffs typically at 15 ng/mL for THC.