CotCalc: Urine cotinine estimator

Inputs

Results update as you type

1Person

Body weight

Sex

Nicotine metabolism

Hydration at test

2Nicotine use

Patterns repeat every week. Use Exact to set specific days and times.

Pattern started

Start date

I stopped all nicotine

Last use date

After this time

2Past lab result

A quantitative urine cotinine result in ng/mL from a lab report.

Urine cotinine

ng/mL

Test method

Collected on

Lab panels named “nicotine and metabolites, quantitative” (Labcorp, Quest, Mayo) use LC-MS/MS.

3Use around that result

On this pattern since

I stopped this pattern

Last use date

After this time

4Heavier use before that

Optional. Matters if you switched patterns within about a week of the result.

Include earlier heavier use

Assumed long-term, ending the day the pattern above started.

I have a result from this period

Result

Collected on

5Use going forward

What you use now or plan to use. Leave unchecked if you’ve stopped entirely.

Include current or planned use

Starting

3Upcoming test

Test date

Time

Positive cutoff

Custom cutoff

ng/mL

The lab reports a number; whoever orders the test decides what counts as positive. Check the report or program rules.

Estimated urine cotinine report

Model estimate based on the inputs on this page

Estimate only, not a lab result

Specimen: Urine, random
Analyte: Cotinine
Mode: –
Test time: –

Results

Measure	Estimate	Likely range	Flag

Modeled urine cotinine over time

Interpretation

Cutoff reference at test time

Cutoff	Commonly used for	Status at test time