Book Cotinine Test: Purpose, Normal Range and Price

Key facts about the Cotinine test
Also Known As	Nicotine Metabolite Test, Tobacco Exposure Test
Sample Type	Blood (Serum)
Fasting Required	No
Report Delivery	Within 24 hours
Age Group	Adults and Children
Gender	All
Test Type	Immunoassay or Liquid Chromatography-Mass Spectrometry (LC-MS)
Units	ng/mL

The Cotinine test is a blood test that measures the level of cotinine, the primary metabolite of nicotine, in the bloodstream. When nicotine enters the body through cigarette smoking, smokeless tobacco use, nicotine replacement therapy, or passive exposure to tobacco smoke, the liver metabolises approximately 70 to 80 percent of absorbed nicotine into cotinine through the action of the cytochrome P450 enzyme CYP2A6. Unlike nicotine itself, which has a very short half-life of approximately one to three hours, cotinine has a significantly longer half-life of 16 to 20 hours, making it a far more stable, sensitive, and reliable biomarker for assessing both active tobacco use and secondhand smoke exposure over a clinically meaningful window of two to four days preceding the test. Cotinine measurement is considered the gold standard biological marker for tobacco exposure, offering significant advantages over self-reported smoking history, which is frequently inaccurate due to underreporting driven by social desirability bias, insurance implications, or employment concerns. The test can accurately distinguish between active smokers, individuals exposed to significant secondhand smoke, users of nicotine replacement products, and true non-smokers with no meaningful nicotine exposure, making it uniquely valuable across clinical, occupational health, insurance, and public health contexts. In India, tobacco use remains one of the most serious public health crises, with over 267 million tobacco users according to the Global Adult Tobacco Survey, encompassing cigarette smokers, bidi smokers, and a vast population of smokeless tobacco users consuming products including gutkha, khaini, and zarda. Secondhand smoke exposure is also widespread in Indian households and workplaces. The Cotinine test provides an objective and legally defensible measure of tobacco exposure that self-reporting cannot match. The test is performed on a small blood sample drawn from a vein and completed in under five minutes.

Doctors prescribe a Cotinine test in the following situations: Confirming tobacco use status before surgical procedures where active smoking significantly increases the risk of postoperative complications including wound infection, impaired healing, respiratory complications, and anaesthetic risk, and where objective cotinine measurement provides accurate smoking status that guides pre-operative counselling and risk stratification beyond unreliable self-reporting. Verifying smoking cessation in patients enrolled in tobacco cessation programmes where objective biochemical confirmation of abstinence through serial cotinine testing provides accurate programme outcome data, motivates patients through objective evidence of progress, and identifies those who require additional cessation support or pharmacological intervention. Assessing secondhand smoke exposure in children, pregnant women, and non-smoking adults where cotinine measurement quantifies the degree of passive nicotine exposure from household or workplace tobacco smoke, informs counselling regarding the health risks of environmental tobacco smoke, and supports medico-legal documentation of exposure in relevant cases. Evaluating nicotine replacement therapy compliance and dosing adequacy in patients using nicotine patches, gums, lozenges, or inhalers for smoking cessation where cotinine levels confirm whether therapeutic nicotine delivery is occurring at appropriate levels to manage withdrawal symptoms while avoiding toxicity from excessive nicotine replacement. Occupational and insurance screening where documentation of tobacco-free status is required for employment in specific industries, eligibility for life insurance or health insurance premium discounts, and compliance with tobacco-free workplace policies, where objective cotinine measurement provides legally defensible evidence of tobacco use or abstinence. Investigating nicotine toxicity in patients with symptoms of nicotine poisoning including nausea, vomiting, dizziness, tachycardia, hypertension, and in severe cases seizures and cardiovascular collapse, where quantitative cotinine and nicotine measurement helps confirm the diagnosis and assess severity in occupational pesticide exposure and accidental ingestion scenarios.

The Cotinine test measures the concentration of cotinine in the blood serum, expressed in nanograms per millilitre (ng/mL). Interpretation thresholds vary slightly between laboratories but the following clinically accepted classification is widely used in practice. The generally accepted reference ranges are below 1 ng/mL for non-smokers with no significant nicotine exposure, 1 to 10 ng/mL for individuals with secondhand smoke exposure or very low level nicotine product use, and above 10 ng/mL for active tobacco users, with regular smokers typically producing levels between 100 and 500 ng/mL depending on smoking intensity and individual metabolic rate. Non-Smoker Range (Below 1 ng/mL) A result below 1 ng/mL indicates no significant nicotine exposure in the preceding two to four days, consistent with a true non-smoker with no meaningful secondhand smoke exposure. This range is the expected finding in confirmed non-smokers and individuals who have successfully abstained from all tobacco and nicotine products for at least four to five days before testing. Secondhand Exposure Range (1 to 10 ng/mL) A result in this range indicates measurable cotinine from passive secondhand smoke exposure or very low-level nicotine product use, without meeting the threshold for active smoking. This finding is clinically relevant in children and pregnant women where even passive exposure carries documented health risks, and warrants counselling regarding household and workplace tobacco smoke reduction measures. Active Tobacco User Range (Above 10 ng/mL) A result above 10 ng/mL confirms active tobacco use or significant nicotine replacement therapy use within the preceding two to four days. Regular smokers typically produce levels of 100 to 500 ng/mL, and the magnitude of elevation broadly correlates with the intensity of tobacco use, though individual metabolic variation in nicotine to cotinine conversion means that absolute levels cannot be directly translated into precise cigarette equivalents.

No fasting is required for the Cotinine test, as food and fluid intake do not affect cotinine concentrations in the blood. The test can be performed at any time of day without any specific dietary restrictions, making it straightforward to schedule as part of a pre-operative assessment, cessation programme monitoring visit, or occupational health screening panel. Inform your doctor about all nicotine-containing products currently being used before the test, including cigarettes, bidis, cigars, smokeless tobacco products, nicotine patches, gums, lozenges, nasal sprays, and electronic cigarettes, as all of these will produce detectable cotinine and are essential context for accurate interpretation of results. The distinction between active smoking and nicotine replacement therapy use may be clinically important and cannot be made from cotinine levels alone without this history. If the test is being performed to confirm tobacco abstinence after a cessation attempt, inform your healthcare provider of the precise date and time of the last tobacco or nicotine product use, as cotinine remains detectable for two to four days after cessation and a positive result shortly after quitting does not necessarily indicate ongoing active use. Staying well hydrated before the blood draw facilitates easier venous access and a smooth collection experience.

If you are booking through the SecondMedic platform the Cotinine test price starts at approximately Rs. 341. The exact price will be confirmed at the time of booking through SecondMedic. If your doctor has prescribed multiple tests alongside Cotinine, SecondMedic health packages include Cotinine as part of a broader pre-surgical health screening or tobacco cessation monitoring panel at a significantly lower combined price.

SecondMedic offers convenient home sample collection for the Cotinine test across India, making it easy to get tested without visiting a diagnostic centre. Home collection is available free of charge for orders above Rs. 300. A trained phlebotomist will visit your preferred address between 7 AM and 10 PM, seven days a week, including Sundays and public holidays. Your blood sample is processed at NABL-accredited partner laboratories, and your report is delivered within 24 hours directly to your WhatsApp and email.