February 16, 2026 | By Greene Broillet & Wheeler
Carbon monoxide exposure often causes headaches, dizziness, weakness, nausea, vomiting, chest pain, and confusion. These can worsen and lead to catastrophic injuries or even death. Understanding how to test for carbon monoxide poisoning is essential if there is a possibility of exposure to this toxic gas. Greene Broillet & Wheeler helps injured individuals and families evaluate medical records, testing results, and environmental evidence to determine whether carbon monoxide exposure contributed to serious injury or loss of life.
Medical testing often becomes necessary when symptoms alone cannot explain a sudden illness or injury. In personal injury cases involving exposure to toxic gas, understanding how to test for carbon monoxide poisoning helps document how carbon monoxide affected the body and whether or not there is a causal connection between exposure and injury.
Timing carries particular importance in such cases because carbon monoxide dissipates from the bloodstream relatively quickly. Emergency room records and physician observations help establish when symptoms first appeared and how rapidly they escalated, which informs exposure analysis, and diagnostic findings may also support claims involving neurological symptoms. These findings help corroborate other evidence by showing physical effects consistent with oxygen deprivation.
Medical records remain central in personal injury cases. Hospital charts and diagnostic documentation create a chronological record linking reported symptoms with clinical findings. These can help our legal team evaluate injury severity and ongoing care needs.
Carbon monoxide poisoning can be identified through a blood test. If a person has been exposed to high levels of the gas, their bloodstream will contain elevated levels of carboxyhemoglobin (COHb). This compound forms when carbon monoxide binds with hemoglobin in the blood. A doctor can use this information to determine if an individual has been poisoned by carbon monoxide and how much of it was present in their body at the time of the test. However, the half-life of carboxyhemoglobin is relatively short. Unless blood tests are performed promptly after exposure, the results may not be useful.
Another way to prove carbon monoxide poisoning is through imaging scans, such as MRIs, CTs, or other scans. Certain parts of the body are particularly susceptible to damage from carbon monoxide, and these areas may show evidence of tissue damage if someone has been poisoned. Such scans can help verify that carbon monoxide was the cause of death or illness for someone affected.
Available 24/7
Environmental testing often helps identify where carbon monoxide exposure occurred inside residential or commercial properties. Experts can perform air quality assessments near furnaces, water heaters, stoves, fireplaces, and appliances that generate combustion byproducts. These evaluations measure carbon monoxide levels in the air and pinpoint areas where dangerous concentrations accumulate.
Inspectors also review ventilation systems, exhaust pathways, and appliance installation. Restricted airflow, blocked vents, or defective equipment may allow carbon monoxide to build up indoors. In apartment complexes or shared buildings, testing may reveal carbon monoxide movement between units through shared ductwork or structural openings.
Public health authorities warn that carbon monoxide exposure often goes unnoticed until symptoms develop or testing confirms dangerous conditions. According to the U.S. Environmental Protection Agency, higher concentrations can cause severe headaches, dizziness, nausea, confusion, fainting, and death, while lower exposure levels may still produce lingering health effects that complicate diagnosis and injury evaluation. Because sensory detection offers no warning, environmental measurements provide critical evidence. When paired with medical findings, air quality reports help establish causation in personal injury claims involving unsafe property conditions or negligent maintenance.
Carbon monoxide detectors may play a key role in documenting exposure. Many modern devices record alarm activation and concentration levels, which creates a time-stamped record showing when unsafe conditions developed. These alarms frequently prompt emergency response, medical evaluation, and follow-up investigation, linking detector data directly to treatment records and incident reports.
California law reflects the importance of this documentation. Under California Health and Safety Code section 13261, carbon monoxide detection devices provide vital, effective, and low-cost protection and should appear in every residential dwelling in Los Angeles and throughout the state. When inspections identify missing, nonfunctional, or improperly installed detectors, those findings may point to safety failures relevant in personal injury claims involving toxic exposure.
Detector data rarely stands alone. Fire department reports, housing authority inspections, and private safety evaluations often build on alarm records by identifying appliance defects, building code violations, or ignored safety warnings. When detector records align with inspection findings, the combined evidence strengthens claims involving preventable carbon monoxide exposure and unsafe property conditions in Los Angeles and beyond.
Finally, it may be possible to prove carbon monoxide poisoning through a post-mortem examination. In some cases, an autopsy may reveal evidence of carbon monoxide poisoning in the person’s body, such as in their organs or tissues.
Evidence used to prove carbon monoxide poisoning often comes from multiple sources. Personal injury claims usually require multiple documents or pieces of evidence. A personal injury attorney typically reviews medical records, testing data, and inspection findings together to evaluate whether exposure occurred and whether it caused harm, including:
Personal injury cases involving toxic exposure rely on evidence evaluated as a whole rather than in isolation. Medical records, environmental testing, and inspection documentation work together to show how exposure occurred and how it caused injury. Collecting and analyzing this evidence can be used to support liability claims under California personal injury law.
There are several ways to determine if someone has suffered carbon monoxide poisoning. If you or a loved one has been affected by carbon monoxide exposure in Los Angeles, contact an experienced attorney from Greene Broillet & Wheeler to discuss your case.
Call our Los Angeles attorneys at (866) 634-4525 or contact us online to get in touch with someone from our team about the details of your case right away. We will fight to recover full and fair compensation for you.
Browne Greene is a legendary California trial lawyer and senior partner whose career has set national standards for plaintiff advocacy. He has tried and won more million-dollar jury verdicts than any attorney in California history, including numerous seven- and eight-figure results across personal injury, product liability, medical malpractice, and wrongful death cases. Consistently recognized among The Best Lawyers in America since 1987, Browne is a former Trial Lawyer of the Year and a long-standing Super Lawyer, widely respected for his leadership, courtroom excellence, and lifelong service to the legal profession.
This page has been written, edited, and reviewed by a team of legal writers following our comprehensive editorial guidelines. This page was approved by Founding Partiner, Tim J. Wheeler who has more than 20 years of legal experience as a personal injury attorney.
call us at 866-634-4525