General Principles for Thermometer Hygiene
To prevent the spread of germs and ensure accurate temperature readings, all thermometers should be cleaned and disinfected thoroughly before and after every use. No matter the type of thermometer, a few universal rules apply. First, always wash your hands with soap and water before handling the device. Second, use the proper cleaning agent, such as 70% isopropyl alcohol, which is effective at killing bacteria and viruses. Finally, ensure the thermometer is completely air-dried before storing it away. This multi-step process helps guarantee that the device is safe and ready for its next use.
For households with multiple family members, or when using a thermometer for different purposes, such as both oral and rectal readings, it is paramount to use separate, clearly labeled thermometers. This eliminates the risk of cross-contamination, a crucial practice, especially when caring for infants and young children.
Cleaning Different Types of Thermometers
Digital Thermometers
Digital thermometers are the most common type for household use and can be used orally, rectally, or under the arm. Follow these steps to clean and disinfect yours properly:
- Wash your hands thoroughly.
- Wipe the probe (the tip used for the reading) with an alcohol swab or a cotton ball soaked in 70% isopropyl alcohol.
- For oral or underarm use, you may rinse the probe under cool, running water after disinfecting to remove any alcohol residue. Never submerge the entire thermometer, as this can damage the electronic components.
- Allow the probe to air-dry completely.
- For rectal thermometers, wash the probe thoroughly with antibacterial soapy water first to remove any debris, then disinfect with alcohol as described above. Again, do not submerge.
Temporal (Forehead) Thermometers
These non-invasive thermometers measure heat from the temporal artery on the forehead. Though they don't enter a body cavity, they can still transfer germs if they make skin contact or are passed between people.
- For non-contact models: If the device does not touch the skin, simply wipe the sensor and the body with a soft cloth dampened with 70% isopropyl alcohol.
- For contact models: If the thermometer touches the skin, wipe the sensor and the entire device with an alcohol swab before and after each use.
- Allow the device to air-dry completely before storing.
Tympanic (Ear) Thermometers
Ear thermometers use an infrared sensor to measure the temperature inside the ear canal. Many models come with disposable probe covers, but the device itself still requires cleaning.
- If your model uses probe covers, discard the cover after each use.
- Clean the infrared sensor at the tip with a cotton swab lightly dampened with 70% isopropyl alcohol. It is critical to be gentle and not scratch the lens, as this could affect accuracy.
- Wipe the body of the thermometer with a soft cloth dampened with alcohol.
- Let the thermometer air-dry completely before putting on a new probe cover or storing.
Comparison of Cleaning Methods
| Thermometer Type | Cleaning Agent | Submerge? | Important Notes |
|---|---|---|---|
| Digital (Oral/Armpit) | 70% Isopropyl Alcohol Swab / Antibacterial Soapy Water | No | Wipe probe; avoid electronics. |
| Digital (Rectal) | Antibacterial Soapy Water then 70% Isopropyl Alcohol Swab | No | Wash twice for rectal use. |
| Temporal (Forehead) | 70% Isopropyl Alcohol Swab | No | Wipe sensor and body; avoid harsh cleaners. |
| Tympanic (Ear) | 70% Isopropyl Alcohol Dampened Cotton Swab | No | Clean sensor gently; replace probe covers. |
What to Avoid When Cleaning a Thermometer
To protect your thermometer and ensure its longevity and accuracy, be mindful of what you should not do:
- Do not use hot water. High temperatures can damage the sensitive heat sensors in digital and ear thermometers.
- Do not place in a dishwasher. The intense heat and water pressure will destroy electronic devices.
- Do not use harsh cleaning chemicals, such as acetone or strong chemical disinfectants, unless specifically instructed by the manufacturer. These can degrade the plastic and damage components.
- Do not use a shared or used cloth to dry. This can re-contaminate the thermometer. Always use a clean paper towel or let it air-dry.
- Do not re-use single-use probe covers. Always use a fresh one for each new temperature reading.
Proper Storage for a Clean Thermometer
Once your thermometer is fully clean and dry, proper storage is the final step to maintaining hygiene. Store the thermometer in its original protective case to shield it from dust, debris, and potential damage. If the original case is lost, use a clean, dedicated plastic bag or container. Keep it in a location that is clean, dry, and away from extreme temperatures, such as a medicine cabinet or drawer.
Conclusion: Prioritizing Health Through Proper Cleaning
Maintaining proper thermometer hygiene is a simple yet powerful way to protect your health and the health of those around you. By following the correct cleaning and disinfection procedures for your specific type of thermometer, you can confidently use this essential health tool. For further guidance on fever symptoms and proper temperature taking techniques, authoritative sources like the CDC offer excellent resources. A clean thermometer is a cornerstone of a healthy home.
