تفاوت دماسنج پزشکی و دماسنج معمولی؛ علت خمیدگی در مسیر مایع درون دماسنج پزشکی

۱. تفاوت در گستره دما، دماسنج پزشکی از ۳۵ تا ۴۲ ولی دماسنج معمولی بیشتر است.
۲. تفاوت در دقت اندازه گیری. دقت دماسنج پزشکی ۰.۱ درجه ولی دماسنج معمولی ۱ درجه است.
حتماً بخوانید:
دنیای زنده؛ آزمونهای آنلاین دنیای زنده
گوارش و جذب مواد؛ آزمونهای آنلاین گوارش و جذب
۳. تفاوت در شکل: دماسنج پزشکی در نزدیک مخزن آن خمیدگی است ولی دماسنج معمولی خمیدگی ندارد.
۴. تفاوت در جنس: شیشه دماسنج پزشکی ذره بینی است ولی دماسنج معمولی این چنین نیست.
۵. تفاوت در ابعاد: میله دماسنج پزشکی باریکتر از دماسنج معمولی است.
خمیدگی بالای مخزن جیوه سبب می شود که هنگام اندازه گیری دمای بدن بیمار جیوه مایع به مخزن بر نگردد و پزشک فرصت کافی برای خواندن دمای دقیق را داشته باشد. البته قبل از هر بار استفاده دماسنج را به شدت تکان میدهند تا جیوه به مخزن باز گردد.
دماسنج طبی
دماسنج طبی برای سنجش دمای بدن بیماران به کار میرود. معمولاً این دماسنج دارای مخزن جیوه و استوانه شیشهای مدرج است که از ۳۵ تا ۴۲ درجه بندی شدهاست (در مقیاس سلسیوس). دماسنج در زیر زبان، زیر بغل یا مقعد قرار میگیرد. البته سنجش دمای بیمار از پیشانی یا پرده صماخ نیز قابل انجام است. امروزه از دماسنجهای دیجیتال نیز استفاده میشود.
دمای رکتوم نزدیکترین دما به دمای مرکزی بدن است.
انواع دماسنج و ترمومتر پزشکی
دماسنج جیوهای:
دماسنج دیجیتالی:
دماسنج گوشی یا تمپانیک:
نوعی ترمومتر دیجیتالی است که نوک آن داخل گوش قرار داده شده و در عرض چند ثانیه صدای بیب پایان کار را اعلام و درجه حرارت صفحه نمایش خوانده می شود. این دماسنج برای شیرخواران بخصوص کوچکتر از ۳ ماه به دلیل کوچک بودن مجرای گوش دقیق نیست.
دماسنج غیر لمسی (مادون قرمز) پیشانی:
این ترمومتر هم دیجیتالی است. نوک آن را در فاصله ۳-۱ سانتی متری وسط پیشانی نگه داشته و در عرض چند ثانیه، صدای بیب پایان کار را اعلام و درجه حرارت صفحه نمایش خوانده می شود.
تب اثرات مثبتی نیز دارد، هم زنگ خطری برای عفونت یا التهاب موجود در بدن بوده و هم در تحریک سیستم ایمنی و جلوگیری از رشد و تکثیر برخی باکتریها موثر است. از طرفی، هرچند، اثرات متابولیکی ناشی از تب در کودکان تا حدی قابل تحمل است؛ اما اگر از حدی بیشتر شود مشکلاتی مثل بی قراری و کم آبی در کودک را به دنبال خواهد داشت.
امتیاز کاربران
Advantages and Disadvantages of Different Types of Thermometers

Having a reliable medical thermometer at home can be incredibly helpful. The ability to accurately find out if someone has a fever gives you much-needed information about important next steps for their care.
There are many types of contact and contact-free thermometers to choose from. The ages of your household members, as well as personal preference, can help you determine which types to buy.
Like any other device in your home, it’s important to understand how your thermometer works. Not every type works the same way or is designed to provide the same temperature readings.
Guesswork is the last thing you want to rely on when someone is sick. Here’s an overview of medical thermometers, how to use them, and what their measurements mean.
No matter which type you choose, read the manufacturer’s instructions carefully. No thermometer will provide accurate results if it’s used incorrectly.
Never use a thermometer on a person that is meant for another purpose, such as a laboratory or meat thermometer. These won’t provide accurate readings.
If you’re a parent, you may be wondering why we’re omitting forehead strip thermometers from this roundup. Strip thermometers are inexpensive and quick to use. However, since they measure skin temperature rather than body temperature, they’re significantly less accurate and should be avoided.
Digital thermometer

Digital thermometers work by using heat sensors that determine body temperature.
They can be used to take temperature readings in the mouth, rectum, or armpit.
When assessing digital thermometer readings, keep in mind that armpit (axillary) temperature runs about ½ to 1°F (0.6°C) cooler than oral readings. Rectal thermometers run ½ to 1°F (0.6°C) warmer than oral readings.
Benefits
Digital thermometers provide accurate readings in about 1 minute or less.
Drawbacks
In order to get an accurate reading from oral use, the tip of the device must be placed under the tongue with the mouth completely closed. For this reason, rectal readings are considered to be the most accurate for infants and small children. Additionally:
- Oral readings won’t be accurate if they are taken too close to eating or drinking, because results may be skewed by your food or drink’s temperature. Wait at least 15 minutes.
- Rectal readings may be uncomfortable to get for infants and small children.
- You shouldn’t use the same thermometer for both rectal and oral readings. This may require the purchase of two thermometers, which should be labeled.
- Batteries in thermometers should be replaced periodically. Make sure you have the right type of batteries on hand for your device and that you understand how to change them, so you’re not left scrambling in an emergency.
Oral thermometer

Oral temperature can be taken by either a digital or mercury thermometer. We’ll go over the benefits and drawbacks of mercury thermometers below.
The average oral temperature reading is 98.6°F (37°C). However, any oral temperature from 97°F (36.1°C) to 99°F (37.2°C) is considered typical. Some people run naturally cool, and others slightly warmer. It’s a good idea to know what your temperature typically is so you can assess whether you’re running a fever when you feel sick.
Benefits
Oral thermometers are most accurate in children over 3 and in adults.
Drawbacks
Small children and people with breathing issues may not be able to keep their mouths closed long enough to acquire an accurate reading.
Digital ear (tympanic) thermometer

Tympanic thermometers measure the temperature inside the ear canal through infrared ray technology.
Tympanic readings are 0.5°F (0.3°C) to 1°F (0.6°C) higher than oral temperature readings.
Benefits
Tympanic thermometers provide fast and accurate readings and may be preferable to oral or rectal thermometers, especially in children.
Drawbacks
- Due to the size of the ear canal, tympanic thermometers aren’t recommended for infants under 6 months old.
- They must be positioned properly in order to get accurate results.
- Obstructions like earwax may skew results.
- They may not fit properly in a small or curved ear canal.
Forehead (temporal) thermometer

Forehead thermometers use infrared sensors to measure the temperature of the superficial temporal artery, which is a branch of the carotid artery.
Some are known as non-contact infrared thermometers.
Forehead thermometers that require no physical contact have become very popular for use in venues such as airports, stores, and stadiums.
Forehead temperature readings run around 1°F (0.6°C) cooler than oral temperature readings.
Benefits
- Temporal thermometers provide quick readings, within several seconds.
- They are easily administered and can be used on infants, children, and adults.
- Some research indicates that temporal thermometers may be as accurate as rectal thermometers in children, and provide better readings than ear or armpit thermometers can. However, these findings aren’t conclusive and have been disputed in other studiesTrusted Source.
Drawbacks
- Forehead thermometers must be positioned accurately and according to the manufacturer’s instructions, or they will not provide the right reading.
- Readings can be affected by external factors, including drafts, wind, indoor heating, and direct sunlight.
- Wearing certain clothing, such as hats or heavy coats, can skew the results.
App-based thermometer

Most free phone apps designed to take temperature readings are meant for recording the temperature of environments, not people.
Phone apps that help with taking people’s temperatures rely on digital thermometers that link back to the app via Bluetooth connection.
Benefits
- Temperatures can be taken orally, rectally, or under the arm.
- They provide readings within 8 to 10 seconds.
- Some apps let you upload your anonymous temperature readings to a health and weather map, which can help make local authorities aware of illness spikes in your geographic area.
- Some apps provide suggestions for medical next steps, based on the reading.
- Most apps provide you with the ability to keep a log of multiple people’s temperatures.
Drawbacks
- Not every app or thermometer that connects to an app is reliable. Some manufacturers have better track records than others.
- App-based thermometers may be significantly more expensive than digital thermometers without Bluetooth connectivity.
Pacifier thermometer

If your baby uses a pacifier, this may be an easy way for you to record their approximate temperature.
Benefits
Ease of use is the biggest benefit of pacifier thermometers.
Drawbacks
Pacifier thermometers must remain in the mouth, without moving, for up to 6 minutes. Additionally, they provide an approximation of temperature rather than an exact reading.
Mercury (liquid in glass) thermometer

Mercury thermometers were once the only option available for taking temperature.
Due to safety concerns, they’re no longer widely available and may even be illegal where you live.
Benefits
- Mercury thermometers provide accurate temperature readings and can be used orally, rectally, or under the arm.
- They don’t require batteries.
Drawbacks
- Since they’re made from glass, mercury thermometers may break easily, allowing toxic mercury to escape.
- They may also cause cuts or glass splinters if they break.
- Since they contain a hazardous substance, mercury thermometers must be disposed of properly and can’t be thrown into the trash.
- They can be hard to read and must stay in place for 3 minutes.
The best thermometer is the one that you can use most comfortably and correctly. It’s also helpful if your thermometer comes from a reliable manufacturer.
Rectal thermometers are still considered by many medical professionals to be the gold standard for babies and children. However, oral and forehead readings are also typically very reliable in these age groups.
Always keep in mind that temperature readings vary, based on how the thermometer is administered:
- Rectal thermometer readings will be around 0.5°F (0.3°C) to 1°F (0.6°C) higher than oral temperature readings.
- Tympanic thermometer readings are typically 0.5°F (0.3°C) to 1°F (0.6°C) higher than oral temperature readings.
- Axillary thermometer readings can be 0.5°F (0.3°C) to 1°F (0.6°C) lower than oral temperature readings (and may be the least reliable).
- Temporal thermometer readings are often 0.5°F (0.3°C) to 1°F (0.6°C) lower than oral temperature readings.
بسیارعالی
خیلی مفیدوارزنده بود
واسه ظاهرسازی چیز خوبیه… هه
خسته نباشید
بهترین بود
عالی بود
تفاوت های جالبی بود
مثل همیشه عالی و کاربردی
اموزنده و مفید👌
بسیار اموزنده 👍👍👍
مطلبی بسیار عالی و آموزنده بود دست شما درد نکنه🙏
اطلاعات مفید وکاربردی داشت این مقاله خیلی ممنون⚘🌹⚘🌹
مطلب جالبی بود استاد
واقعا جالب بود
عالی بود استفاده کردیم
مثل همیشه عالی
اطلاعات کامل و جامعی بود👌
عالی بود
بله درسته قاعدتا باید دقت اندازه گیری در دماسنج پزشکی بیشتر از دماسنج معمولی باشد.
عالی بود
مقاله بسیار کاملی بود و اطلاعات زیادی درباره دماسنج ها کسب کردم
عالی بود 👌
چه جالب من همیشه فکر میکردم دماسنج های طبی فقط برای زیر زبونه و علت اینکه چرا تکونشون میدن رو نمیدونستم مطالب عالی و گیرا👌