Which thermometer is more accurate for measuring body temperature? Three body temperatures give three results?

Thermometer is a "non-absolute standard" civil measuring instrument. Because it is not an absolute standard, there will be errors, even if the same two thermometers measure at the same point, there will be errors, but this error is very small and can be ignored.

At present, the common thermometers are mercury thermometer, electronic thermometer and infrared thermometer. Electronic thermometer and infrared thermometer are easily influenced by the difference of environmental temperature and the temperature of human body surface, and there will be deviations. This deviation is very small and does not affect the measurement results. Electronic thermometer and infrared thermometer have been used for a long time, so they should be calibrated to keep the values as accurate as possible.

The measuring position of mercury thermometer is in the armpit, mouth and anus of human body, so it is basically unaffected by the external environment. Mercury thermometers are very convenient for home use, unlike electronic thermometers and infrared thermometers, which will not delay the time when the battery is dead. Mercury thermometers should be used carefully at home to avoid breakage, and the mercury vapor after breakage is still very harmful to people. Accidentally, the mercury thermometer is broken. Collect the mercury as soon as possible and put it in a small bottle to seal it.

It can be seen that there is no need to entangle the deviation of thermometer. If the deviation between two thermometers measuring the same person is too large, at least one thermometer needs to be calibrated.

First, the thermometer is accurate. I think oral sublingual is the most accurate.

Ear thermometer is recommended for home use, especially suitable for infants, convenient and accurate.

The existing thermometer types include mercury thermometer, electronic thermometer and infrared thermometer. Of course, mercury thermometers are more accurate. Let's talk about the differences between several thermometers first.

Mercury thermometer: the measurement result is more accurate. Made of glass, with mercury in it, the price is generally around every 5 yuan, which is very low and usually placed under the armpit.

Disadvantages: adults use it well, but it is not convenient for babies and children with low cooperation.

Electronic thermometers mostly use the physical parameters of a substance, and now there are forehead temperature guns, ear temperature guns and so on. When in use, the electronic thermometer is turned on, and then the thermometer is placed on the tested part, such as forehead, inner wrist, ear canal, etc. I took it out when I heard the dripping sound again. At this time, the temperature displayed on the thermometer is our body temperature.

Electronic thermometer is easy to use, but the measurement results often have errors, so it is necessary to choose the products correctly.

Infrared thermometer, which has a short measuring time, has two types: contact type and non-contact type, and is generally used in public places.

Body temperature is a relatively constant vital sign. Under normal circumstances, the thermoregulation center keeps the body temperature between 36℃ and 37℃ through heat dissipation and heat generation, thus keeping the body temperature in balance with the external environment temperature. Abnormal body temperature reflects the failure of human body to dissipate heat and produce heat, which can reflect the severity of the disease to some extent.

The accuracy of measuring body temperature is related to the measuring position and the sensitivity of the measuring instrument. At present, the commonly used thermometers include electronic forehead thermometer, mercury thermometer, infrared scanner, etc. Among them, mercury thermometer has low sensitivity and is often measured under the armpit or in the mouth, so it is generally not disturbed by the external environment temperature, and the measured value is more accurate, which can be used as the basis for clinical diagnosis.

Although electronic forehead thermometer and infrared scanner are quick and sanitary, most of them measure the body temperature of naked parts of human body, and the measured values are easily disturbed by the measuring distance, body surface temperature and external environment temperature, and the accuracy of the measured numbers is not as good as that of mercury thermometer. Therefore, it is often used for screening multi-person temperature measurement.

Generally speaking, the measurement accuracy of thermometer is higher than that of mercury thermometer. In the process of use, it is necessary to standardize the operation, choose armpit, mouth or anus for temperature measurement, and pay attention to disinfection and breakage. When measuring with electronic thermometer, try to avoid the interference of the external environment of the room such as wind, high temperature and cold. When the reading difference is large, you can measure it twice more or try to choose the unexposed part (inside the forearm or inside the neckline) to improve the accuracy of the measured value.

Thanks for reading!

There are three kinds of thermometers for measuring body temperature: mercury thermometer, electronic thermometer and forehead thermometer.

1, mercury thermometer

Mercury thermometer is the most common and the measured value is the most accurate.

2. Electronic thermometer

Electronic thermometer is relatively safe and can be used to measure the temperature of baby's mouth, armpit and anus.

3, forehead temperature gun

The forehead temperature measuring gun is easy to operate, and the body temperature can be measured in one second without touching the skin. Suitable for newborns, the measurement site is limited to the forehead.

At present, there are all kinds of electronic thermometers on the market, and mercury thermometers are criticized for the risk of mercury leakage. Indeed, although the thermometer is broken and mercury is spilled, as long as it is recycled into the bottle with a wet cotton swab in time, water is poured into it to seal it and ventilated for a day, there is no need to worry. But if you don't know that the thermometer is broken, the chronic absorption that has been left in the next drawer is terrible. Therefore, to avoid the fear of mercury leakage, we only need to replace it with an electronic thermometer. If you are still hesitant and don't know about electronic thermometers, drop the mercury thermometer and electronic thermometer pk now.

The accuracy of mercury thermometer depends on the scale value. At present, the scale can only reach 0. 1 degree, and then it can only be estimated. The accuracy of electronic thermometer is also 0. 1 degree, which is similar to that of mercury.

One advantage of mercury thermometer is that its accuracy is very stable, but the accuracy of general electronic thermometer is the highest in the range of 37-39, and it will be worse if it is higher or lower.

Human body temperature includes core body temperature and body surface body temperature. The increase of body temperature in medical pathology or pathophysiology refers to the core body temperature, which is simply the temperature of internal organs. At present, there is no noninvasive and rapid method to measure core body temperature, so we use body surface temperature instead of core body temperature! But in the final analysis, the surface temperature is still not completely equal to the core temperature!

The most commonly used positions for body surface temperature measurement are armpit, mouth and anus, so there are armpit temperature, mouth temperature and anus temperature, and the anus temperature is the closest to the viscera, so the anus temperature is also the most accurate; Axillary temperature is the most convenient, but it can't reflect the core body temperature! For common temperature rise, such as cold, appendicitis, urinary tract infection, pneumonia and so on, use axillary thermometer. However, there are also some diseases whose armpit thermometers are not very accurate. The most typical is the patient with high fever after heatstroke. The underarm thermometer cannot accurately reflect the core body temperature! Anal temperature is the first choice for severe heatstroke!

The above is the part of temperature measurement. Let's talk about thermometers. Mercury thermometer is the most traditional and stable thermometer at present! At present, well-known electronic thermometers, such as temperature guns, are used in our hospital only after the epidemic, because they are convenient, fast and hygienic, and can effectively avoid the possibility of cross-infection! However, during my work, "patients who don't have a fever" will come from time to time at the triage desk, but when I ask about my medical history, I will take my temperature with a mercury meter and have a fever, even 38. So I don't like to use electronic thermometers!

Finally, to popularize medical terms, I have been talking about rising body temperature, not fever! Strictly speaking, fever means that the temperature rise caused by the upward movement of the temperature set point is called fever; However, if the set point does not move upward, the temperature will rise. We call it overheating, such as heatstroke and scleroderma.

At present, there are three kinds of thermometers commonly used to measure body temperature: traditional mercury thermometer, electronic induction thermometer and infrared thermometer to collect body temperature. Influenced by the temperature measuring environment, electronic thermometer and infrared thermometer are convenient and quick, and are suitable for sorting and large-scale temperature measurement. Whether it is more accurate, of course, is that the traditional mercury thermometer is more accurate, accurate in temperature measurement and accurate in results. However, mercury thermometer is not suitable for large-scale temperature measurement because of its long temperature measurement time and high temperature requirements.