How to Read a Thermometer
Apr 14, 2022
Source: Cainiu Health
Dr. Guo Xiheng
Introduction
Read the thermometer at the triangular prism section between the scale markings and numbers—the prism acts as a magnifier. Hold the top end of the thermometer with two fingers and gently shake it until you see the mercury column descend. Before use, shake the mercury column down to below 35°C. Place the mercury bulb of the thermometer deep into the axilla (armpit), and hold it securely in place by pressing the upper arm against the body to prevent dislodgement or falling. Measure for 5–10 minutes, then remove the thermometer.
Some individuals have relatively low immune function, and thus may develop fever during seasonal transitions. It is therefore essential to monitor body temperature promptly. But how should one read a thermometer?
How to Read a Thermometer
To read a mercury-in-glass thermometer, observe the triangular prism-shaped section between the scale markings and numerals—this prism magnifies the mercury column for easier reading. Hold the upper end of the thermometer with two fingers and gently shake it downward until the mercury column falls below 35°C. Then place the mercury bulb under the armpit, ensuring it is fully inserted into the axillary cavity. Secure it in place by pressing the upper arm against the chest to prevent dislodgement or falling. Measure for five to ten minutes, then carefully remove the thermometer. Due to thermal inertia, wait until the mercury column stabilizes before taking the reading.
Reading a thermometer is generally straightforward. For electronic thermometers, simply press the power button—the temperature will appear on the display screen, ready for immediate reading. Mercury poisoning may occur if a mercury thermometer breaks and mercury vapor is inhaled. However, prompt cleanup of spilled mercury and adequate room ventilation typically prevent poisoning, as the amount of mercury in a clinical thermometer is extremely small. Toxicity may occur only when airborne mercury vapor concentrations reach 1.2–8.5 mg/m³. Symptoms of acute mercury poisoning may include dizziness, nausea, and vomiting.
Patients with severe mercury poisoning may experience sudden weakness—particularly profound fatigue and drowsiness. Mercury toxicity can also affect heart rate; many patients report palpitations, chest tightness, and shortness of breath. We hope this information proves helpful to you.
