Final answer:
A 4. tympanic measurement using an infrared ear thermometer is the most accurate and hygienic method for an EKG tech to measure a patient's body temperature.
Step-by-step explanation:
The most accurate method for an EKG tech to measure a patient's body temperature, considering the options provided, is using a 4. tympanic measurement, which employs an infrared ear thermometer.
This device was developed by the Diatek Corporation with the support of NASA, and it uses infrared astronomy technology to measure the energy emitted by the eardrum.
The tympanic method is generally more accurate than oral or axillary methods because the ear's proximity to the brain's temperature-regulating center provides a core body temperature reading.
Furthermore, this approach minimizes the risk of cross-infection as it avoids contact with mucous membranes and allows for rapid temperature measurement, which is particularly useful for newborn, critically ill, or incapacitated patients.