Medical Ranges & Levels

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For college-age individuals, reaction times to light stimuli have been published as 190 milliseconds, or 0.19 seconds, and to auditory stimuli as 160 milliseconds, or 0.16 seconds. Human reaction times vary according to the type of stimuli, the method of measurement and the particular study's results.

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  • What are normal thyroid levels?

    Q: What are normal thyroid levels?

    A: The normal range of the thyroid hormone triiodothyronine goes from 100 to 200 nanograms per deciliter of blood, and the normal range for thyroxine is from 4.5 to 11.2 micrograms per deciliter, according to MedlinePlus. Abnormal amounts of these hormones may indicate an overactive or underactive thyroid.
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  • What is the deepest stage of sleep?

    Q: What is the deepest stage of sleep?

    A: Stage four of non-REM sleep is the deepest stage of sleep, according to Psych Central. Stage four is also called delta sleep because of the deep, slow delta waves of the brain during this part of the sleep cycle, which lasts about 30 minutes.
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  • What is high blood sugar?

    Q: What is high blood sugar?

    A: High blood sugar, or hyperglycemia, is identified by blood glucose levels that are greater than 200 milligrams per deciliter, according to Mayo Clinic. Common signs of high blood sugar include increased urination, blurred vision, increased thirst, fatigue and headache. In extreme cases, high blood sugar can cause coma and death.
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  • How much saliva do people swallow per day?

    Q: How much saliva do people swallow per day?

    A: According to WebMD, the human body makes around 2 to 4 pints of saliva a day. A person also swallows that amount of saliva per day.
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  • Why is respiration important?

    Q: Why is respiration important?

    A: Respiration is important because it produces energy that is essential for the normal functioning of the body. Respiration provides cells with oxygen and expels toxic carbon dioxide. The BBC notes that cells need energy for movement, multiplication, the synthesis of essential molecules and maintaining body temperature.
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  • When is your body temperature too high?

    Q: When is your body temperature too high?

    A: Any body temperature above 102.5 degrees Fahrenheit is considered a high fever, says MedicaLook. Fevers that reach 107 F or higher are exceptionally dangerous, because the majority of humans cannot survive such high internal temperatures. The Mayo Clinic advises that adults should seek immediate medical attention for fevers of 103 F or higher.
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  • What happens if you do not get enough vitamin D?

    Q: What happens if you do not get enough vitamin D?

    A: According to WebMD, vitamin D deficiency is traditionally known to cause rickets, but a myriad of other health conditions have also been associated with low levels of vitamin D in the blood, including bone and muscle pain and weakness, cardiovascular disease, asthma and cancer. Vitamin D, commonly referred to as the sunshine vitamin, helps the body use calcium and is essential for strong bones and immunity.
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  • How do you increase platelet count?

    Q: How do you increase platelet count?

    A: To increase their platelet count, individuals need to treat the underlying cause of thrombocytopenia, according to WebMD. For example, if thrombocytopenia arises because of an infection, treating it can raise the platelet count.
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  • What is the normal pulse rate of an adult?

    Q: What is the normal pulse rate of an adult?

    A: The normal pulse rate of an adult ranges from 60 to 100 beats per minute, according to Medical News Today. This rate temporarily increases or decreases depending on a variety of factors, including physical activity, body temperature and emotional state.
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  • What should your blood pressure be?

    Q: What should your blood pressure be?

    A: According to WebMD, a normal blood pressure is lower than 120/80. This means that the systolic number is 120 or lower, and the diastolic number is 80 or lower. The systolic number measures artery pressure when the heart contracts. The diastolic number measures artery pressure between heartbeats.
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  • How do hormones affect behavior?

    Q: How do hormones affect behavior?

    A: According to Sciences 360, hormones affect many facets of human behavior, including emotions, health, sexual attraction and even weight. Sciences 360 defines hormones as chemicals created by a cell or organ that communicate to another cell or organ to help to regulate normal body functions such as sleeping and eating.
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  • When does the human body stop growing?

    Q: When does the human body stop growing?

    A: According to Curiosity.com, the human body grows steadily from birth to late teens, at which point the skeletal system has fully formed. However, a few studies have found that both the pelvis and skull continue to grow after the teen years.
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  • How many decibels can the human ear take?

    Q: How many decibels can the human ear take?

    A: If a sound level of 85 decibels is endured for eight hours, permanent damage can result. At 100 decibels, permanent damage can result after as little as 15 minutes. Above 120 decibels, the damage can be both permanent and immediate.
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  • When do men stop growing taller?

    Q: When do men stop growing taller?

    A: Most men stop growing taller at about age 16, according to KidsHealth.org. Even if they do not grow taller after that age, their muscles usually continue to develop.
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  • How do you read a blood test?

    Q: How do you read a blood test?

    A: The National Heart, Lung, and Blood Institute shows normal ranges for the most common values detected on a blood test, including red blood cell count, white blood cells, platelets, hemoglobin, hematocrit and mean corpuscular volume. The NHLBI also gives normal ranges for blood glucose levels and lipoproteins such as cholesterol. Abnormal results can indicate disease as well as issues with diet, menstrual cycle, physical activity levels, alcohol intake and medicines.
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  • What are characteristics of a healthy person?

    Q: What are characteristics of a healthy person?

    A: The characteristics of a healthy person include a high level of high-density lipoprotein cholesterol, a low resting heart rate, balanced muscular strength, a high level of cardiovascular fitness and being happy in work and home life. Together, these factors lower the risk of heart attack, cancer, injury, mental illness and other diseases that are more likely to manifest themselves in less healthy individuals.
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  • What is a normal heart rate?

    Q: What is a normal heart rate?

    A: Normal resting heart rate for adults is between 60 and 100 beats per minute, according to the Mayo Clinic. Resting heart rate varies considerably by age, but after 16, teenagers have the same normal range as adults.
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  • What are normal progesterone levels?

    Q: What are normal progesterone levels?

    A: In women, normal progesterone levels from the first to the 14th day of the menstrual cycle are less than 1 nanogram per milliliter, according to WebMD. From the 15 until the 28th day of the menstrual cycle, normal progesterone levels are around 2 to 25 nanograms per milliliter. In men, normal values are less than 1 nanogram per milliliter.
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  • What are acceptable radon levels?

    Q: What are acceptable radon levels?

    A: According to the Environmental Protection Agency, radon levels above 4 pCi/L (picocuries per liter) are dangerous. People who live in homes where the average radon level is more than 4 pCi/L should alter their home to reduce the radon level.
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  • When should I see a doctor about high blood pressure?

    Q: When should I see a doctor about high blood pressure?

    A: One should see the doctor if her blood pressure measures above 140/90 over the course of two measurements, states WebMD. It is also important to schedule an appointment if one begins experiencing side effects from blood pressure medicine or if normally controlled blood pressure goes above normal range.
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  • What is the highest fever ever recorded?

    Q: What is the highest fever ever recorded?

    A: The highest fever ever recorded was 115.7 degrees Fahrenheit. This fever was reported in the Lawrence Journal-World, in July of 1980. A 51-year-old man named Willie Jones suffered heat stroke on July 10, 1980, when the temperature outside was 90 degrees Fahrenheit. He received treatment and survived the fever.
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