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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.
In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
![Cataract. When the pupil is dilated, an abnormal opacity or whiteness of the lens can be observed in](https://biology-forums.com/gallery/47/medium_14755_14_10_12_6_36_55_9393608.jpeg)
![Common skin signs are often evidence of an illness or disorder. A macule is a discolored spot on the ...](https://biology-forums.com/gallery/47/medium_665046_01_03_17_6_26_23_26130687.jpeg)