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pH in the Human Body

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Dr. Surat P, Ph.D.

By Dr. Surat P, Ph.D.

The pH of the human body lies in a tight range between 7.35-7.45, and any minor alterations from this range can have severe implications.

The pH scale Universal Indicator pH Color Chart diagram acidic alkaline values common substances. Image Credit: Trgrowth / Shutterstock

The pH scale Universal Indicator pH Color Chart diagram acidic alkaline values common substances. Image Credit: Trgrowth / Shutterstock

pH of Different Body Fluids

Although the pH of blood ranges from 7.35-7.45, the pH of other body fluids is different. pH indicates the level of H+ ions, where low pH indicates too many H+ ions and high pH indicates too many OH- ions. If the pH levels drop below 6.9, it can lead to coma. However, different body fluids have different pH values. The pH of saliva is ranges from 6.5 to 7.5. After swallowing, the food reaches the stomach where upper and lower parts of stomach have different pH values. The upper part has a pH of 4−6.5, while the lower part is highly acidic with a pH of 1.5−4.0. It then enters the intestine which is slightly alkaline, with a pH of 7−8.5. Maintaining the pH values of different regions is critical for their function.