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Ions

Cations; Anions

An ion is an atom or group of atoms that has an electric charge. Ions with a positive charge are called cations. Ions with a negative charge are called anions.

Many normal substances exist in the body as ions. Common examples include sodium, potassium, calcium, chloride, and bicarbonate. These substances are known as electrolytes.

Ions can be created using radiation such as x-rays. Ionizing radiation is often used to diagnose or treat a medical condition.

Related Information

MIBG scintiscan
Bone scan
Gallbladder radionuclide scan
Gallium scan
PET scan
Liver scan
Lung gallium scan
Nuclear ventriculography
Pulmonary ventilation/perfusion scan
Radioactive iodine uptake
Radionuclide cystogram
Renal venogram
Radionuclide cisternogram
Thyroid scan

References

Kapoor G, Toms AP. Current status of imaging of the musculoskeletal system. In: Adam A, Dixon AK, Gillard JH, Schaefer-Prokop CM, eds. Grainger & Allison's Diagnostic Radiology. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 38.

Smith SG, Schreiber MA. Shock, electrolytes, and fluid. In: Townsend CM Jr, Beauchamp RD, Evers BM, Mattox KL, eds. Sabiston Textbook of Surgery. 21st ed. Philadelphia, PA: Elsevier; 2022:chap 4.

Taber's Cyclopedic Medical Dictionary. 24th ed. F.A. Davis Company; 2021. www.tabers.com/tabersonline. Accessed April 7, 2022.

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Review Date: 11/4/2021  

Reviewed By: Linda J. Vorvick, MD, Clinical Associate Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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