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Medical Author:

Charles Patrick Davis, MD, PhD

Charles Patrick Davis, MD, PhD

Dr. Charles "Pat" Davis, MD, PhD, is a board certified Emergency Medicine doctor who currently practices as a consultant and staff member for hospitals. He has a PhD in Microbiology (UT at Austin), and the MD (Univ. Texas Medical Branch, Galveston). He is a Clinical Professor (retired) in the Division of Emergency Medicine, UT Health Science Center at San Antonio, and has been the Chief of Emergency Medicine at UT Medical Branch and at UTHSCSA with over 250 publications.

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Medical Editor:

Melissa Conrad Stöppler, MD, Chief Medical Editor

Melissa Conrad Stöppler, MD, Chief Medical Editor

Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.

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Normal hemoglobin values are related to the person's age and sex. Normal values may vary slightly between test systems, and which groups of doctors have determined "normal values" for their group of patients; however, the value ranges are close (vary by about 0.5 g/dl) for almost every group. An example of normal ranges that is widely accepted by Family Practice physicians is as follows:

• Birth: 13.5 to 24.0 g/dl (mean 16.5 g/dl)
• Age <1 month: 10.0 to 20.0 g/dl (mean 13.9 g/dl)
• Age 1-2 months: 10.0 to 18.0 g/dl (mean 11.2 g/dl)
• Age 2-6 months: 9.5 to 14.0 g/dl (mean 12.6 g/dl)
• Age 0.5 to 2 years: 10.5 to 13.5 g/dl (mean 12.0 g/dl)
• Age 2 to 6 years: 11.5 to 13.5 g/dl (mean 12.5 g/dl)
• Age 6-12 years: 11.5 to 15.5 g/dl (mean 13.5)
• Female
  • Age 12-18 years: 12.0 to 16.0 g/dl (mean 14.0 g/dl)
  • Age >18 years: 12.1 to 15.1 g/dl (mean 14.0 g/dl)
• Male
  • Age 12-18 years: 13.0 to 16.0 g/dl (mean 14.5 g/dl)
  • Age >18 years: 13.6 to 17.7 g/dl (mean 15.5 g/dl)

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