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Clinical Conditions

A number of common clinical conditions are known to influence laboratory results and may lead to confusion as to their degree of impact on interpretation. For certain conditions, such as pregnancy, menopausal status, and menstrual cycle, much has been studied and separate reference intervals have been established for a number of hormones. The ordering physician relies upon a comprehensive medical history when assessing such test outcomes.
For illnesses such as the common cold, seasonal flu, or other respiratory viral markers, dehydration may ensue and, as previously discussed, impart influence on measurands such as BUN and hemoglobin.