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Differential Diagnosis - Low TSH - Normal Serum Free T4 and T3 Levels

Purpose:

To explain the presence of a low serum TSH with normal free T4 and T3 hormone concentrations.

Specialty:

Endocrinology, Nutrition & Dermatology
Clinical Laboratory

Objective:

laboratory tests, differential diagnosis and mimics, red flags

ICD-10:

D35.2, E00-E07

Description:

In most patients a low thytrotopin (TSH) level is accompanied by elevated or depressed thyroid hormone levels. The presence of a low serum TSH level with normal free T3 and free T4 hormone levels can be seen in a number of conditions.

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