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Tag: biotin interference

September 19, 2026

High and Low TSH Levels: How to Interpret TSH Test Results

Why TSH should be interpreted with Free T4, selective T3 testing, thyroid antibodies, symptoms, medications, pregnancy status, and trends.

High and low TSH levels are signals to interpret with Free T4 and the clinical setting. High TSH commonly accompanies insufficient thyroid hormone production; low TSH commonly accompanies thyroid-hormone excess. Pregnancy, pituitary disease, medicines, acute […]

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August 27, 2026

Troponin I vs. Troponin T: Results and Serial Change

How assay-specific limits, serial trends, kidney function, and clinical evidence turn a troponin result into meaningful context.

Troponin I and troponin T are different cardiac proteins measured with different laboratory assays. Both can show myocardial injury, but their numbers, units, reference limits, and changes over time are assay-specific. A high result does […]

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August 4, 2026

Hashimoto’s Thyroiditis: Reading TSH, Free T4, TPO, and Thyroglobulin Antibodies as One Pattern

Thyroid antibodies help explain the autoimmune cause; TSH and Free T4 show what the thyroid is doing now.

Hashimoto’s thyroiditis testing should answer two different questions. First, is an autoimmune process affecting the thyroid? Thyroid Peroxidase Antibodies (TPO) Test and Thyroglobulin Antibodies (TgAb) Test help address that question. Second, is the thyroid currently […]

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