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TSH and Thyroid Tests: Reference Ranges Explained

Last updated: June 2026 - Reviewed by the Apexzen editorial team Part of: Blood Biomarkers Guide Key takeaways TSH (thyroid-stimulating hormone) is the main first-line blood test for thyroid function....

Vitamin B12 Deficiency: Signs and Optimal Levels

Last updated: June 2026 - Reviewed by the Apexzen editorial team Part of: Blood Biomarkers Guide Key takeaways Vitamin B12 is essential for nerve function and making red blood cells;...

HbA1c (A1c): What It Means and Your Target Range

Listen instead of reading -- Berberine and Blood Sugar: Who It Is For, and Who It Is Not (4 min) Last updated: June 2026 - Reviewed by the Apexzen editorial...

ALT Liver Enzyme: Normal Levels by Age

Last updated: June 2026 - Reviewed by the Apexzen editorial team Part of: Blood Biomarkers Guide Key takeaways ALT (alanine aminotransferase) is an enzyme found mainly in the liver; a...

Uric Acid: Normal Levels and What High Uric Acid Means

Last updated: June 2026 - Reviewed by the Apexzen editorial team Part of: Blood Biomarkers Guide Key takeaways A uric acid test measures a waste product made when your body...

eGFR: What Your Kidney Function Number Means

Last updated: June 2026 - Reviewed by the Apexzen editorial team Part of: Blood Biomarkers Guide Key takeaways eGFR (estimated glomerular filtration rate) estimates how well your kidneys filter waste...