Fasting
Blood Tests for Intermittent Fasting: The Labs That Actually Matter
The core labs for intermittent fasters are A1C, fasting glucose, a lipid panel, vitamin D, vitamin B12, thyroid (TSH), and electrolytes, which come standard in a metabolic panel. A1C is the anchor test: it averages roughly three months of blood sugar, so it shows your trend instead of one morning's number. Most fasters do well with a baseline panel when they start, then a recheck every 6 to 12 months — sooner for any marker that came back out of range. You can order all of these online and walk into a local CLIA-certified lab, no doctor's visit or insurance required.
Oct 23, 2026
