Notes

Reference material on the arithmetic and the instrument. All of it is about measurement — none of it is about what to measure.

• 1 August 2026 · 7 min How to read an insulin syringe What U-100 means, how 30, 50 and 100 unit barrels differ, exactly where on the stopper to read, and the five misreadings that are systematic rather than random.
• 1 August 2026 · 6 min mcg, mg, mL and units Two of them measure mass and two measure volume. Why there is no direct mg-to-units conversion, and how concentration bridges the two, with reference tables.
• 1 August 2026 · 6 min How much bacteriostatic water to add There is no correct answer, because the volume does not change what you have. How to pick one that makes the number readable, and how to solve backwards from a target draw.
• 1 August 2026 · 8 min Five reconstitution examples, worked start to finish 2 mg through 30 mg vials, every intermediate number shown, plus one combination that produces an unreadable draw and what to do about it.

The tool itself Peptide reconstitution calculator Vial size, water and dose in; millilitres, syringe units and a to-scale barrel out.