Let’s explore “Vitamin B1, whole blood TDP — lab reference”

Fasting and supplement abstention improve interpretability.

Recent supplementation can elevate; very high values may be clinically relevant.

Fasting, liver function, inflammation, and carrier proteins matter.

Interpret relative to lipids when appropriate; assay-specific.

Highly preanalytic-sensitive. Fasting, processing, and recent intake matter.

Your lab may use its own range. Symptoms, medicines, and the types of white blood cells also matter.

Altitude, smoking, hydration, androgen therapy, and pregnancy may shift values.

Protein intake, hydration, catabolism, GI bleeding, and kidney function affect result.

<150 supports deficiency; 150-400 is often treated as borderline and may warrant MMA/homocysteine review.

Ask your clinician to confirm with microscopy; exercise, menstruation, myoglobin, and hemolysis may interfere.

Ask your clinician to specify whole blood, RBC, plasma, or intracellular method. Preanalytic handling is critical.

Specimen choice, timing, recent seafood/supplements, provoked vs unprovoked collection, and public-health thresholds matter.