Drugs & toxicology

Isoniazid (post-dose) unit converter

Isoniazid level in serum or plasma (drug monitoring; tuberkulose)

Converter

Enter a value in any unit and all other units fill in.

µg/mL µmol/L mg/dL µg/dL µg/L

Worked example

4 µg/mL (middle of the reference range) = 29.2 µmol/L

Conversion formulas

µmol/L	µmol/L = µg/mL × 7.292	µg/mL = µmol/L × 0.1371
mg/dL	mg/dL = µg/mL × 0.1	µg/mL = mg/dL × 10
µg/dL	µg/dL = µg/mL × 100	µg/mL = µg/dL × 0.01
µg/L	µg/L = µg/mL × 1000	µg/mL = µg/L × 0.001

Good to know

Isoniazid (post-dose) is reported in µg/mL or µmol/L. The page converts between the units only.

µmol/L × 0.1371 = µg/mL (exact factor 0.1371).
The range shown is a guide from the named source; targets and reference ranges differ between laboratories, methods and indications, so compare with the range on your own report.

Reference range

Unit	Adults
µg/mL	3 – 5
µmol/L	21.88 – 36.46
mg/dL	0.3 – 0.5
µg/dL	300 – 500
µg/L	3000 – 5000

Source: Severn Pathology (North Bristol NHS Trust): Isoniazid and N-acetyl isoniazid · Last reviewed: 2026-10-19

Note from the source: Post-dose 3.0-5.0 mg/L (Severn Pathology).

Frequently asked questions

How do I convert Isoniazid (post-dose) from µg/mL to mg/dL?

mg/dL = µg/mL × 0.1. In the other direction: µg/mL = mg/dL × 10.

What is the reference range of Isoniazid (post-dose)?

For adults the range is 3 – 5 µg/mL (Severn Pathology (North Bristol NHS Trust): Isoniazid and N-acetyl isoniazid). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Isoniazid (post-dose)?

Common units are µg/mL, µmol/L, mg/dL, µg/dL, µg/L.