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Laboratory unit conversion

Converts common biochemical tests between conventional mg/dL and International System units, for reading foreign papers and guidelines.

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Check the population, units and version. The result shows the formula or classification; it does not make an automatic treatment decision.

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Method · Limits of application

SI conversions/Young 1987: explicit molar masses and rounded factors; BUN≠urea

Select the analyte and unit: mass concentration and amount-of-substance concentration are different quantities, linked by the molar mass of the specified entity. Factors in this interface are rounded; triglycerides use a triolein basis. BUN expresses urea nitrogen rather than urea mass, so they are not interchangeable. Conversion does not change the laboratory method or establish a reference interval. The original Young 1987 tables have not been fully checked; certification of all factors by that source is not claimed.

Conditions of use

Check the population, units, inclusion and exclusion criteria, and version in the original source. A result alone does not establish a diagnosis, discharge decision or prescription.

Documented parameters

Examination
Convert
Value

7/7 reference cases checked. Numerical tests are not clinical validation.

Sources and documentation

Documented formula

Transcribed from the source or a recorded revision; this is not a clinical recommendation.

mmol/L = mg/dL × 10 ÷ molar mass; µmol/L = mg/dL × 10000 ÷ molar mass.

Glucose (180.16 g/mol): × 0.0555 · cholesterol (386.65): × 0.02586 · triglycerides (as triolein, 885.7): × 0.01129
Creatinine (113.12): × 88.4 µmol/L · uric acid (168.11): × 59.48 µmol/L · bilirubin (584.66): × 17.1 µmol/L
Urea (60.06): × 0.1665 · BUN (28 g nitrogen per mole of urea): × 0.357 mmol/L of urea · BUN = urea × 0.466 (urea = BUN × 2.14)
Calcium (40.08): × 0.2495

References

Identifier: conversao-de-unidades-laboratoriais

Original clinical content: Brazilian Portuguese.

Method version

SI conversions/Young 1987: explicit molar masses and rounded factors; BUN≠urea

conversao-de-unidades-laboratoriais@native-2026-10-05+5089b7084d55

Source for the active edition

The bibliographic edition identifies the source. By itself, it proves neither full conformity of the formula nor clinical approval.

Synthetic cases checked (7)

Synthetic cases for checking the implementation, with no patient data.

Case 1

reference-001

Inputs

Examination: Glucose
Convert: From mg/dL to SI units
Value: 100

{
  "an": "glicose",
  "dir": "si",
  "val": 100
}

Expected result

{
  "out": 5.551
}

Actual result

{
  "out": 5.550621669626999
}

Case 2

reference-002

Inputs

Examination: Creatinine
Convert: From mg/dL to SI units
Value: 1

{
  "an": "creatinina",
  "dir": "si",
  "val": 1
}

Expected result

{
  "out": 88.4
}

Actual result

{
  "out": 88.4016973125884
}

Case 3

reference-003

Inputs

Examination: Cholesterol (total, HDL, LDL)
Convert: From SI units to mg/dL
Value: 5

{
  "an": "colesterol",
  "dir": "conv",
  "val": 5
}

Expected result

{
  "out": 193.33
}

Actual result

{
  "out": 193.325
}

Case 4

reference-004

Inputs

Examination: Urea
Convert: From mg/dL to SI units
Value: 40

{
  "an": "ureia",
  "dir": "si",
  "val": 40
}

Expected result

{
  "out": 6.66,
  "bun": 18.657
}

Actual result

{
  "out": 6.66000666000666,
  "bun": 18.657342657342657
}

Case 5

reference-005

Inputs

Examination: BUN (blood urea nitrogen)
Convert: From mg/dL to SI units
Value: 20

{
  "an": "bun",
  "dir": "si",
  "val": 20
}

Expected result

{
  "out": 7.139,
  "ureia": 42.88
}

Actual result

{
  "out": 7.139287499107589,
  "ureia": 42.87856071964018
}

Case 6

reference-006

Inputs

Examination: Bilirubin
Convert: From SI units to mg/dL
Value: 17.1

{
  "an": "bilirrubina",
  "dir": "conv",
  "val": 17.1
}

Expected result

{
  "out": 1
}

Actual result

{
  "out": 0.9997686
}

Case 7

reference-007

Inputs

Examination: Total calcium
Convert: From mg/dL to SI units
Value: 10

{
  "an": "calcio",
  "dir": "si",
  "val": 10
}

Expected result

{
  "out": 2.495
}

Actual result

{
  "out": 2.4950099800399204
}

Code and reproducibility

This tool’s code on GitHub

Download code and tests

Sources, version and reproduction instructions

README

Local installation

Code license: Apache-2.0

Guidelines and conditions

This repository’s license applies to the code. Third-party instruments, questionnaires, data and models remain subject to their owners’ conditions.

The code tests are technical checks. Clinical approval and professional translation review are recorded separately.

Relationship with cancer research

General context — relationship to be defined

A resource for general clinical contexts. This edition does not assign a specific oncological relationship; selecting it for a study requires a justified question, population and purpose.