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Serum Minus Ascites Albumin Difference

Subtract ascitic albumin from serum albumin in matching concentration units.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Health results are educational estimates, not a diagnosis or treatment recommendation. A qualified clinician can interpret measurements in the context of your health.

Formula and method

Serum albumin 3.5 g/dL minus ascitic albumin 1.5 g/dL gives a gradient of 2 g/dL.

SAAG = serum albumin − ascitic albumin.

Worked example

Enter these known values and leave the other values blank.

Serum albumin concentration
3.5 g/dL
Ascitic fluid albumin concentration
1.5 g/dL
Serum-ascites albumin gradient
2 g/dL

Assumptions and limitations

  • Use serum and ascitic fluid albumin sampled in the same clinical assessment. Negative and zero differences are arithmetically possible. This tool reports the difference without classifying its cause.
  • Use the displayed units and measurements from the same context. Editable fields support arithmetic inverses when enough independent values are supplied. Clear a preset value before solving it as an unknown.
  • This tool performs the stated arithmetic model. It does not establish a diagnosis, prescribe treatment or replace laboratory and clinical assessment.

Common questions

What does this calculation represent?

Use serum and ascitic fluid albumin sampled in the same clinical assessment. Negative and zero differences are arithmetically possible. This tool reports the difference without classifying its cause.

Can I solve for a different field?

Clear the unknown field and enter enough independent values in the remaining editable controls. A relationship cannot recover a unique value when a dividing quantity is zero.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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