Adjust a Calculated Anion Gap for Serum Albumin

How to Use This Tool

Apply an editable albumin adjustment to an already calculated anion gap. Low albumin can lower the measured anion gap and hide part of the change clinicians are trying to interpret.

What Corrected Anion Gap actually establishes

Correction formulas are approximations and laboratory methods or clinical settings may use different factors. The page returns estimated albumin-corrected gap from the measurements named below; Corrected Anion Gap does not verify how they were collected or combine them with symptoms, examination findings and medical history.

Equation and input contract for Corrected Anion Gap

Corrected gap equals uncorrected gap + factor × max(0, 4.0 − albumin in g/dL). The required entries are Uncorrected anion gap, Serum albumin, Correction per 1 g/dL below 4; values should come from the same dated observation, specimen or record unless a label explicitly calls for different dates.

• For Corrected Anion Gap, Uncorrected anion gap uses the example 12 mmol/L; replace it with the value and unit from the same record.
• For Corrected Anion Gap, Serum albumin uses the example 2.8 g/dL; replace it with the value and unit from the same record.
• For Corrected Anion Gap, Correction per 1 g/dL below 4 uses the example 2.5 mmol/L; replace it with the value and unit from the same record.

Using estimated albumin-corrected gap safely

Keep the uncorrected gap, albumin, units and specimen time together and let a clinician interpret the acid-base picture. For Corrected Anion Gap, an unexpected answer should prompt a check of units, dates, transcription and the original measurement method. Do not adjust medicine, feeding, fluids, exercise, screening or treatment to make the result match an expected value.

The page-specific limit of Corrected Anion Gap

This page assumes g/dL albumin, uses an editable conventional factor and excludes potassium, pH, lactate and mixed disorders. Preserve that limitation with any saved estimated albumin-corrected gap. A reference interval or action threshold still depends on the patient, collection method, laboratory and clinical setting, none of which this arithmetic selects automatically.

Evidence reviewed for Corrected Anion Gap

The attached reference is NIH MedlinePlus — Anion gap blood test. It supports the equation, definition or measurement practice used for estimated albumin-corrected gap, while the original report and a licensed pediatrician, physician, pharmacist or other relevant professional remain authoritative for interpretation.

Emergency boundary

Do not use a calculator during a possible emergency. Severe breathing difficulty, blue or gray color, seizure, fainting, new confusion, stroke symptoms, inability to wake or rapid deterioration require urgent local medical help.

Privacy and repeatability for Corrected Anion Gap

Corrected Anion Gap runs in the current browser tab without requesting a name, login or medical-record connection. Keep identifying details out of the fields, preserve the original units and remember that extra decimal places cannot repair an uncertain measurement.