Data entry

Physiological & Base Excess approach

PaCO₂(kPa)

pH

PaCO2 (mmHg)

Physicochemical approach (Stewart)

Strong cations

Na⁺ [137-145] mmol/L

K⁺ [3.5-4.6] mmol/L

Ca²⁺ [1.18-1.32] mmol/L

Mg²⁺ [0.7-1.10] mmol/L

Strong anions

Cl^- [98-106] mmoL/L

lactat^- [0.5-2.5] mmoL/L

Weak acids/anions/buffers

Albumin^- [36-45] g/L

Protein_tot^- [62-78] g/L

Pi^- [0.71-1.53] mmoL/L

Hb [7.3-9.5] mmoL/L

Hematocrit [40-50]

missing data?***

Mg²⁺missing Prot_tot^-missing

Pi^-missing Htc missing

Results

Physiological & Base Excess approach

[HCO₃^-](mEq/L)

sBE(mEq/L)

Anion Gap corrected

Delta Ratio not calculated

Expected compensation (Boston rules):

[HCO₃⁻] in normal range

PaCO₂ in normal range

PaCO₂ in normal range

Physicochemical approach^[1-3]

Model:

Constable (2003) Stewart, Figge, Matousek (1996, 2006, 2011)

Independent variables

PaCO₂(kPa)

A_tot(mmol/L)

Strong Ion Difference effective - SID_e(mEq/L)

Strong Ion Difference apparent - SID_a(mEq/L)

[H⁺] and pH from Stewart quartic equation

computed with SID_e

computed with SID_a

[H⁺](nEq/L)

pH

[H⁺](nEq/L)

pH

Unmeasured Ions Screening Tools

Strong Ion Gap - SIG (mEq/L)

Unmeasured Ion Excess - UIXecf (mEq/L)

sBE partition method

BEfw (mEq/L)

BEcl (mEq/L)

BEalb (mEq/L)

BExa (mEq/L)

Davenport Diagram

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