Evaluation of Chloride Disorders

Last updated: April 6, 2026, 6:50 PM Pacific Time (PDT)

Shared bedside framework for hyperchloremia and hypochloremia. Choose whether the main chloride problem is hyper or hypo, then use the adaptive assistant to focus on acid-base context, gastric or enteric losses, renal handling, and iatrogenic drivers without clicking into separate pages.

Interactive diagnostic assistant

Activate the assistant to adapt the page to either hyperchloremia or hypochloremia and re-rank likely mechanisms from entered data.

Chloride pattern Hyperchloremia present Hypochloremia present

Chloride (mEq/L, ref about 98-106)

History and bedside clues

ICU, major fluid shifts, or aggressive inpatient resuscitation AKI, CKD, or major renal-handling concern Rapidly changing chemistry or evolving mixed disorder

Other labs

Core labs

Sodium (mEq/L, ref about 135-145)
Bicarbonate / CO2 (mEq/L, ref about 22-28)
Anion gap (mEq/L, ref about 8-12)
Potassium (mEq/L, ref about 3.5-5.0)
Creatinine (mg/dL, ref about 0.6-1.3)

Optional labs

pH (ref about 7.35-7.45)
Urine chloride (mEq/L)
Urine pH
Magnesium (mg/dL, ref about 1.7-2.2)

Free-text lab entries are interpreted automatically when they look low, normal, high, acidemic, alkalemic, or clearly abnormal.

Likely mechanisms

Likely diagnoses from entered data

This is a simplified teaching assistant for bedside chloride reasoning. It supports incomplete data, but the acid-base context and treatment trajectory still matter more than a chloride value in isolation.

Flowchart

Step 1

Name the direction and context of the chloride abnormality

Before subtype workup, decide whether this is high chloride, low chloride, or an evolving mixed chemistry picture, then ask whether the bicarbonate and pH make it clinically meaningful.

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Step 2

Use shared anchors

Sodium, bicarbonate, potassium, creatinine, and urine chloride help you avoid over-anchoring on the chloride number alone.

Hyperchloremia branch

Acid-base

Hyperchloremic metabolic acidosis versus simple chloride concentration

Low bicarbonate changes the frame and points toward GI bicarbonate loss, RTA, or reduced renal acid excretion.

Iatrogenic / water balance

Chloride-rich fluids, dehydration, or resolving mixed disorders

Saline exposure and free-water deficit remain common inpatient explanations.

Hypochloremia branch

Metabolic alkalosis

Vomiting, gastric suction, or diuretic-associated chloride depletion

Low chloride often travels with contraction alkalosis and volume-responsive physiology.

Renal / endocrine

Mineralocorticoid excess, ongoing diuretic effect, or salt-wasting processes

Urine chloride helps separate chloride-responsive from chloride-resistant alkalosis.

Teaching pearl: chloride disorders are usually acid-base or volume stories. The value matters most when it fits the bicarbonate, potassium, urine chloride, and bedside trajectory.