Indigokarmijn Serb (Indigo Carmine)

Indigo Carmine is employed as a diagnostic dye for renal and urinary‑tract assessments.

• Renal plasma flow measurement: provides a visual marker to calculate renal plasma flow during clearance studies.
• Intra‑operative urinary‑tract visualization: highlights ureters and bladder during surgery to prevent injury.
• Detection of urinary‑tract leaks: used intra‑operatively to identify leaks or fistulas by tracing dye excretion.
• Ophthalmic staining: applied to corneal lesions to enhance visualization during eye examinations.

• Indigo Carmine acts as a water‑soluble, anionic dye that remains largely unchanged after intravenous administration. It is rapidly distributed in the extracellular fluid and is filtered by the glomeruli without tubular secretion or reabsorption. The resulting blue coloration of urine allows clinicians to track renal excretion and to delineate urinary‑tract anatomy during diagnostic or surgical procedures.

Adverse reactions to Indigo Carmine may range from mild to severe and should be monitored during and after administration.

Common Side Effects

• Transient hypotension: brief drop in blood pressure shortly after injection.
• Nausea or vomiting: mild gastrointestinal upset.
• Flushing or warmth: sensation of heat or redness at the injection site.
• Headache: mild to moderate headache.
• Metallic taste: temporary alteration in taste perception.

Serious or Rare Side Effects

• Anaphylactic reaction: severe allergic response requiring immediate medical intervention.
• Methemoglobinemia: rare oxidation of hemoglobin reducing oxygen delivery.
• Hemolysis: destruction of red blood cells in susceptible individuals.
• Severe hypertension: abrupt increase in blood pressure.
• Cardiac arrhythmia: irregular heart rhythm in vulnerable patients.

When using Indigo Carmine, consider the following precautions to ensure patient safety.

• Allergy assessment: verify no known hypersensitivity to indigo dyes or related compounds.
• Renal function: evaluate kidney function, as impaired clearance may increase exposure.
• Cardiovascular monitoring: observe blood pressure and heart rate during administration.
• Pregnancy and lactation: use only if the potential benefit justifies the potential risk to the fetus or infant.
• Concomitant dyes: avoid simultaneous use of other colored agents that may interfere with diagnostic interpretation.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Indigo Carmine may interact with other substances, affecting its safety or diagnostic utility.

Major Interactions (Avoid)

• MAO inhibitors: potential for hypertensive crisis when combined with certain vasoconstrictive agents.
• Other intravenous dyes: may cause additive discoloration and interfere with laboratory measurements.

Moderate Interactions (Monitor Closely)

• Pulse oximetry: dye can cause false low oxygen saturation readings.
• Laboratory assays: may interfere with colorimetric tests such as creatinine or bilirubin assays.
• Antihypertensive drugs: monitor blood pressure as dye‑induced hypotension may be potentiated.
• Diuretics: increased renal excretion may alter dye kinetics.
• Contrast media: assess cumulative dye load to avoid renal stress.