N-methylhistamine/creatinine in urine

Indications

• evaluation of anaphylaxis

Clinical significance

• remains elevated in urine for many hours after anaphylaxis
• reflects overall levels of released histamine

Specimen

• 24 hour urine preferred

More general terms

• urine creatinine ratio

Additional terms

• N-methylhistamine

Components

• N-methylhistamine in urine
• creatinine in urine