Purpose of the test
Liquid chromatography-tandem mass spectrometric monitoring of whole blood concentrations of sirolimus. Gold-standard assay for best management of dosage of Rapamune used in immunosuppression.
Please download the referrer notes below for further information.
Varies widely with indication and patient characteristics but usually within the range 4 - 12 µg/L.
For further advice: T 020 3299 3147
Pre-dose whole blood sample taken in EDTA (0.5mL minimum; 24h post-dose for once daily dosing).
Please submit with a request form showing the last dose, last dose time and sample time/date.
Storage and Transport
Sirolimus is stable in blood at normal ambient temperatures for several days. Ship adequately contained samples by 1st class mail or courier depending on urgency.
Send directly to:
Institute of Liver Studies,
King’s College Hospital,
London SE5 9RS
Same day Monday to Friday for samples received before 1.30 pm.
Time Limit for Extra Tests
Same day for other immunosuppressants eg. tacrolimus, ciclosporine or mycophenolate in the same sample.
Factors affecting results or interpretation
Interpretation is affected by indication for sirolimus, time from start of therapy, immunosuppressant comedication and patient’s clinical condition. Results vary during co-medication with inducers and inhibitors of cytochrome P450 3A and P-glycoprotein and with liver function (see Purpose of the Test).
T 020 3299 3147