Referred to Antimicrobial Reference Laboratory, Dept of Microbiology, Southmead Hospital, Bristol BS10 5NB

Alternative names, keywords

Valaciclovir (prodrug form)

Samples required

Clotted blood (gold cap, 5 mL tube). Smaller tubes are available for paediatric samples.

Pre dose sample and post dose sample recommended (post dose = 1h after the end of iv administration or 2h after oral administration).

Test indications

May be of value in patients with renal failure and/or on ECMO, in cases of suspected neurotoxicity or suspected poor absorption, and in some patients receiving valaciclovir (prodrug form of aciclovir).

Reference range

Depends on dose regimen - interpretation is patient-specific. Discuss interpretation with Consultant Microbiologist.

Turnaround time

Referral lab quotes turnaround time of 1 working day, however additional time must be allowed for packing, dispatch and delivery of sample, and return and processing of results.


Biochemistry (Referrals)