Procedure for Requesting Additional Blood Sciences (Biochemistry, Haematology and Immunology) Tests

Procedure for Requesting Additional Blood Sciences Tests

(Biochemistry, Haematology and Immunology)

We are aware that on occasion it is necessary to request additional tests for a sample already in the laboratory.

We will accommodate additional requests where possible, provided that:

  • The appropriate specimen type with sufficient sample remaining is available for the requested test.
  • The test does not require special specimen handling.

Contact Blood Sciences

  • Core Hours (Weekdays 8am – 10pm, weekends and Bank holidays 8am – 4pm) Call 0117 4148383 (ext. 48383), Select option 1
  • Out of Hours (All days 10pm – 8am, weekends and Bank Holidays 4pm – 10pm)

NOTE – Additional test requests out of hours should only be made if the results will affect immediate patient management.

  • Bleep the relevant department (this can be found in Test Information), Biochemistry (nos. 9436 or 9437) or Haematology (no. 9433).

To request an additional test, please provide following information:

  • Sample Number (available on ICE, instructions here- 
  • Name of patient
  • Tests to be added
  • Name and phone number of requestor

If the add-on test is urgent ensure this is communicated to the lab when requesting the add-on.

Guidelines for Additional Requests

Unstable! – add-ons are  NOT appropriate

Within 24 hours of venepuncture

Within 48 hours of venepuncture

Up to three days after


Coagulation (DIM, INR, CSC)

Haematology tests – FBC, RET, PV and GF.



CSF Lactate

Vitamin B12

Bone, Mg

Lactate (unless fluoride tube)

Troponin T



Anti-Mullerian Hormone

Malaria Parasites (include travel details)




Requests for Film Reviews (FR), IFAB and EPO are not to be requested on Winpath but should be noted on separate add-on sheet and passed to Haem who will process/DUF as appropriate.  Phone callers to be informed of this.




Conjugated/Direct Bilirubin


Cortisol, hCG, LDH, Lipids, 
Oestradiol, Paracetamol
Phenytoin, SHBG

C1 Esterase Inhibtor

Any Chemistry test that needs to be referred frozen      

Please note that requesting an additional test is not appropriate for Antimicrobial or Microbiology assays.

Procedure for Requesting Additional Blood Sciences (Biochemistry, Haematology and Immunology) Tests