The collective noun for cultures from different sites (blood, urine etc.)

What is the collective noun for microbiological cultures from different sites (blood, urine, feces etc.)? For example:

"Data on ___________ [cultures from different sites (blood, urine etc.)] were collected from the department of clinical microbiology."

You are most likely talking of specimens.

"Data on specimens was collected from the department of clinical microbiology."

M-W:

specimen noun
1 b : a portion or quantity of material for use in testing, examination, or study : a urine specimen

ODO:

specimen NOUN
1.2 A sample for medical testing, especially of urine.

‘Specimens of blood or urine are the alternatives…’