The phrase "a sample for an" is correct and usable in written English.
It can be used when referring to a specific type of sample intended for a particular purpose or audience.
Example: "We need to prepare a sample for an upcoming presentation to showcase our new product line."
Alternatives: "a specimen for a" or "an example for a".
Williams tweeted that, for the second time in a week, she was being asked to produce a sample for an anti-doping test.
However, the graft was completely pneumatized, with hard walls surrounding the void, mimicking the formation of an additional maxillary sinus within the existing one, but without any Schneiderian membrane which made it difficult for the collection of a sample for an histopathological differential diagnosis.
A sample for an out-of-competition drugs test that Chambers had provided in Germany on 1 August 2003 was re-examined in October and subsequently tested positive for banned substances.
The proposals would end the statute of limitations on many felonies and require every person convicted of a crime to provide a sample for a state database.
She had been detained for failing to provide a sample for a breath test after being found asleep in her car.
She had been detained for failing to provide a sample for a breath test after being found asleep in her car, but denied any wrongdoing.
We had ordered a chair seat from a supplier in Kentucky as a sample for a client with a very strict time deadline.
Mido was randomly selected to provide a sample for a drug test on Tuesday evening but rejoined his team-mates a little over two hours after the final whistle.
His brothers started a clothing factory, and Mr. Sauma made a sample for a plaid shirt that imitated what a Texas Ranger might wear.
Here, we introduce a new method for computing the stray field in a sample for a reduced model of ultra-thin film micromagnetics.
The auto upload function, probably the most important feature, worked flawlessly during my test (Cerevo gave me a sample for a few days).
