This is a correct and usable phrase in written English.
You can use it when you want to indicate that something can be used as and when necessary. For example: "We have a wide range of specialised tools available for use as required."
Any excess sample was snap-frozen in liquid nitrogen in single-use aliquots for use as required.
All patients (except for one) were receiving regular inhaled corticosteroids and β2 adrenoreceptor stimulants, for use as required.
Patients without clinical symptoms of hypocortisolaemia who did not reach a nadir of 100 nmol/dl were prescribed exogenous glucocorticoids at discharge from the hospital for use as required.
If you're happy with it, it's ready for use as required.
Finally, the sample was stored in a refrigerator (4 °C) for subsequent use as required.
The chi-square test for trend was used as required for variables that involved ordered categories.
To reduce preparation time, we preselect flies of the five different genotypes and sort them into centrifuge tubes which can be stored in the freezer for many months and used as required.
To fabricate the BG BC OFETs, non-birefringent plastic substrates coated with a transparent conducting oxide (TCO) were used as required for flexible display applications.
Only three questions (3, 14a, 14b) from the latter were used as required determinants for the Axis I diagnoses.
For real-time use, such as required to support video conferencing, best-effort service can result in unacceptable performance.
Intravenous opiates (morphine, pethidine) were used for analgesia as required, while sedation was achieved using midazolam and morphine infusions in appropriate doses as decided by the attending doctors and nurses.
