| 2.2.4 Serum B12 and red cell folate testing
(1) Items 66599 and 66602 do not apply to more than 3 patient episodes that include a service mentioned in item 66599 or 66602, or any combination of those items, in a 12 month period.
(2) Item 66599 does not apply to a service mentioned in that item if the service was provided as part of the same patient episode as a service mentioned in item 66602.
2.2.5 Thyroid function testing
(1) For item 66719:
abnormal level of TSH means a level of TSH that is outside the normal reference range for the particular method of assay used to determine the level.
(2) Unless paragraph (a) of item 66719 is satisfied, the amount mentioned in the item is not payable for a pathology service mentioned in the item unless the pathologist who renders the service has a written statement from the medical practitioner who requested the service that satisfies subclause (3).
(3) The written statement from the medical practitioner must indicate:
(a) that the tests are required for a particular purpose, being a purpose mentioned in paragraph (b) of item 66719; or
(b) that the medical practitioner who requested the tests suspects the patient has pituitary dysfunction; or
(c) that the patient is on drugs that interfere with thyroid hormone metabolism or function.
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