{"id":1429047,"date":"2022-09-06T10:54:58","date_gmt":"2022-09-06T08:54:58","guid":{"rendered":"https:\/\/staging-wp-int.laboklin.com\/products\/haematology-clin-chemistry-endocrinology\/endocrinology-tumour-markers\/t4-thyroxine\/"},"modified":"2025-11-20T10:00:27","modified_gmt":"2025-11-20T09:00:27","slug":"t4-thyroxine","status":"publish","type":"page","link":"https:\/\/laboklin.com\/no\/products\/haematology-clin-chemistry-endocrinology\/endocrinology-tumour-markers\/t4-thyroxine\/","title":{"rendered":"T4 (Thyroxine)"},"content":{"rendered":"

T4 (Total Thyroxine)<\/h3>

LABOKLIN Service ID: 137<\/span><\/p>


<\/p>
Material<\/strong><\/td>

serum or heparin plasma 0.5 ml resp. 0.4 ml (small mammals)<\/p><\/td><\/tr>

Method<\/strong><\/td>

CLIA<\/p><\/td><\/tr>

Duration<\/strong><\/td>

1 day<\/p><\/td><\/tr>

Remark<\/strong><\/td>

  • Canine:<\/strong> Most frequently used to diagnose hypothyroidism. Caution: A low T4 serum concentration is not necessarily associated with hypothyroidism. TSH is required for further assessment. In addition, rT3 can help differentiate non-thyroidal causes.<\/li>
  • Monitoring canine hypothyroidism:<\/strong> Blood sampling 4-6 hours after thyroxine administration. Monitor every 2-4 weeks until adequate control of hypothyroidism is achieved. Then every 3-6 months. Aim for a T4 concentration in the middle to upper reference range.<\/li>
  • Feline:<\/strong> Most frequently used to diagnose hyperthyroidism. Increased T4 serum concentrations indicate hyperthyroidism.<\/li>
  • Monitoring feline hyperthyroidism:<\/strong> Monitor every 2-4 weeks until euthyroidism is achieved. Then every 3-6 months. Aim for middle reference range. Very low T4 levels should be avoided.<\/li>
  • Birds and reptiles:<\/strong> Values are physiologically often very low below the detection limit of the test system used); in this case,determination of T4 (bird, reptil) (service 1089) is recommended. <\/li>
  • Horse:<\/strong> If (very rarely occurring) hypothyroidism is suspected, determination of T4 and T3 with a subsequent TRH stimulation test is recommended. <\/li><\/ul><\/p><\/td><\/tr><\/table>\n","protected":false},"excerpt":{"rendered":"

    T4 (Total Thyroxine)LABOKLIN Service ID: 137Materialserum or heparin plasma 0.5 ml resp. 0.4 ml (small mammals)MethodCLIADuration1 dayRemarkCanine: Most frequently used to diagnose hypothyroidism. Caution: A low T4 serum concentration is not necessarily associated with hypothyroidism. TSH is required for further assessment. In addition, rT3 can help differentiate non-thyroidal causes.Monitoring canine hypothyroidism: Blood sampling 4-6 hours…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1383158,"menu_order":14,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"class_list":["post-1429047","page","type-page","status-publish","hentry","description-off"],"_links":{"self":[{"href":"https:\/\/laboklin.com\/no\/wp-json\/wp\/v2\/pages\/1429047","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/laboklin.com\/no\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/laboklin.com\/no\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/laboklin.com\/no\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/laboklin.com\/no\/wp-json\/wp\/v2\/comments?post=1429047"}],"version-history":[{"count":1,"href":"https:\/\/laboklin.com\/no\/wp-json\/wp\/v2\/pages\/1429047\/revisions"}],"predecessor-version":[{"id":1537794,"href":"https:\/\/laboklin.com\/no\/wp-json\/wp\/v2\/pages\/1429047\/revisions\/1537794"}],"up":[{"embeddable":true,"href":"https:\/\/laboklin.com\/no\/wp-json\/wp\/v2\/pages\/1383158"}],"wp:attachment":[{"href":"https:\/\/laboklin.com\/no\/wp-json\/wp\/v2\/media?parent=1429047"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}