Med Lab Facts - Note sequence of testing: 🥇TSH → 🥈FT4 → 🥉FT3 🤸OPPOSITE: TSH and Thyroid Function (Except in Secondary Hyper/Hypo) #Low TSH= expect #HYPER thyroidism, increased FT4 *if normal FT4,
![Value of the fT3/fT4 ratio and its combination with the GRACE risk score in predicting the prognosis in euthyroid patients with acute myocardial infarction undergoing percutaneous coronary intervention: a prospective cohort study Value of the fT3/fT4 ratio and its combination with the GRACE risk score in predicting the prognosis in euthyroid patients with acute myocardial infarction undergoing percutaneous coronary intervention: a prospective cohort study](https://media.springernature.com/m685/springer-static/image/art%3A10.1186%2Fs12872-018-0916-z/MediaObjects/12872_2018_916_Fig2_HTML.png)
Value of the fT3/fT4 ratio and its combination with the GRACE risk score in predicting the prognosis in euthyroid patients with acute myocardial infarction undergoing percutaneous coronary intervention: a prospective cohort study
![Frontiers | FT3/FT4 ratio is correlated with all-cause mortality, cardiovascular mortality, and cardiovascular disease risk: NHANES 2007-2012 Frontiers | FT3/FT4 ratio is correlated with all-cause mortality, cardiovascular mortality, and cardiovascular disease risk: NHANES 2007-2012](https://www.frontiersin.org/files/Articles/964822/fendo-13-964822-HTML/image_m/fendo-13-964822-g001.jpg)
Frontiers | FT3/FT4 ratio is correlated with all-cause mortality, cardiovascular mortality, and cardiovascular disease risk: NHANES 2007-2012
![Table 1 from Comparison of FT3, FT4 and TSH levels in Pregnant Women in Dehradun, India | Semantic Scholar Table 1 from Comparison of FT3, FT4 and TSH levels in Pregnant Women in Dehradun, India | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/432d9a9749e1ca9f9ad1dfc3f7c199432d9201df/2-Table1-1.png)