Biochemistry Flashcards
Do you always need to test free T4 along with TSH to look for secondary hyperthyroidism?
No, it is too rare
What is the most common cause of secondary hypothyroidism?
Pituitary surgery
Does high prolactin make it impossible for someone to conceive?
No just decreases the chances
How are prolactin levels and the efficacy of antipsychotic drugs related?
Higher prolactin, higher efficacy (direct correlation)
What is the most common gene to be mutated in familial hypercholesterolaemia?
LDL receptor gene
Why are patients usually dehydrated in hypercalcaemia?
It interferes with the proximal tubular reabsorption of sodium
Name the 3 most common causes of potassium increase from most to least common
Haemolysis
Renal failure
Antihypertensive drugs e.g. spironolactone
What should you suspect if a patient has high potassium reading when taken at GP but normal when they have it done in hospital?
Pseudohyperkalaemia
