For Fasting Blood Sugar
Need 8-12 hours fasting.
Can have liberal water intake.
Cannot consume plain tea, plain coffee etc.
Should take the night doses of the hypoglycemic drugs you are currently on and do not take the morning doses of the hypoglycemic drugs. (Can cause hypoglycemia)
For Lipid Profile
For fasting lipid profile need 14 hour fasting.
Take lipid lowering drugs on the previous night.
Can have liberal water intake.
Cannot consume plain tea, plain coffee etc.
For TSH and Free T4 testing
Fasting is preferred.
Do not take the morning Thyroxine dose.
Avoid the test when having an acute illness.
For Iron studies
Samples should be collected in the morning.
Fasting is preferred.
Need to omit morning doses of iron supplements.
Avoid the test when having an acute illness.
Tests which needs compulsory fasting
TESTOSTERONE, PROLACTIN, CORTISOL
Samples are collected at 9.00am
Need 6 hours fasting.