gfr blood test uk

[rosie97]

hi, can anybody help. Before blood test do we need to fast or drink? Can anybody explain how it makes a difference. My gfr has been dropping for the past 3 months (now 48 ). I want to get as true a reading as I can. Thanks

[userotc]

Ideally the test provider should advise but generally it is advisable to be hydrated and, at least, avoid meat and fish if not fully fasted. See 2 links below - I also have a paper from a medic entitled "Effect of dehydration on blood tests" who states:

"Before routine blood tests, patients should avoid unnecessary physical activity, avoid hot dry environments, ensure adequate intake of water, and avoid diuretic substances such as caffein".

labtestsonline.org.uk/tests...

testing.com/tests/estimated...

[rosie97 in reply to userotc]

thank you for the links. Will read them now.

[Bassetmommer]

Before labs, you should be drinking water and some say between 64-72 ounces a day, especially the week of the lab. The day of the lab, a little water but not too much, and no food for 8 hours before. Better to fast overnight. But have some water, no coffee or tea, 8 to12 ounces before the lab.

[rosie97 in reply to Bassetmommer]

thanks for the advice