Pharmacy/kidney tests

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dr simmons,i have written you before and always found you a pleasent and polite person.i have a question about kidneys.i know this is not in your field but maybe you know a nephrologist who i can ask question on line.i cant get a answer from all sources i tried.my problem is i am 79 and thr recommended guidelines say a man over 75 shouls not get a serum based gfr bec ause it is inaccurate due to muscle loss.o my gp gives me the not recommended serum creratinine gfr,i get serum creatinine 1.4 and gfr 49.he now wanta a 24 hour urine creatinine clearence.i wrote the top kidney doctor in countrty richard j glasscock.he said gfr 49 im 79 year old is normal/but i should take a cystatin c test which in mem 75 is most reliable.any info you can give would be appreciated.

Answer
Howard

Although I have worked for a renal products company in the past, I'm afraid I don't have access to a specialist nephrologist who could give a much better answer, with greater understanding.

I suggest you look at the following document:

www.kidney.org/professionals/tools/pdf/CystatinC.pdf

This has been published by the US, National Kidney Foundation and should give you a good explanation of Cystatin C testing. Hopefully it is not too technical.

I hope this helps.

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Nigel Simmons

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I am happy to answer general questions on medicines and hospital care. If possible, please use approved / chemical names rather than brands which are not internationally recognised. Like all health professionals I am bound by a duty of care which prevents me giving detailed information about medication or treatment of people other than the questioner. I will endeavour to help wherever possible or point towards more appropriate advice. If however your question crosses too far into patient confidentiality, I hope you will understand why I cannot answer your question. Consider.. would you want me to discuss your care with a friend or relative without your knowledge?

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