For Kellie et al-converting spot urine Na and K and creatinine to 24 hr numbers.

[Guest guest]

First you need at least one good 24 hr urine collection to get an

estimate of how much creatinine your body produces each day. All that

is produced goes out in the urine (mostly).

So you had a 24 hr urine that was 1.53 grams per 24 hrs. Assuming

this was a good 24 hr urine.

Defined by:

1. at say 8 am in morning You peed and threw that out.

2. You started timing the 24 hr urine.

3. You put every drop into the collection jug.

4. You peed exactly at 24 hrs after 2.

So lets say each day you pee out 1.53 gms of creatinine.

Ecr = 1.53 gm/24 hr = 1,530 mg/24 hr

So you collect a spot urine at the next Dr. visit.

1. Write down the time you pee before you go to the Dr and pee.

2. If you can do not pee until you get to the Dr and are given the

sample bottle to pee in. Ask the that be bottle be big enough to

collect all your pee since you last peed. Recored the time you peed

for this.

So now you have the following info

Urine collected for say 3 hours

Volume was 300 cc.

HypotheticalSo lets say the spot urine comes back

25 mM Na/L and 16 K mM/L and creatinine was 100 mg% in the 300 cc.

What is % of 24 hr creatinine collected during 3 hours = 300 cc

urine x 100 mg creatinine/100 cc urine x 1/1530 mg creatinine/24 hr.

= 300/1530 = 19.6% of 24 hr creatinine in this urine

collection.

25 mM Na/L x 1/.196 = 126 mM Na/24 hr.

16 mM K/l x 1/.196 = 82 mM K/24 hr.

You also know you are not DASHing to the max because there is not

more K in the urine than Na.

That is if I have all my decimals and conversions correct.

Some one please double check.

May your salt intake and pressure be low!

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