Occupational health services.

Abstract

This procedure would have two advan- tages.The first is that it would overcome many of the administrative difficulties, both on the ward and in the laboratory, which arise from the necessity of sending a plasma sample and request card to the laboratory on one day and the 24-hour urine sample with a second request card on the following day.If the plasma is taken when the collec- tion is completed, both specimens can be sent with a single request card.The second, perhaps less important, advantage is that with this procedure the change in creatinine clearance will be greater than with the conventional method should the plasma creatinine be rising or falling during the period of the urine collection.For example, if renal function were deteriorating and plasma creatinine rising the creatinine clear- ance would be lower if the plasma is taken at the end of the urine collection than if it is taken in the middle.There is no doubt that clinical biochemistry laboratories would welcome this change in procedure, and it appears to have no clinical disadvantages.-Weare, etc.,